Long-term stability of the oxygen pulse curve during maximal exercise

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Data are presented as means and standard deviations (bars). One trial was carbohydrate supplemented (CHO), and the other was a placebo trial (PLA). Half of the participants had correct cognitive awareness of the supplementation type (correct) while the other half believed they were receiving the opposite supplementation (incorrect). * indicates significant increase with exercise compared to the resting condition (P<0.01)." ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "James Wilfred Navalta, Brian Keith McFarlin, Scott Lyons, Scott Wesley Arnett, Mark Anthony Schafer" "autores" => array:5 [ 0 => array:2 [ "nombre" => "James Wilfred" "apellidos" => "Navalta" ] 1 => array:2 [ "nombre" => "Brian Keith" "apellidos" => "McFarlin" ] 2 => array:2 [ "nombre" => "Scott" "apellidos" => "Lyons" ] 3 => array:2 [ "nombre" => "Scott Wesley" "apellidos" => "Arnett" ] 4 => array:2 [ "nombre" => "Mark Anthony" "apellidos" => "Schafer" ] ] ] ] ] "idiomaDefecto" => "en" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1807593222015150?idApp=UINPBA00004N" "url" => "/18075932/0000006600000002/v1_202212010821/S1807593222015150/v1_202212010821/en/main.assets" ] "en" => array:19 [ "idiomaDefecto" => true "cabecera" => "CLINICAL SCIENCE" "titulo" => "Long-term stability of the oxygen pulse curve during maximal exercise" "tieneTextoCompleto" => true "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "203" "paginaFinal" => "209" ] ] "autores" => array:1 [ 0 => array:4 [ "autoresLista" => "Ricardo Brandão Oliveira, Jonathan Myers, Claudio Gil Soares de Araújo" "autores" => array:3 [ 0 => array:4 [ "nombre" => "Ricardo Brandão" "apellidos" => "Oliveira" "email" => array:1 [ 0 => "ricardobrandaorj@gmail.com" ] "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "I" "identificador" => "aff1-cln_66p203" ] 1 => array:2 [ "etiqueta" => "*" "identificador" => "cor1" ] ] ] 1 => array:3 [ "nombre" => "Jonathan" "apellidos" => "Myers" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "II" "identificador" => "aff2-cln_66p203" ] ] ] 2 => array:3 [ "nombre" => "Claudio Gil Soares" "apellidos" => "de Araújo" "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "I" "identificador" => "aff1-cln_66p203" ] 1 => array:2 [ "etiqueta" => "III" "identificador" => "aff3-cln_66p203" ] ] ] ] "afiliaciones" => array:3 [ 0 => array:3 [ "entidad" => "Gama Filho University Exercise Physiology, Rio de Janeiro, Rio de Janeiro, Brazil." "etiqueta" => "I" "identificador" => "aff1-cln_66p203" ] 1 => array:3 [ "entidad" => "Division of Cardiovascular Medicine, Stanford University and Veterans Affairs Palo Alto Health Care System, Palo Alto, USA." "etiqueta" => "II" "identificador" => "aff2-cln_66p203" ] 2 => array:3 [ "entidad" => "Clinimex Clnica de Medicina do Exerccio, Rio de Janeiro, Brazil." "etiqueta" => "III" "identificador" => "aff3-cln_66p203" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor1" "etiqueta" => "*" "correspondencia" => "Tel.: 55 21 2256-7183" ] ] ] ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig1" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 261 "Ancho" => 420 "Tamanyo" => 18743 ] ] "descripcion" => array:1 [ "en" => "First and second quintiles of relative O2 pulse during CPX. Triangles (▴) stand for results obtained in the first CPX. Closed circles (•) stand for results obtained in the second CPX. The vertical line highlights the linearity of the curves after exclusion of the first 10% of the CPX time. All results of relative O2 pulse were multiplied by 100. The exercise responses and slopes for each quintile are shown in <a class="elsevierStyleCrossRefs" href="#tbl3">tables 3 and 4</a>. Q, quintiles; CPX, cardiopulmonary exercise testing. No significant differences were found when both CPX in each quintile were compared (p>0.05 for all comparisons)." ] ] ] "textoCompleto" => "INTRODUCTIONThe stroke volume (SV) response to exercise is considered one of the most important indices of heart function.<a class="elsevierStyleCrossRef" href="#bib1">1</a> Unfortunately, its direct measurement during exercise requires intravascular catheterization, and therefore is rarely performed in the clinical setting. Consequently, several noninvasive methods to estimate exercise SV have been developed.<a class="elsevierStyleCrossRef" href="#bib2">2</a> Recently, attention has been given to the oxygen pulse (O2 pulse), a readily available variable obtained during cardiopulmonary exercise testing (CPX), calculated by the ratio of oxygen uptake (VO2) and heart rate (HR). The O2 pulse has been demonstrated to be a powerful predictor of mortality in patients with cardiovascular diseases<a class="elsevierStyleCrossRefs" href="#bib3">3,4</a> and it has been associated to the onset of exercise-induced ischemia.<a class="elsevierStyleCrossRefs" href="#bib5">5,6</a> Although clinically useful, the O2 pulse is not a simple variable to consider, since it is influenced by many factors that can confound its interpretation, including the presence of diastolic dysfunction,<a class="elsevierStyleCrossRef" href="#bib7">7</a> valvular regurgitation,<a class="elsevierStyleCrossRef" href="#bib8">8</a> fitness level (athletes may exhibit a plateau in oxygen pulse at higher levels of exercise, likely reflecting a physiological limitation of SV at the upper limits of HR),<a class="elsevierStyleCrossRef" href="#bib9">9</a> testing protocol<a class="elsevierStyleCrossRef" href="#bib10">10</a> and body dimensions.<a class="elsevierStyleCrossRef" href="#bib11">11</a>Rearranging the terms in the modified Fick equation, we have; VO2/HR  =  (CO × CaO2)/HR – (CO × CvO2)/HR, where CO is cardiac output and CaO2 and CvO2 are the arterial and mixed venous O2 contents, respectively. Whipp et al.<a class="elsevierStyleCrossRef" href="#bib11">11</a> postulated that O2 pulse, when plotted as a function of 1/HR, results in a linear relationship that extrapolates to the asymptotic O2 pulse. In other words, during progressive exercise, when VO2 changes as a linear function of HR, the O2 pulse equals the slope of the VO2-HR relationship. This relationship only holds true however, if it is assumed that the product of CO and CvO2 is constant during steady-state work rates as seen in graded exercise testing protocols (e.g.: Bruce protocol) and also that CaO2 is normally constant during exercise. To our knowledge, the O2 pulse curve pattern during the now-commonly used non-steady-state (ramp protocol) incremental exercise test has not been well described.In addition, since SV is directly influenced by body dimensions<a class="elsevierStyleCrossRefs" href="#bib12">12,13</a> and O2 pulse is related to the SV response to exercise, adjustments for body dimensions or weight should be included in studies aiming to evaluate the O2 pulse response to exercise. If only maximal values are considered, overweight or obese subjects would have a superior O2 pulse response, which is likely misleading considering the higher prevalence of cardiovascular disease in this particular group. This aspect has been an important limitation of both clinical<a class="elsevierStyleCrossRefs" href="#bib6">6,14</a> and physiological studies<a class="elsevierStyleCrossRefs" href="#bib15">15,16</a> and requires further exploration.In the present study, we tested the hypothesis that O2 pulse corrected for body weight (hereafter termed relative O2 pulse) in response to non-steady-state incremental exercise testing demonstrates a linear pattern in a well controlled data set of subjects referred for exercise testing at our institution. In addition, we tested the hypothesis that the relative O2 pulse curve pattern during progressive exercise, expressed by its slope and intercept, remains stable during serial testing under the same clinical conditions and similar drug regimens.MATERIALS AND METHODSStudy PopulationWe retrospectively studied a sample consisting of 502 adult non-athletes referred, at least twice, for exercise testing for clinical and/or exercise pre-participation reasons at our clinic from January 02, 2001 to October 31 2009. The study was designed to conform to the Declaration of Helsinki and approved by the Institutional Ethics Committee. Inclusion criteria consisted of patients who: a) performed two maximal cycling ramp protocol CPX at least 3 months apart; b) did not change clinical status and regular use of medications that might have affected the cardiovascular response to exercise (such as beta-blockers) at both CPXs. Subjects with valvular heart disease, lung disease, anemia and those who exhibited O2 desaturation (more than 4% at maximal effort) during exercise were excluded from the study. In addition, all CPXs stopped early for clinical indications were not considered maximal and were excluded. After applying all inclusion and exclusion criteria, 100 subjects were considered for final analyses (80 men), of whom 50% had coronary artery disease. Baseline clinical characteristics are shown in <a class="elsevierStyleCrossRef" href="#tbl1">Table 1</a>. After undergoing the first CPX, 75% of the subjects attended a supervised exercise program at our clinic at least three times a week, while the remaining 25% received advice regarding exercise.<elsevierMultimedia ident="tbl1"></elsevierMultimedia>Cardiopulmonary Exercise Testing (CPX)After providing written informed consent, all subjects underwent a symptom-limited CPX using an electronically-braked cycle ergometer (EC-1600; Cat Eye;, Japan or CG-04, Inbrasport, Brazil), according to an individualized ramp protocol designed to allow patients to reach maximum exercise within the desirable range of 8 to 12 minutes.<a class="elsevierStyleCrossRefs" href="#bib17">17,18</a> The patients were verbally encouraged to exercise to volitional fatigue, regardless the maximal HR attained. No medications were stopped before the CPX. The electrocardiogram (ECG) (Cardiolife TEC 7100; Nihon-Kohden, Japan; or Elite Ergo PC 3.2.1.5; Micromed, Brazil) was continuously monitored via a single lead (CC5 or CM5). Ventilatory expired gas analysis was obtained by a metabolic system (VO2000; MedGraphics, US). The air flow and oxygen and carbon dioxide sensors were calibrated before each test using 2-liter syringes and gases with known volumes of oxygen, nitrogen, and carbon dioxide concentrations. No test results were classified as indeterminate. All exercise tests were performed, analyzed and reported according to a standardized protocol by a single experienced physician.Hemodynamic and Ventilatory AssessmentsThe HR was analyzed beat-by-beat and expressed every 10-s. Maximum HR was considered as the highest 10-s average obtained during the CPX. The age-predicted maximum HR was also calculated by the equation [210-(0.65 × age)]. <a class="elsevierStyleCrossRef" href="#bib19">19</a> Expired ventilatory data were analyzed and expressed at each 10-s. Maximum VO2 (VO2max) was expressed as the highest 60-s average value obtained during the CPX. The age-predicted VO2max was also calculated according to standard equations. <a class="elsevierStyleCrossRef" href="#bib19">19</a> Delta VO2/workload was calculated as: VO2max – resting VO2 divided by maximum workload and expressed in mL.min-1.watts-1. For practical purposes, the resting VO2 while sitting on the cycle ergometer was considered to be 3.5 mL.kg-1.min-1 for all subjects. O2 pulse was calculated by dividing VO2 by HR obtained every 10-s during CPX. Maximum O2 pulse was expressed as the highest 60-s average value and was expressed in milliliters per beat. In addition, this value was expressed as a percentage of age-predicted achieved, which corresponds to the ratio between the predicted values for maximum VO2 and maximum HR. In order to remove the influence of body weight on the magnitude of O2 pulse response during CPX, its values were then divided by weight in kilograms (relative O2 pulse). In order to make the mathematical manipulations of the study easier, all results related to the relative O2 pulse were multiplied by 100.Data management and statistical analysesOne of the strategies for testing our hypothesis was to divide the sample into quintiles, according to the results of maximum relative O2 pulse obtained during the first CPX. Dividing the sample by quintiles allowed us to compare the stability of relative O2 pulse in subjects with different fitness levels and values of maximum relative O2 pulse. Paired students t-tests were used to assess the differences for key variables between the first and second CPX, when comparisons were made for the entire sample. A χ2 statistics was used for comparisons of categorical variables among quintiles of relative O2 pulse. For comparisons made on key variables among quintiles of maximum relative O2 pulse, a repeated-measures two-way ANOVA with Greenhouse-Geisser correction <a class="elsevierStyleCrossRef" href="#bib20">20</a> was performed, in which CPX (i.e., first versus second CPX) and quintiles of maximum relative O2 were the main factors. After excluding the first minute (rest-exercise transition) of the CPX, Pearson's product-moment correlations between relative O2 pulse and CPX duration were performed for each CPX, in order to test the linearity of the relative O2 pulse curve during progressive exercise. After testing the adequacy of linear regression by the magnitude of coefficient of determination of the relative O2 pulse, we then calculated the slopes and intercepts among quintiles for both CPX. To compare the slopes and intercepts, a paired student t-test was performed. All continuous data were reported as mean ± SEM or as otherwise indicated. NCSS statistical software (Kayesville, UT) was used to perform all analyses. Statistical significance was set at p<0.05 for all calculations.RESULTSThe median time between the first and second CPX was 15 months (minimum and maximum of 5 and 62 months, respectively). <a class="elsevierStyleCrossRef" href="#tbl1">Table 1</a> presents the baseline clinical characteristics of all patients divided by quintiles of maximum relative O2 pulse. Except for the higher proportion of apparently healthy subjects and lower proportion of coronary artery bypass surgery in the 5th quintile compared to the 2nd quintile (p<0.05), clinical characteristics were homogeneously distributed among all groups. The proportion of subjects taking beta-blockers differed only between the 4th quintile versus 1st and 3rd quintiles (p<0.05 for both comparisons).Demographic characteristics and exercise responses for both CPX are shown in <a class="elsevierStyleCrossRef" href="#tbl2">Table 2</a> for the entire sample. No significant differences were found for body weight (p = 0.76). Except for maximum HR (p = 0.53), diastolic blood pressure (p = 0.53) and delta VO2/workload (p = 0.14), significant differences were found for all other maximum results when the first and second CPXs were compared; the average increases were 11% and 10% for VO2max and maximum relative O2pulse, respectively.<elsevierMultimedia ident="tbl2"></elsevierMultimedia><a class="elsevierStyleCrossRef" href="#tbl3">Table 3</a> presents the results of selected key variables divided by quintiles for maximum relative O2 pulse. No interactions between factors (quintiles and CPX) were found for any of the variables (p>0.05; <a class="elsevierStyleCrossRef" href="#tbl3">Table 3</a>). No significant differences were found for body weight, maximum HR and delta VO2/workload in each quintile (p>0.05 for all comparisons), except for body weight between first and second CPX in the 5th quintile (p<0.05). In contrast, when the first and second CPXs were compared in each quintile, significant differences were found for VO2max, maximum O2 pulse and maximum relative O2 pulse (p<0.05 for all comparisons). When the respective CPX between 1st and 5th quintiles were compared, significant differences were found for all variables (p<0.05 for all comparisons), except for body weight.<elsevierMultimedia ident="tbl3"></elsevierMultimedia>VO2 increased in a linear manner relative to HR in both CPX from the second minute to maximum exercise (average R2 = 0.84 for both CPX in the entire sample). The average R2 between VO2 and HR from the onset to the second minute of exercise in both CPX was 0.53. The results of the linear regression between relative O2 pulse and CPX time divided by quintiles of maximum relative O2 pulse are shown in <a class="elsevierStyleCrossRef" href="#tbl4">Table 4</a>. The high coefficient of determination (R2) in each quintile reveals the linearity of relative O2 pulse, after exclusion of the first minute of CPX. After a median time of 15 months, no significant differences were found for the slopes and intercepts between the first and second CPX in each quintile of maximum relative O2 pulse (p>0.05 for all comparisons; except for intercept comparison in the 5th quintile, p = 0.007). When extremes of quintiles for maximum relative O2 pulse (i.e., 1st versus 5th quintiles) were compared, its respective slopes were significantly different (p<0.05). In a subset analysis, similar results were found when the slopes between the first and second CPX were compared separately in men (p = 0.75) and women (p = 0.24); among subjects taking beta-blockers (p = 0.78) and in subjects with known coronary artery disease (p = 0.31).<elsevierMultimedia ident="tbl4"></elsevierMultimedia><a class="elsevierStyleCrossRef" href="#fig1">Figure 1</a> shows the relative O2 pulse curves as a function of percentage time during first and second CPX for 1st and 5th quintiles. No differences were found between CPXs for each quintile (p>0.05). The vertical line highlights the linearity of the curves after exclusion of the first 10% of the CPX time.<elsevierMultimedia ident="fig1"></elsevierMultimedia>DISCUSSIONThe results of the present study add to the existing body of research showing a linear increase in O2 pulse throughout maximal incremental non-steady-state exercise testing. In addition, to our knowledge, this is the first study to demonstrate the stability of the O2 pulse curve pattern in a large group of subjects under identical clinical status, who served as their own control in a test-retest design.Our results are in agreement with previous studies, <a class="elsevierStyleCrossRefs" href="#bib3">3,5,10,21</a>in that VO2max and maximum O2 pulse were within normal limits and were significantly higher in the second CPX (p<0.05; <a class="elsevierStyleCrossRefs" href="#tbl2">Table 2 and 3</a>). Even though the purpose of our study was not to assess the influence of exercise training, the higher values observed for VO2max and maximum O2 pulse between tests probably occurred because of the training influence, since almost all the subjects increased their physical activity levels. In addition, an effect due to counseling may have occurred since the remaining 25% of the patients were underwent activity counseling after undergoing their initial CPX.A strong debate regarding the behavior of the SV response to progressive maximum exercise still exists. <a class="elsevierStyleCrossRefs" href="#bib9">9,22–24</a> Variations in these studies include a decrease, <a class="elsevierStyleCrossRef" href="#bib25">25</a> a plateau <a class="elsevierStyleCrossRef" href="#bib26">26</a> or an increase in SV when approaching volitional exhaustion <a class="elsevierStyleCrossRef" href="#bib27">27</a> when untrained, moderately trained or heart disease patients are considered. <a class="elsevierStyleCrossRef" href="#bib24">24</a> The prospective design and complexity of methods for measuring SV in most studies has generally limited sample sizes, and thus limited the external validity of the results. In addition, different testing protocols (graded or constant), type of ergometer (treadmill or cycle), criteria for termination of the test (exhaustion or pre-determined % of age-predicted maximum HR) and also the lack of control of confounding variables such as body weight have limited the interpretation of previous results. Our results support the concept that SV, estimated by relative the O2 pulse response to maximum exercise, increases in a linear fashion throughout exercise in non-athletes as shown by the high R2 (<a class="elsevierStyleCrossRef" href="#tbl4">Table 4</a>). A decrease or a plateau in relative O2 pulse would lead to a reduced R2 which was not the case in our results. Our approach was novel in that we excluded the first minute of CPX to calculate the linearity and slopes of relative O2 pulse. At the onset of a ramp protocol, the lack of linearity in the intensity increment affects the linear increase of HR as a function of VO2 (average R2  =  0.53 for both CPX). <a class="elsevierStyleCrossRef" href="#bib28">28</a> As a consequence, an artificial upward shift in O2 pulse slope occurs at the onset of exercise, as seen in <a class="elsevierStyleCrossRef" href="#fig1">Figure 1</a> during the first 10% of the test (the slopes are visually different before and after the vertical line). Thus, excluding the first minute of the CPX has an advantage in that it allows the direct use of the O2 pulse slope, obviating the need to calculate the VO2 and HR slopes. Although linearity was present irrespective of quintile of maximum relative O2 pulse (high R2 in all quintiles) it is clear that the higher the slope of the relative O2 pulse, the higher will be its linearity, as demonstrated by the positive trend shown in the results of R2 among quintiles of relative O2 pulse (<a class="elsevierStyleCrossRef" href="#tbl4">Table 4</a>).Data have recently emerged in regard to the association between the O2 pulse pattern during CPX and the presence of ischemia during exercise <a class="elsevierStyleCrossRefs" href="#bib5">5,6,29</a>. Belardinelli et al. <a class="elsevierStyleCrossRef" href="#bib5">5</a> studied 202 patients with known coronary heart disease who underwent both myocardial scintigraphy and cycle CPX. By logistic regression analysis, the only independent predictors of a positive myocardial scintigraphy were O2 pulse flattening duration (calculated from the inflection point occurring in VO2 as related to work) and the slope of VO2/workload. The slope of VO2/workload was within normal limits from the start of exercise to a point corresponding to the onset of myocardial ischemia. However, as work rate increased further, an inflection point was evident in most patients with detectable myocardial ischemia, with the cutoff of 3.9 mL.min-1.watts-1 being the strongest independent predictor according to a hierarchical model. Supporting these results, Chaudhry et al., <a class="elsevierStyleCrossRef" href="#bib29">29</a> showed that at the onset of myocardial ischemia, a decrease in the O2 pulse with increasing work rate and a abrupt decrease in the slope of VO2/workload occurred in a 68 year old woman referred for CPX as part of a preoperative evaluation. The O2 pulse patterns observed in these studies are most likely explained by reduced stroke volume at higher intensity exercise due to myocardial ischemia. In contrast, this was not the case in our relatively normal subjects, since delta VO2/workload was within normal limits in all quintiles of maximum relative O2 pulse (<a class="elsevierStyleCrossRef" href="#tbl3">Table 3</a>) and the slopes were significantly different from zero (<a class="elsevierStyleCrossRef" href="#tbl4">Table 4</a>).A novel finding shown by the present study was that, after a median time of 15 months in between first and second CPXs, the relative O2 pulse curve pattern remained unchanged as demonstrated by the lack of significant differences in slopes and intercepts regardless the maximum relative O2 pulse presented in each quintile (<a class="elsevierStyleCrossRef" href="#tbl4">Table 4</a>). The slopes and intercepts were similar despite the significantly higher values of VO2max in second CPX in each quintile of maximum relative O2 pulse (on average 1% to 20% higher on the second CPX). This may have occurred because of the lower sub-maximal HR values during the second CPX, as a result of the improved VO2max (possible training or counseling effect). In fact, three possible combinations of VO2 and HR kinetics may occur after a period of exercise training, the first being that only the VO2 kinetics is modified with training, the second being that only the HR kinetics is modified with training and the third being that both VO2 and HR kinetics are modified with training. The first two cases imply that modifications of O2 pulse slope only mirrors the modification of VO2 or HR kinetics; if such is the case, the relevance of the O2 pulse kinetics is limited. On the other hand, as may have occurred in our study (<a class="elsevierStyleCrossRefs" href="#tbl3">Tables 3 and 4</a>); when both VO2 and HR kinetics are modified, the O2 pulse kinetics do not correlate highly with any of these two variables. The results for the O2 pulse slopes were similar when comparisons between the first and second CPXs were performed, and were also similar when subsets of subjects were analyzed with known coronary artery disease and those taking beta-blockers, which extend the clinical applications of our results to these subgroups.Finally, our study adjusted O2 pulse by body weight. Given the close relationship between SV and body dimensions, <a class="elsevierStyleCrossRefs" href="#bib12">12,13</a> consideration of body dimensions is necessary when evaluating the O2 pulse pattern to exercise. Otherwise, an obese subject might misleadingly have a superior O2 pulse response when compared, for example, to a lean marathoner. To our knowledge, few studies have taken into account the influence of weight on O2 pulse responses to exercise. <a class="elsevierStyleCrossRefs" href="#bib30">30-32</a> This aspect has been an important limitation of both clinical <a class="elsevierStyleCrossRefs" href="#bib6">6,14</a> and physiological studies. <a class="elsevierStyleCrossRefs" href="#bib15">15,16</a> In a study by Munhoz et al.,<a class="elsevierStyleCrossRef" href="#bib6">6</a> 87 patients underwent both myocardial scintigraphy and treadmill CPX in order to compare the O2 pulse response to incremental exercise in patients with and without ischemia as detected by myocardial scintigraphy. Although a flattening of the O2 pulse response occurred in patients with extensive myocardial ischemia when compared to those with mild ischemia, the authors concluded that O2 pulse responses during exercise were not able to discriminate those with and without myocardial ischemia. Caution is in order, however, when interpreting these results, since there were significant differences in the weight of the subjects, which was heavier in those with ischemic responses. It is possible then, that patients with ischemic responses performed better in terms of O2 pulse simply because they were heavier. Unfortunately, the authors did not provide information on the relative O2 pulse responses, which limits comparisons between subjects with different body weights. The sub-maximal O2 pulse has also been reported to be similar between trained and untrained men, when trained men were on average 14 kg lighter than untrained men.<a class="elsevierStyleCrossRef" href="#bib16">16</a> Similarly, O2 pulse was not significantly different between obese and leaner women when obese women were 18 kg heavier on average than leaner women.<a class="elsevierStyleCrossRef" href="#bib15">15</a>Some limitations are of note in the present study. Even though direct measurements of SV were not made, collectively, the evidence is convincing that O2 pulse correlates well with direct measurements of SV. <a class="elsevierStyleCrossRefs" href="#bib11">11,16,21,33,34</a> According to the modified Fick equation, O2 pulse equals the product of SV and arterio-venous oxygen difference. Since the assessment of arterio-venous oxygen difference requires the placement of invasive catheters, we assumed that arterio-venous oxygen difference increases in a predictable way with respect to workload, reaching an approximate constant peak value at close to maximal intensity.<a class="elsevierStyleCrossRefs" href="#bib25">25,35</a> Therefore, after the point where arterio-venous oxygen difference tends to reach its maximum value, any further increase in O2 pulse will reflect changes in SV. Finally, although the aim of the present study was not to assess the influence of exercise training of key dependent variables, we cannot exclude the possible influence of the supervised exercise program or counseling on our results. Considering all the above, some caution should be made when interpreting the results of the present study.Clinical implicationsThe novelty of our study lays in the fact that it was the first study to demonstrate the stability of O2 pulse. By showing the O2 pulse curve stability after a median time of 15 months in subjects under similar clinical conditions and drug regimens, we reject the hypothesis that factors such as measurement variability inherent to any test (in our case CPX), could affect the O2 pulse pattern. This increases in importance considering the established association between O2 pulse curve pattern and myocardial ischemia. In other words, if such variability in the O2 pulse curve pattern was present, rejecting our hypothesis, it could be difficult to discriminate those with a flat O2 pulse curve truly caused by myocardial ischemia from those with a flat curve caused just by variations in measurements inherent to CPX.CONCLUSIONSAfter excluding the first minute of CPX (rest-exercise transition), the relative O2 pulse exhibited a linear increase throughout maximum exercise. In addition, in a test-retest design, where subjects served as their own controls, the pattern of relative O2 pulse remained stable." "textoCompletoSecciones" => array:1 [ "secciones" => array:8 [ 0 => array:2 [ "identificador" => "xpalclavsec1581452" "titulo" => "KEYWORDS" ] 1 => array:2 [ "identificador" => "cesec10" "titulo" => "INTRODUCTION" ] 2 => array:3 [ "identificador" => "cesec20" "titulo" => "MATERIALS AND METHODS" "secciones" => array:4 [ 0 => array:2 [ "identificador" => "cesec30" "titulo" => "Study Population" ] 1 => array:2 [ "identificador" => "cesec40" "titulo" => "Cardiopulmonary Exercise Testing (CPX)" ] 2 => array:2 [ "identificador" => "cesec50" "titulo" => "Hemodynamic and Ventilatory Assessments" ] 3 => array:2 [ "identificador" => "cesec60" "titulo" => "Data management and statistical analyses" ] ] ] 3 => array:2 [ "identificador" => "cesec70" "titulo" => "RESULTS" ] 4 => array:3 [ "identificador" => "cesec80" "titulo" => "DISCUSSION" "secciones" => array:1 [ 0 => array:2 [ "identificador" => "cesec90" "titulo" => "Clinical implications" ] ] ] 5 => array:2 [ "identificador" => "cesec100" "titulo" => "CONCLUSIONS" ] 6 => array:2 [ "identificador" => "xack638843" "titulo" => "ACKNOWLEDGMENTS" ] 7 => array:1 [ "titulo" => "REFERENCES" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2010-10-13" "fechaAceptado" => "2010-10-27" "PalabrasClave" => array:1 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "KEYWORDS" "identificador" => "xpalclavsec1581452" "palabras" => array:4 [ 0 => "Stroke Volume" 1 => "Coronary Artery Disease" 2 => "Cardiopulmonary Exercise Testing, Heart Rate" 3 => "Ramp Protocol" ] ] ] ] "tieneResumen" => true "resumen" => array:1 [ "en" => array:2 [ "resumen" => "INTRODUCTIONExercise oxygen pulse (O2 pulse), a surrogate for stroke volume and arteriovenous oxygen difference, has emerged as an important variable obtained during cardiopulmonary exercise testing. OBJECTIVESWe hypothesized that the O2 pulse curve pattern response to a maximal cycling ramp protocol exhibits a stable linear pattern in subjects reevaluated under the same clinical conditions. METHODSWe retrospectively studied 100 adults (80 males), mean age at baseline of 59 ± 12 years, who performed two cardiopulmonary exercise testings (median interval was 15 months), for clinical and/or exercise prescription reasons. The relative O2 pulse was calculated by dividing its absolute value by body weight. Subjects were classified into quintiles of relative O2 pulse. Cardiopulmonary exercise testing results and the O2 pulse curve pattern, expressed by its slope and intercept, were compared among quintiles of relative O2 pulse at both cardiopulmonary exercise testings. RESULTSAfter excluding the first minute of CPX (rest-exercise transition), the relative O2 pulse curve exhibited a linear increase, as demonstrated by high coefficients of determination (R2 from 0.75 to 0.90; p<0.05 for all quintiles). Even though maximum oxygen uptake and relative O2 pulse were significantly higher in the second cardiopulmonary exercise testing for each quintile of relative O2 pulse (p<0.05 for all comparisons), no differences were found when slopes and intercepts were compared between the first and second cardiopulmonary exercise testings (p>0.05 for all comparisons; except for intercept in the 5th quintile). CONCLUSIONExcluding the rest-exercise transition, the relative O2 pulse exhibited a stable linear increase throughout maximal exercise in adults that were retested under same clinical conditions." "secciones" => array:5 [ 0 => array:2 [ "identificador" => "ceabs10" "titulo" => "INTRODUCTION" ] 1 => array:2 [ "identificador" => "ceabs20" "titulo" => "OBJECTIVES" ] 2 => array:2 [ "identificador" => "ceabs30" "titulo" => "METHODS" ] 3 => array:2 [ "identificador" => "ceabs40" "titulo" => "RESULTS" ] 4 => array:2 [ "identificador" => "ceabs50" "titulo" => "CONCLUSION" ] ] ] ] "multimedia" => array:5 [ 0 => array:7 [ "identificador" => "fig1" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 261 "Ancho" => 420 "Tamanyo" => 18743 ] ] "descripcion" => array:1 [ "en" => "First and second quintiles of relative O2 pulse during CPX. Triangles (▴) stand for results obtained in the first CPX. Closed circles (•) stand for results obtained in the second CPX. The vertical line highlights the linearity of the curves after exclusion of the first 10% of the CPX time. All results of relative O2 pulse were multiplied by 100. The exercise responses and slopes for each quintile are shown in <a class="elsevierStyleCrossRefs" href="#tbl3">tables 3 and 4</a>. Q, quintiles; CPX, cardiopulmonary exercise testing. No significant differences were found when both CPX in each quintile were compared (p>0.05 for all comparisons)." ] ] 1 => array:7 [ "identificador" => "tbl1" "etiqueta" => "Table 1" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "tabla" => array:2 [ "leyenda" => "CABG, coronary artery bypass graft; PTCA, percutaneous transluminal coronary angioplasty; Q, quintile; * p < 0.05 vs. Q1; † p<0.05 vs. Q2; ‡ p<0.05 vs. Q3." "tablatextoimagen" => array:1 [ 0 => array:1 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col"> \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">All (n = 100) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Q1 \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Q2 \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Q3 \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Q4 \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Q5 \t\t\t\t\t\t\n \t\t\t\t\t\t</th></tr><tr title="table-row"><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col"> \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">% \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">N/% \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">N/% \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">N/% \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">N/% \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">N/% \t\t\t\t\t\t\n \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">MedicationsBeta blockers \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">41 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">5/20 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">10/50 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">5/20 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">12/60*‡ \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">9/45 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Calcium channel blockers \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">16 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">4/20 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">4/20 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">4/20 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">3/15 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1/5 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Nitrates \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">10 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2/10 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2/10 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1/5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">4/20 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1/5 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">ACE-inhibitors \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">14 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2/10 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">3/15 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">7/35 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2/10 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Diuretics \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">12 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">6/30 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2/10 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">3/15 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1/5* \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Statins \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">63 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">12/60 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">16/80 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">13/65 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">13/65 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">9/45† \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " colspan="7" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Risk factors</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Hypertension \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">43 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">8/40 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">10/50 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">9/45 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">9/45 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">7/35 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Dyslipidemia \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">50 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">9/45 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">12/60 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">10/50 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">11/55 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">8/40 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Diabetes \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">13 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">1/5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">4/20 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">3/15 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">5/25 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Obesity (BMI ≥ 30 kg/m2) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">14 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">3/15 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">3/15 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">3/15 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">3/15 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2/10 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " colspan="7" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Medical history/Procedures</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Apparently healthy \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">29 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">7/35 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2/10 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">5/25 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">6/30 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">9/45† \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Coronary Artery Disease \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">50 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">8/40 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">13/65 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">10/50 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">12/60 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">7/35 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">CABG \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">26 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">4/20 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">9/45 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">6/30 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">5/25 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">2/10† \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">PTCA \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">26 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">3/15 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">6/30 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">7/35 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">6/30 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">4/20 \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] ] ] ] "descripcion" => array:1 [ "en" => "Baseline clinical characteristics by quintiles of maximum relative O2 pulse." ] ] 2 => array:7 [ "identificador" => "tbl2" "etiqueta" => "Table 2" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "tabla" => array:2 [ "leyenda" => "Values are mean ± SEM. VO2, oxygen uptake; O2, oxygen." "tablatextoimagen" => array:1 [ 0 => array:1 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">VARIABLE N  =  100 \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">First CPX \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Second CPX \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">p-value \t\t\t\t\t\t\n \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " colspan="4" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Demographic characteristics</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Age (yr) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">59 ± 1.2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">60 ± 1.3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><0.001 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Body mass index (kg/m2) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">26.9 ± 0.4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">26.9 ± 0.4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.82 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Height (cm) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">170.4 ± 0.9 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">170.5 ± 0.9 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.14 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Weight (kg) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">78.4 ± 1.3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">78.5 ± 1.4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.76 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " colspan="4" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Resting Values</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Heart rate (beats/min) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">63 ± 1.1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">60 ± 1.3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.01 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Blood pressure (mm Hg) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Systolic \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">133 ± 1.5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">127 ± 2.3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.02 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Diastolic \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">77 ± 1.0 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">72 ± 1.4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><0.001 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " colspan="4" align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Maximum Values</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Heart rate (beats/min) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">144 ± 2.6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">144 ± 2.5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.53 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Blood pressure (mm Hg) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Systolic \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">201 ± 3.1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">207 ± 2.6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.009 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Diastolic \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">91 ± 1.3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">91 ± 1.3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.53 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">VO2 (mL.kg-1.min-1) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">25.1 ± 1.0 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">28.2 ± 1.0 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><0.001 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">O2 pulse (mL.beat-1) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">13.7 ± 0.5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">15.2 ± 0.5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><0.001 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Relative O2 pulse (mL.beat-1.kg-1) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">17.4 ± 0.5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">19.3 ± 0.5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><0.001 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">% achieved of age predicted O2 pulse \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">110 ± 3.2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">128 ± 3.3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><0.001 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Workload (watts) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">133 ± 6.1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">150 ± 6.7 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><0.001 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Delta VO2/workload (mL.min-1.watts-1) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">12.9 ± 0.22 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top">13.2 ± 0.31 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.14 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">Exercise duration (minutes) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top" style="border-bottom: 2px solid black">10 ± 0.2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="top" style="border-bottom: 2px solid black">11 ± 0.2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black"><0.001 \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] ] ] ] "descripcion" => array:1 [ "en" => "Demographic characteristics and exercise test responses." ] ] 3 => array:7 [ "identificador" => "tbl3" "etiqueta" => "Table 3" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "tabla" => array:2 [ "leyenda" => "Values are mean ± SEM. VO2, oxygen uptake; O2, oxygen; Q, quintile. * All results of maximum relative O2 pulse were multiplied by 100." "tablatextoimagen" => array:1 [ 0 => array:1 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col"> \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Body Weight \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Maximum VO2 \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Maximum heart rate \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Maximum O2 pulse \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Maximum relative O2 pulse \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Delta VO2/workload \t\t\t\t\t\t\n \t\t\t\t\t\t</th></tr><tr title="table-row"><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col"> \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">(kg) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">(mL.kg-1.min-1) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">(beats.min-1) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">(mL.beat-1) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">(mL.beat-1.kg-1)* \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">(mL.min-1.watts-1) \t\t\t\t\t\t\n \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Q1 (n = 20) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">First CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">74.2 ± 3.6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">16.4 ± 0.6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">143 ± 4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">8.6 ± 0.4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">11.6 ± 0.3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">12.1 ± 0.6 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Second CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">74.1 ± 3.7 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">20.2 ± 1.0 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">143 ± 4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">10.6 ± 0.6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">14.3 ± 0.6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">13.3 ± 0.7 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Q2 (n = 20) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">First CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">75.2 ± 3.3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">19.5 ± 1.0 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">138 ± 7 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">10.8 ± 0.5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">14.3 ± 0.1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">12.5 ± 0.4 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Second CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">74.9 ± 3.6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">24.3 ± 1.3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">140 ± 6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">13.2 ± 0.8 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">17.6 ± 0.7 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">12.9 ± 0.5 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Q3 (n = 20) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">First CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">82.3 ± 2.7 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">22.9 ± 0.7 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">142 ± 6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">13.4 ± 0.4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">16.3 ± 0.2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">13.0 ± 0.4 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Second CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">81.5 ± 3.0 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">26.4 ± 1.3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">143 ± 5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">15.1 ± 0.6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">18.7 ± 0.7 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">12.7 ± 0.4 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Q4 (n = 20) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">First CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">82.2 ± 2.6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">27.1 ± 1.5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">139 ± 6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">16.2 ± 0.6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">19.7 ± 0.2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">12.8 ± 0.4 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Second CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">82.6 ± 5.3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">29.6 ± 2.2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">139 ± 6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">17.8 ± 1.1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">21.4 ± 1.1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">12.6 ± 0.4 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Q5 (n = 20) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">First CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">78.2 ± 2.4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">39.9 ± 2.5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">159 ± 5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">19.5 ± 1.0 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">24.9 ± 1.0 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">13.9 ± 0.5 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Second CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">79.6 ± 2.5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">40.3 ± 2.6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">160 ± 6 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">19.5 ± 1.1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">24.4 ± 1.2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">14.8 ± 1.1 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">p value \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Quintile factor \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.018 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><0.001 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.002 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><0.001 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><0.001 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.021 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">CPX factor \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.949 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.004 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><0.843 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.002 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><0.001 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.312 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">Interaction \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">0.998 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">0.740 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">0.999 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">0.601 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">0.113 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">0.687 \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] ] ] ] "descripcion" => array:1 [ "en" => "Cardiopulmonary exercise testing results by quintiles of maximum relative O2 pulse." ] ] 4 => array:7 [ "identificador" => "tbl4" "etiqueta" => "Table 4" "tipo" => "MULTIMEDIATABLA" "mostrarFloat" => true "mostrarDisplay" => false "tabla" => array:2 [ "leyenda" => "R2, coefficient of determination for correlation between Relative O2 Pulse and CPX duration; CI, Confidence interval; Q, quintile. * Slopes significantly different from zero (p<0.05)." "tablatextoimagen" => array:1 [ 0 => array:1 [ "tabla" => array:1 [ 0 => """ <table border="0" frame="\n \t\t\t\t\tvoid\n \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col"> \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">R2 \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Slope* (95% CI) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Slope p-value versus Q5 \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Slope p-value 1st vs 2nd CPX \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Intercept (95% CI) \t\t\t\t\t\t\n \t\t\t\t\t\t</th><th class="td" title="\n \t\t\t\t\ttable-head\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" scope="col">Intercept p-value 1st vs 2nd CPX \t\t\t\t\t\t\n \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Q1 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">First CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.78 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.61 (0.47 - 0.76) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t"><0.001 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.57 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">6.9 (5.8 - 8.0) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.22 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Second CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.79 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.68 (0.50 - 0.85) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.04 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">8.1 (9.1 - 12.3) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Q2 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">First CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.75 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.62 (0.43 - 0.80) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.003 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.37 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">9.4 (8.3 - 10.5) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.13 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Second CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.78 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.73 (0.56 - 0.90) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.34 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">10.7 (9.11 - 14.0) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Q3 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">First CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.82 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.68 (0.51 - 0.85) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.009 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.27 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">10.3 (9.1 - 11.5) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.82 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Second CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.86 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.79 (0.63 - 0.95) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.61 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">10.5 (8.7 - 12.4) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Q4 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">First CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.84 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.88 (0.70 - 1.05) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.36 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.54 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">11.1 (9.7 - 12.5) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.10 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Second CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.85 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.81 (0.62 - 1.01) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.79 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">12.6 (11.0 - 14.2) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">Q5 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t"> \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t">First CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.90 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.99 (0.82 - 1.15) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t">- \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.12 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">12.8 (10.9 - 14.6) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t">0.007 \t\t\t\t\t\t\n \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="left" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">Second CPX \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">0.89 \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">0.85 (0.66 - 1.03) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="center" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">- \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black"> \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="char" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black">15.4 (13.6 - 17.1) \t\t\t\t\t\t\n \t\t\t\t</td><td class="td" title="\n \t\t\t\t\ttable-entry\n \t\t\t\t " align="" valign="\n \t\t\t\t\ttop\n \t\t\t\t" style="border-bottom: 2px solid black"> \t\t\t\t\t\t\n \t\t\t\t</td></tr></tbody></table> """ ] ] ] ] "descripcion" => array:1 [ "en" => "Linear regression results by quintiles of maximum relative O2 pulse." ] ] ] "bibliografia" => array:2 [ "titulo" => "REFERENCES" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "cebibsec10" "bibliografiaReferencia" => array:35 [ 0 => array:3 [ "identificador" => "bib1" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Cardiac Output during Submaximal and Maximal Work" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:4 [ 0 => """ PO Astrand \n \t\t\t\t\t\t\t\t """ 1 => """ TE Cuddy \n \t\t\t\t\t\t\t\t """ 2 => """ B Saltin \n \t\t\t\t\t\t\t\t """ 3 => """ J Stenberg \n \t\t\t\t\t\t\t\t """ ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Revista" => array:4 [ "tituloSerie" => "J Appl Physiol" "fecha" => "1964" "volumen" => "19" "paginaInicial" => "74" ] ] ] ] ] ] 1 => array:3 [ "identificador" => "bib2" "etiqueta" => "2" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Advances in noninvasive cardiac output monitoring" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:2 [ 0 => """ DM Linton \n \t\t\t\t\t\t\t\t """ 1 => """ D Gilon \n \t\t\t\t\t\t\t\t """ ] ] ] ] ] "host" => array:1 [ 0 => array:1 [ "Revista" => array:4 [ "tituloSerie" => "Ann Card Anaesth" "fecha" => "2002" "volumen" => "5" "paginaInicial" => "8" ] ] ] ] ] ] 2 => array:3 [ "identificador" => "bib3" "etiqueta" => "3" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Maximal exercise oxygen pulse as a predictor of mortality among male veterans referred for exercise testing" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:6 [ 0 => """ RB Oliveira \n \t\t\t\t\t\t\t\t """ 1 => """ J Myers \n \t\t\t\t\t\t\t\t """ 2 => """ CG Araujo \n \t\t\t\t\t\t\t\t """ 3 => """ J Abella \n \t\t\t\t\t\t\t\t """ 4 => """ S Mandic \n \t\t\t\t\t\t\t\t """ 5 => """ V Froelicher \n \t\t\t\t\t\t\t\t """ ] ] ] ] ] "host" => array:2 [ 0 => array:1 [ "Revista" => array:4 [ "tituloSerie" => "Eur J Cardiovasc Prev Rehabil" "fecha" => "2009" "volumen" => "16" "paginaInicial" => "64" ] ] 1 => array:1 [ "WWW" => array:1 [ "link" => "https://doi.org/10.1097/HJR.0b013e3283292fe8" ] ] ] ] ] ] 3 => array:3 [ "identificador" => "bib4" "etiqueta" => "4" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Does peak oxygen pulse complement peak oxygen uptake in risk stratifying patients with heart failure" "autores" => array:1 [ 0 => array:2 [ "etal" => true "autores" => array:6 [ 0 => """ RB Oliveira \n \t\t\t\t\t\t\t\t """ 1 => """ J Myers \n \t\t\t\t\t\t\t\t """ 2 => """ CG Araujo \n \t\t\t\t\t\t\t\t """ 3 => """ R Arena \n \t\t\t\t\t\t\t\t """ 4 => """ S Mandic \n \t\t\t\t\t\t\t\t """ 5 => """ D Bensimhon \n \t\t\t\t\t\t\t\t """ ] ] ] ] ] "host" => array:2 [ 0 => array:1 [ "Revista" => array:4 [ "tituloSerie" => "Am J Cardiol" "fecha" => "2009" "volumen" => "104" "paginaInicial" => "8" ] ] 1 => array:1 [ "WWW" => array:1 [ "link" => "https://doi.org/10.1016/j.amjcard.2009.04.022" ] ] ] ] ] ] 4 => array:3 [ "identificador" => "bib5" "etiqueta" => "5" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Exercise-induced myocardial ischaemia detected by cardiopulmonary exercise testing" "autores" => array:1 [ 0 => array:2 [ "etal" => true "autores" => array:6 [ 0 => """ R Belardinelli \n \t\t\t\t\t\t\t\t """ 1 => """ F Lacalaprice \n \t\t\t\t\t\t\t\t """ 2 => """ F Carle \n \t\t\t\t\t\t\t\t """ 3 => """ A Minnucci \n \t\t\t\t\t\t\t\t """ 4 => """ G Cianci \n \t\t\t\t\t\t\t\t """ 5 => """ G Perna \n \t\t\t\t\t\t\t\t """ ] ] ] ] ] "host" => array:2 [ 0 => array:2 [ "doi" => "10.1016/s0195-0668x(02)00809-6" "Revista" => array:5 [ "tituloSerie" => "Eur Heart J" "fecha" => "2003" "volumen" => "24" "paginaInicial" => "13" "link" => array:1 [ 0 => array:2 [ "url" => "https://www.ncbi.nlm.nih.gov/pubmed/12559931" "web" => "Medline" ] ] ] ] 1 => array:2 [ "doi" => "10.1016/s0195-0668x(02)00809-6" "WWW" => array:1 [ "link" => "https://doi.org/10.1016/S0195-668X(03)00210-0" ] ] ] ] ] ] 5 => array:3 [ "identificador" => "bib6" "etiqueta" => "6" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Flattening of oxygen pulse during exercise may detect extensive myocardial ischemia" "autores" => array:1 [ 0 => array:2 [ "etal" => true "autores" => array:6 [ 0 => """ EC Munhoz \n \t\t\t\t\t\t\t\t """ 1 => """ R Hollanda \n \t\t\t\t\t\t\t\t """ 2 => """ JP Vargas \n \t\t\t\t\t\t\t\t """ 3 => """ CW Silveira \n \t\t\t\t\t\t\t\t """ 4 => """ AL Lemos \n \t\t\t\t\t\t\t\t """ 5 => """ RM Hollanda \n \t\t\t\t\t\t\t\t """ ] ] ] ] ] "host" => array:2 [ 0 => array:1 [ "Revista" => array:4 [ "tituloSerie" => "Med Sci Sports Exerc" "fecha" => "2007" "volumen" => "39" "paginaInicial" => "6" ] ] 1 => array:1 [ "WWW" => array:1 [ "link" => "https://doi.org/10.1249/mss.0b013e3180601136" ] ] ] ] ] ] 6 => array:3 [ "identificador" => "bib7" "etiqueta" => "7" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Oxygen pulse during exercise is related to resting systolic and diastolic left ventricular function in older persons with mild hypertension" "autores" => array:1 [ 0 => array:2 [ "etal" => true "autores" => array:6 [ 0 => """ JG Lim \n \t\t\t\t\t\t\t\t """ 1 => """ TJ McAveney \n \t\t\t\t\t\t\t\t """ 2 => """ JL Fleg \n \t\t\t\t\t\t\t\t """ 3 => """ EP Shapiro \n \t\t\t\t\t\t\t\t """ 4 => """ KL Turner \n \t\t\t\t\t\t\t\t """ 5 => """ AC Bacher \n \t\t\t\t\t\t\t\t """ ] ] ] ] ] "host" => array:2 [ 0 => array:1 [ "Revista" => array:4 [ "tituloSerie" => "Am Heart J" "fecha" => "2005" "volumen" => "150" "paginaInicial" => "6" ] ] 1 => array:1 [ "WWW" => array:1 [ "link" => "https://doi.org/10.1016/j.ahj.2004.12.021" ] ] ] ] ] ] 7 => array:3 [ "identificador" => "bib8" "etiqueta" => "8" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Mild mitral regurgitation reduces exercise capacity in patients with idiopathic dilated cardiomyopathy" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:6 [ 0 => """ H Tada \n \t\t\t\t\t\t\t\t """ 1 => """ J Tamai \n \t\t\t\t\t\t\t\t """ 2 => """ H Takaki \n \t\t\t\t\t\t\t\t """ 3 => """ E Ohnishi \n \t\t\t\t\t\t\t\t """ 4 => """ Y Okano \n \t\t\t\t\t\t\t\t """ 5 => """ T Yoshioka \n \t\t\t\t\t\t\t\t """ ] ] ] ] ] "host" => array:2 [ 0 => array:1 [ "Revista" => array:4 [ "tituloSerie" => "Int J Cardiol" "fecha" => "1997" 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1 => array:1 [ "WWW" => array:1 [ "link" => "https://doi.org/10.1063/1.357720" ] ] ] ] ] ] ] ] ] ] "agradecimientos" => array:1 [ 0 => array:4 [ "identificador" => "xack638843" "titulo" => "ACKNOWLEDGMENTS" "texto" => "Ricardo Oliveira was supported by FAPERJ (Brazil). Claudio Gil Araújo is a recipient of research fellowships from CAPES and FAPERJ (Brazil)" "vista" => "all" ] ] ] "idiomaDefecto" => "en" "url" => "/18075932/0000006600000002/v1_202212010821/S1807593222015162/v1_202212010821/en/main.assets" "Apartado" => null "PDF" => "https://static.elsevier.es/multimedia/18075932/0000006600000002/v1_202212010821/S1807593222015162/v1_202212010821/en/main.pdf?idApp=UINPBA00004N&text.app=https://www.elsevier.es/" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1807593222015162?idApp=UINPBA00004N"]

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CLINICAL SCIENCE

Ricardo Brandão OliveiraI,

Corresponding author

ricardobrandaorj@gmail.com

Tel.: 55 21 2256-7183

, Jonathan MyersII, Claudio Gil Soares de AraújoI,III

I Gama Filho University Exercise Physiology, Rio de Janeiro, Rio de Janeiro, Brazil.

II Division of Cardiovascular Medicine, Stanford University and Veterans Affairs Palo Alto Health Care System, Palo Alto, USA.

III Clinimex Clnica de Medicina do Exerccio, Rio de Janeiro, Brazil.

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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="cesec10" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle70">INTRODUCTION</span><p id="para10" class="elsevierStylePara elsevierViewall">The stroke volume &#40;SV&#41; response to exercise is considered one of the most important indices of heart function&#46;<a class="elsevierStyleCrossRef" href="#bib1">1</a> Unfortunately&#44; its direct measurement during exercise requires intravascular catheterization&#44; and therefore is rarely performed in the clinical setting&#46; Consequently&#44; several noninvasive methods to estimate exercise SV have been developed&#46;<a class="elsevierStyleCrossRef" href="#bib2">2</a> Recently&#44; attention has been given to the oxygen pulse &#40;O<span class="elsevierStyleInf">2</span> pulse&#41;&#44; a readily available variable obtained during cardiopulmonary exercise testing &#40;CPX&#41;&#44; calculated by the ratio of oxygen uptake &#40;VO<span class="elsevierStyleInf">2</span>&#41; and heart rate &#40;HR&#41;&#46; The O<span class="elsevierStyleInf">2</span> pulse has been demonstrated to be a powerful predictor of mortality in patients with cardiovascular diseases<a class="elsevierStyleCrossRefs" href="#bib3">3&#44;4</a> and it has been associated to the onset of exercise-induced ischemia&#46;<a class="elsevierStyleCrossRefs" href="#bib5">5&#44;6</a> Although clinically useful&#44; the O<span class="elsevierStyleInf">2</span> pulse is not a simple variable to consider&#44; since it is influenced by many factors that can confound its interpretation&#44; including the presence of diastolic dysfunction&#44;<a class="elsevierStyleCrossRef" href="#bib7">7</a> valvular regurgitation&#44;<a class="elsevierStyleCrossRef" href="#bib8">8</a> fitness level &#40;athletes may exhibit a plateau in oxygen pulse at higher levels of exercise&#44; likely reflecting a physiological limitation of SV at the upper limits of HR&#41;&#44;<a class="elsevierStyleCrossRef" href="#bib9">9</a> testing protocol<a class="elsevierStyleCrossRef" href="#bib10">10</a> and body dimensions&#46;<a class="elsevierStyleCrossRef" href="#bib11">11</a></p><p id="para20" class="elsevierStylePara elsevierViewall">Rearranging the terms in the modified Fick equation&#44; we have&#59; VO<span class="elsevierStyleInf">2</span>&#47;HR &#8200;&#61;&#8200; &#40;CO &#215; Ca<span class="elsevierStyleInf">O2</span>&#41;&#47;HR &#8211; &#40;CO &#215; Cv<span class="elsevierStyleInf">O2</span>&#41;&#47;HR&#44; where CO is cardiac output and Ca<span class="elsevierStyleInf">O2</span> and Cv<span class="elsevierStyleInf">O2</span> are the arterial and mixed venous O<span class="elsevierStyleInf">2</span> contents&#44; respectively&#46; Whipp et al&#46;<a class="elsevierStyleCrossRef" href="#bib11">11</a> postulated that O<span class="elsevierStyleInf">2</span> pulse&#44; when plotted as a function of 1&#47;HR&#44; results in a linear relationship that extrapolates to the asymptotic O<span class="elsevierStyleInf">2</span> pulse&#46; In other words&#44; during progressive exercise&#44; when VO<span class="elsevierStyleInf">2</span> changes as a linear function of HR&#44; the O<span class="elsevierStyleInf">2</span> pulse equals the slope of the VO<span class="elsevierStyleInf">2</span>-HR relationship&#46; This relationship only holds true however&#44; if it is assumed that the product of CO and Cv<span class="elsevierStyleInf">O2</span> is constant during steady-state work rates as seen in graded exercise testing protocols &#40;e&#46;g&#46;&#58; Bruce protocol&#41; and also that Ca<span class="elsevierStyleInf">O2</span> is normally constant during exercise&#46; To our knowledge&#44; the O<span class="elsevierStyleInf">2</span> pulse curve pattern during the now-commonly used non-steady-state &#40;ramp protocol&#41; incremental exercise test has not been well described&#46;</p><p id="para30" class="elsevierStylePara elsevierViewall">In addition&#44; since SV is directly influenced by body dimensions<a class="elsevierStyleCrossRefs" href="#bib12">12&#44;13</a> and O<span class="elsevierStyleInf">2</span> pulse is related to the SV response to exercise&#44; adjustments for body dimensions or weight should be included in studies aiming to evaluate the O<span class="elsevierStyleInf">2</span> pulse response to exercise&#46; If only maximal values are considered&#44; overweight or obese subjects would have a superior O<span class="elsevierStyleInf">2</span> pulse response&#44; which is likely misleading considering the higher prevalence of cardiovascular disease in this particular group&#46; This aspect has been an important limitation of both clinical<a class="elsevierStyleCrossRefs" href="#bib6">6&#44;14</a> and physiological studies<a class="elsevierStyleCrossRefs" href="#bib15">15&#44;16</a> and requires further exploration&#46;</p><p id="para40" class="elsevierStylePara elsevierViewall">In the present study&#44; we tested the hypothesis that O<span class="elsevierStyleInf">2</span> pulse corrected for body weight &#40;hereafter termed relative O<span class="elsevierStyleInf">2</span> pulse&#41; in response to non-steady-state incremental exercise testing demonstrates a linear pattern in a well controlled data set of subjects referred for exercise testing at our institution&#46; In addition&#44; we tested the hypothesis that the relative O<span class="elsevierStyleInf">2</span> pulse curve pattern during progressive exercise&#44; expressed by its slope and intercept&#44; remains stable during serial testing under the same clinical conditions and similar drug regimens&#46;</p></span><span id="cesec20" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle80">MATERIALS AND METHODS</span><span id="cesec30" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle90">Study Population</span><p id="para50" class="elsevierStylePara elsevierViewall">We retrospectively studied a sample consisting of 502 adult non-athletes referred&#44; at least twice&#44; for exercise testing for clinical and&#47;or exercise pre-participation reasons at our clinic from January 02&#44; 2001 to October 31 2009&#46; The study was designed to conform to the Declaration of Helsinki and approved by the Institutional Ethics Committee&#46; Inclusion criteria consisted of patients who&#58; a&#41; performed two maximal cycling ramp protocol CPX at least 3 months apart&#59; b&#41; did not change clinical status and regular use of medications that might have affected the cardiovascular response to exercise &#40;such as beta-blockers&#41; at both CPXs&#46; Subjects with valvular heart disease&#44; lung disease&#44; anemia and those who exhibited O<span class="elsevierStyleInf">2</span> desaturation &#40;more than 4&#37; at maximal effort&#41; during exercise were excluded from the study&#46; In addition&#44; all CPXs stopped early for clinical indications were not considered maximal and were excluded&#46; After applying all inclusion and exclusion criteria&#44; 100 subjects were considered for final analyses &#40;80 men&#41;&#44; of whom 50&#37; had coronary artery disease&#46; Baseline clinical characteristics are shown in <a class="elsevierStyleCrossRef" href="#tbl1">Table 1</a>&#46; After undergoing the first CPX&#44; 75&#37; of the subjects attended a supervised exercise program at our clinic at least three times a week&#44; while the remaining 25&#37; received advice regarding exercise&#46;</p><elsevierMultimedia ident="tbl1"></elsevierMultimedia></span><span id="cesec40" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle100">Cardiopulmonary Exercise Testing &#40;CPX&#41;</span><p id="para60" class="elsevierStylePara elsevierViewall">After providing written informed consent&#44; all subjects underwent a symptom-limited CPX using an electronically-braked cycle ergometer &#40;EC-1600&#59; Cat Eye&#59;&#44; Japan or CG-04&#44; Inbrasport&#44; Brazil&#41;&#44; according to an individualized ramp protocol designed to allow patients to reach maximum exercise within the desirable range of 8 to 12 minutes&#46;<a class="elsevierStyleCrossRefs" href="#bib17">17&#44;18</a> The patients were verbally encouraged to exercise to volitional fatigue&#44; regardless the maximal HR attained&#46; No medications were stopped before the CPX&#46; The electrocardiogram &#40;ECG&#41; &#40;Cardiolife TEC 7100&#59; Nihon-Kohden&#44; Japan&#59; or Elite Ergo PC 3&#46;2&#46;1&#46;5&#59; Micromed&#44; Brazil&#41; was continuously monitored via a single lead &#40;CC5 or CM5&#41;&#46; Ventilatory expired gas analysis was obtained by a metabolic system &#40;VO2000&#59; MedGraphics&#44; US&#41;&#46; The air flow and oxygen and carbon dioxide sensors were calibrated before each test using 2-liter syringes and gases with known volumes of oxygen&#44; nitrogen&#44; and carbon dioxide concentrations&#46; No test results were classified as indeterminate&#46; All exercise tests were performed&#44; analyzed and reported according to a standardized protocol by a single experienced physician&#46;</p></span><span id="cesec50" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle110">Hemodynamic and Ventilatory Assessments</span><p id="para70" class="elsevierStylePara elsevierViewall">The HR was analyzed beat-by-beat and expressed every 10-s&#46; Maximum HR was considered as the highest 10-s average obtained during the CPX&#46; The age-predicted maximum HR was also calculated by the equation &#91;210-&#40;0&#46;65 &#215; age&#41;&#93;&#46; <a class="elsevierStyleCrossRef" href="#bib19">19</a> Expired ventilatory data were analyzed and expressed at each 10-s&#46; Maximum VO<span class="elsevierStyleInf">2</span> &#40;VO<span class="elsevierStyleInf">2max</span>&#41; was expressed as the highest 60-s average value obtained during the CPX&#46; The age-predicted VO<span class="elsevierStyleInf">2max</span> was also calculated according to standard equations&#46; <a class="elsevierStyleCrossRef" href="#bib19">19</a> Delta VO<span class="elsevierStyleInf">2</span>&#47;workload was calculated as&#58; VO<span class="elsevierStyleInf">2max</span> &#8211; resting VO<span class="elsevierStyleInf">2</span> divided by maximum workload and expressed in mL&#46;min<span class="elsevierStyleSup">-1</span>&#46;watts<span class="elsevierStyleSup">-1</span>&#46; For practical purposes&#44; the resting VO<span class="elsevierStyleInf">2</span> while sitting on the cycle ergometer was considered to be 3&#46;5 mL&#46;kg<span class="elsevierStyleSup">-1</span>&#46;min<span class="elsevierStyleSup">-1</span> for all subjects&#46; O<span class="elsevierStyleInf">2</span> pulse was calculated by dividing VO<span class="elsevierStyleInf">2</span> by HR obtained every 10-s during CPX&#46; Maximum O<span class="elsevierStyleInf">2</span> pulse was expressed as the highest 60-s average value and was expressed in milliliters per beat&#46; In addition&#44; this value was expressed as a percentage of age-predicted achieved&#44; which corresponds to the ratio between the predicted values for maximum VO<span class="elsevierStyleInf">2</span> and maximum HR&#46; In order to remove the influence of body weight on the magnitude of O<span class="elsevierStyleInf">2</span> pulse response during CPX&#44; its values were then divided by weight in kilograms &#40;relative O<span class="elsevierStyleInf">2</span> pulse&#41;&#46; In order to make the mathematical manipulations of the study easier&#44; all results related to the relative O<span class="elsevierStyleInf">2</span> pulse were multiplied by 100&#46;</p></span><span id="cesec60" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle120">Data management and statistical analyses</span><p id="para80" class="elsevierStylePara elsevierViewall">One of the strategies for testing our hypothesis was to divide the sample into quintiles&#44; according to the results of maximum relative O<span class="elsevierStyleInf">2</span> pulse obtained during the first CPX&#46; Dividing the sample by quintiles allowed us to compare the stability of relative O<span class="elsevierStyleInf">2</span> pulse in subjects with different fitness levels and values of maximum relative O<span class="elsevierStyleInf">2</span> pulse&#46; Paired students t-tests were used to assess the differences for key variables between the first and second CPX&#44; when comparisons were made for the entire sample&#46; A &#967;<span class="elsevierStyleSup">2</span> statistics was used for comparisons of categorical variables among quintiles of relative O<span class="elsevierStyleInf">2</span> pulse&#46; For comparisons made on key variables among quintiles of maximum relative O<span class="elsevierStyleInf">2</span> pulse&#44; a repeated-measures two-way ANOVA with Greenhouse-Geisser correction <a class="elsevierStyleCrossRef" href="#bib20">20</a> was performed&#44; in which CPX &#40;i&#46;e&#46;&#44; first versus second CPX&#41; and quintiles of maximum relative O<span class="elsevierStyleInf">2</span> were the main factors&#46; After excluding the first minute &#40;rest-exercise transition&#41; of the CPX&#44; Pearson&#39;s product-moment correlations between relative O<span class="elsevierStyleInf">2</span> pulse and CPX duration were performed for each CPX&#44; in order to test the linearity of the relative O<span class="elsevierStyleInf">2</span> pulse curve during progressive exercise&#46; After testing the adequacy of linear regression by the magnitude of coefficient of determination of the relative O<span class="elsevierStyleInf">2</span> pulse&#44; we then calculated the slopes and intercepts among quintiles for both CPX&#46; To compare the slopes and intercepts&#44; a paired student t-test was performed&#46; All continuous data were reported as mean &#177; SEM or as otherwise indicated&#46; NCSS statistical software &#40;Kayesville&#44; UT&#41; was used to perform all analyses&#46; Statistical significance was set at p&#60;0&#46;05 for all calculations&#46;</p></span></span><span id="cesec70" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle130">RESULTS</span><p id="para90" class="elsevierStylePara elsevierViewall">The median time between the first and second CPX was 15 months &#40;minimum and maximum of 5 and 62 months&#44; respectively&#41;&#46; <a class="elsevierStyleCrossRef" href="#tbl1">Table 1</a> presents the baseline clinical characteristics of all patients divided by quintiles of maximum relative O<span class="elsevierStyleInf">2</span> pulse&#46; Except for the higher proportion of apparently healthy subjects and lower proportion of coronary artery bypass surgery in the 5<span class="elsevierStyleSup">th</span> quintile compared to the 2<span class="elsevierStyleSup">nd</span> quintile &#40;p&#60;0&#46;05&#41;&#44; clinical characteristics were homogeneously distributed among all groups&#46; The proportion of subjects taking beta-blockers differed only between the 4<span class="elsevierStyleSup">th</span> quintile versus 1<span class="elsevierStyleSup">st</span> and 3<span class="elsevierStyleSup">rd</span> quintiles &#40;p&#60;0&#46;05 for both comparisons&#41;&#46;</p><p id="para100" class="elsevierStylePara elsevierViewall">Demographic characteristics and exercise responses for both CPX are shown in <a class="elsevierStyleCrossRef" href="#tbl2">Table 2</a> for the entire sample&#46; No significant differences were found for body weight &#40;p&#8200;&#61;&#8200;0&#46;76&#41;&#46; Except for maximum HR &#40;p&#8200;&#61;&#8200;0&#46;53&#41;&#44; diastolic blood pressure &#40;p&#8200;&#61;&#8200;0&#46;53&#41; and delta VO<span class="elsevierStyleInf">2</span>&#47;workload &#40;p&#8200;&#61;&#8200;0&#46;14&#41;&#44; significant differences were found for all other maximum results when the first and second CPXs were compared&#59; the average increases were 11&#37; and 10&#37; for VO<span class="elsevierStyleInf">2max</span> and maximum relative O<span class="elsevierStyleInf">2</span>pulse&#44; respectively&#46;</p><elsevierMultimedia ident="tbl2"></elsevierMultimedia><p id="para110" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#tbl3">Table 3</a> presents the results of selected key variables divided by quintiles for maximum relative O<span class="elsevierStyleInf">2</span> pulse&#46; No interactions between factors &#40;quintiles and CPX&#41; were found for any of the variables &#40;p&#62;0&#46;05&#59; <a class="elsevierStyleCrossRef" href="#tbl3">Table 3</a>&#41;&#46; No significant differences were found for body weight&#44; maximum HR and delta VO<span class="elsevierStyleInf">2</span>&#47;workload in each quintile &#40;p&#62;0&#46;05 for all comparisons&#41;&#44; except for body weight between first and second CPX in the 5<span class="elsevierStyleSup">th</span> quintile &#40;p&#60;0&#46;05&#41;&#46; In contrast&#44; when the first and second CPXs were compared in each quintile&#44; significant differences were found for VO<span class="elsevierStyleInf">2max</span>&#44; maximum O<span class="elsevierStyleInf">2</span> pulse and maximum relative O<span class="elsevierStyleInf">2</span> pulse &#40;p&#60;0&#46;05 for all comparisons&#41;&#46; When the respective CPX between 1st and 5<span class="elsevierStyleSup">th</span> quintiles were compared&#44; significant differences were found for all variables &#40;p&#60;0&#46;05 for all comparisons&#41;&#44; except for body weight&#46;</p><elsevierMultimedia ident="tbl3"></elsevierMultimedia><p id="para120" class="elsevierStylePara elsevierViewall">VO<span class="elsevierStyleInf">2</span> increased in a linear manner relative to HR in both CPX from the second minute to maximum exercise &#40;average R<span class="elsevierStyleSup">2</span>&#8200;&#61;&#8200;0&#46;84 for both CPX in the entire sample&#41;&#46; The average R<span class="elsevierStyleSup">2</span> between VO<span class="elsevierStyleInf">2</span> and HR from the onset to the second minute of exercise in both CPX was 0&#46;53&#46; The results of the linear regression between relative O<span class="elsevierStyleInf">2</span> pulse and CPX time divided by quintiles of maximum relative O<span class="elsevierStyleInf">2</span> pulse are shown in <a class="elsevierStyleCrossRef" href="#tbl4">Table 4</a>&#46; The high coefficient of determination &#40;R<span class="elsevierStyleSup">2</span>&#41; in each quintile reveals the linearity of relative O<span class="elsevierStyleInf">2</span> pulse&#44; after exclusion of the first minute of CPX&#46; After a median time of 15 months&#44; no significant differences were found for the slopes and intercepts between the first and second CPX in each quintile of maximum relative O<span class="elsevierStyleInf">2</span> pulse &#40;p&#62;0&#46;05 for all comparisons&#59; except for intercept comparison in the 5<span class="elsevierStyleSup">th</span> quintile&#44; p&#8200;&#61;&#8200;0&#46;007&#41;&#46; When extremes of quintiles for maximum relative O<span class="elsevierStyleInf">2</span> pulse &#40;i&#46;e&#46;&#44; 1<span class="elsevierStyleSup">st</span> versus 5<span class="elsevierStyleSup">th</span> quintiles&#41; were compared&#44; its respective slopes were significantly different &#40;p&#60;0&#46;05&#41;&#46; In a subset analysis&#44; similar results were found when the slopes between the first and second CPX were compared separately in men &#40;p&#8200;&#61;&#8200;0&#46;75&#41; and women &#40;p&#8200;&#61;&#8200;0&#46;24&#41;&#59; among subjects taking beta-blockers &#40;p&#8200;&#61;&#8200;0&#46;78&#41; and in subjects with known coronary artery disease &#40;p&#8200;&#61;&#8200;0&#46;31&#41;&#46;</p><elsevierMultimedia ident="tbl4"></elsevierMultimedia><p id="para130" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig1">Figure 1</a> shows the relative O<span class="elsevierStyleInf">2</span> pulse curves as a function of percentage time during first and second CPX for 1<span class="elsevierStyleSup">st</span> and 5<span class="elsevierStyleSup">th</span> quintiles&#46; No differences were found between CPXs for each quintile &#40;p&#62;0&#46;05&#41;&#46; The vertical line highlights the linearity of the curves after exclusion of the first 10&#37; of the CPX time&#46;</p><elsevierMultimedia ident="fig1"></elsevierMultimedia></span><span id="cesec80" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle140">DISCUSSION</span><p id="para140" class="elsevierStylePara elsevierViewall">The results of the present study add to the existing body of research showing a linear increase in O<span class="elsevierStyleInf">2</span> pulse throughout maximal incremental non-steady-state exercise testing&#46; In addition&#44; to our knowledge&#44; this is the first study to demonstrate the stability of the O<span class="elsevierStyleInf">2</span> pulse curve pattern in a large group of subjects under identical clinical status&#44; who served as their own control in a test-retest design&#46;</p><p id="para150" class="elsevierStylePara elsevierViewall">Our results are in agreement with previous studies&#44; <a class="elsevierStyleCrossRefs" href="#bib3">3&#44;5&#44;10&#44;21</a>in that VO<span class="elsevierStyleInf">2max</span> and maximum O<span class="elsevierStyleInf">2</span> pulse were within normal limits and were significantly higher in the second CPX &#40;p&#60;0&#46;05&#59; <a class="elsevierStyleCrossRefs" href="#tbl2">Table 2 and 3</a>&#41;&#46; Even though the purpose of our study was not to assess the influence of exercise training&#44; the higher values observed for VO<span class="elsevierStyleInf">2max</span> and maximum O<span class="elsevierStyleInf">2</span> pulse between tests probably occurred because of the training influence&#44; since almost all the subjects increased their physical activity levels&#46; In addition&#44; an effect due to counseling may have occurred since the remaining 25&#37; of the patients were underwent activity counseling after undergoing their initial CPX&#46;</p><p id="para160" class="elsevierStylePara elsevierViewall">A strong debate regarding the behavior of the SV response to progressive maximum exercise still exists&#46; <a class="elsevierStyleCrossRefs" href="#bib9">9&#44;22&#8211;24</a> Variations in these studies include a decrease&#44; <a class="elsevierStyleCrossRef" href="#bib25">25</a> a plateau <a class="elsevierStyleCrossRef" href="#bib26">26</a> or an increase in SV when approaching volitional exhaustion <a class="elsevierStyleCrossRef" href="#bib27">27</a> when untrained&#44; moderately trained or heart disease patients are considered&#46; <a class="elsevierStyleCrossRef" href="#bib24">24</a> The prospective design and complexity of methods for measuring SV in most studies has generally limited sample sizes&#44; and thus limited the external validity of the results&#46; In addition&#44; different testing protocols &#40;graded or constant&#41;&#44; type of ergometer &#40;treadmill or cycle&#41;&#44; criteria for termination of the test &#40;exhaustion or pre-determined &#37; of age-predicted maximum HR&#41; and also the lack of control of confounding variables such as body weight have limited the interpretation of previous results&#46; Our results support the concept that SV&#44; estimated by relative the O<span class="elsevierStyleInf">2</span> pulse response to maximum exercise&#44; increases in a linear fashion throughout exercise in non-athletes as shown by the high R<span class="elsevierStyleSup">2</span> &#40;<a class="elsevierStyleCrossRef" href="#tbl4">Table 4</a>&#41;&#46; A decrease or a plateau in relative O<span class="elsevierStyleInf">2</span> pulse would lead to a reduced R<span class="elsevierStyleSup">2</span> which was not the case in our results&#46; Our approach was novel in that we excluded the first minute of CPX to calculate the linearity and slopes of relative O<span class="elsevierStyleInf">2</span> pulse&#46; At the onset of a ramp protocol&#44; the lack of linearity in the intensity increment affects the linear increase of HR as a function of VO<span class="elsevierStyleInf">2</span> &#40;average R<span class="elsevierStyleSup">2</span> &#8200;&#61;&#8200; 0&#46;53 for both CPX&#41;&#46; <a class="elsevierStyleCrossRef" href="#bib28">28</a> As a consequence&#44; an artificial upward shift in O<span class="elsevierStyleInf">2</span> pulse slope occurs at the onset of exercise&#44; as seen in <a class="elsevierStyleCrossRef" href="#fig1">Figure 1</a> during the first 10&#37; of the test &#40;the slopes are visually different before and after the vertical line&#41;&#46; Thus&#44; excluding the first minute of the CPX has an advantage in that it allows the direct use of the O<span class="elsevierStyleInf">2</span> pulse slope&#44; obviating the need to calculate the VO<span class="elsevierStyleInf">2</span> and HR slopes&#46; Although linearity was present irrespective of quintile of maximum relative O<span class="elsevierStyleInf">2</span> pulse &#40;high R<span class="elsevierStyleSup">2</span> in all quintiles&#41; it is clear that the higher the slope of the relative O<span class="elsevierStyleInf">2</span> pulse&#44; the higher will be its linearity&#44; as demonstrated by the positive trend shown in the results of R<span class="elsevierStyleSup">2</span> among quintiles of relative O<span class="elsevierStyleInf">2</span> pulse &#40;<a class="elsevierStyleCrossRef" href="#tbl4">Table 4</a>&#41;&#46;</p><p id="para170" class="elsevierStylePara elsevierViewall">Data have recently emerged in regard to the association between the O<span class="elsevierStyleInf">2</span> pulse pattern during CPX and the presence of ischemia during exercise <a class="elsevierStyleCrossRefs" href="#bib5">5&#44;6&#44;29</a>&#46; Belardinelli et al&#46; <a class="elsevierStyleCrossRef" href="#bib5">5</a> studied 202 patients with known coronary heart disease who underwent both myocardial scintigraphy and cycle CPX&#46; By logistic regression analysis&#44; the only independent predictors of a positive myocardial scintigraphy were O<span class="elsevierStyleInf">2</span> pulse flattening duration &#40;calculated from the inflection point occurring in VO<span class="elsevierStyleInf">2</span> as related to work&#41; and the slope of VO<span class="elsevierStyleInf">2</span>&#47;workload&#46; The slope of VO<span class="elsevierStyleInf">2</span>&#47;workload was within normal limits from the start of exercise to a point corresponding to the onset of myocardial ischemia&#46; However&#44; as work rate increased further&#44; an inflection point was evident in most patients with detectable myocardial ischemia&#44; with the cutoff of 3&#46;9 mL&#46;min<span class="elsevierStyleSup">-1</span>&#46;watts<span class="elsevierStyleSup">-1</span> being the strongest independent predictor according to a hierarchical model&#46; Supporting these results&#44; Chaudhry et al&#46;&#44; <a class="elsevierStyleCrossRef" href="#bib29">29</a> showed that at the onset of myocardial ischemia&#44; a decrease in the O<span class="elsevierStyleInf">2</span> pulse with increasing work rate and a abrupt decrease in the slope of VO<span class="elsevierStyleInf">2</span>&#47;workload occurred in a 68 year old woman referred for CPX as part of a preoperative evaluation&#46; The O<span class="elsevierStyleInf">2</span> pulse patterns observed in these studies are most likely explained by reduced stroke volume at higher intensity exercise due to myocardial ischemia&#46; In contrast&#44; this was not the case in our relatively normal subjects&#44; since delta VO<span class="elsevierStyleInf">2</span>&#47;workload was within normal limits in all quintiles of maximum relative O<span class="elsevierStyleInf">2</span> pulse &#40;<a class="elsevierStyleCrossRef" href="#tbl3">Table 3</a>&#41; and the slopes were significantly different from zero &#40;<a class="elsevierStyleCrossRef" href="#tbl4">Table 4</a>&#41;&#46;</p><p id="para180" class="elsevierStylePara elsevierViewall">A novel finding shown by the present study was that&#44; after a median time of 15 months in between first and second CPXs&#44; the relative O<span class="elsevierStyleInf">2</span> pulse curve pattern remained unchanged as demonstrated by the lack of significant differences in slopes and intercepts regardless the maximum relative O<span class="elsevierStyleInf">2</span> pulse presented in each quintile &#40;<a class="elsevierStyleCrossRef" href="#tbl4">Table 4</a>&#41;&#46; The slopes and intercepts were similar despite the significantly higher values of VO<span class="elsevierStyleInf">2max</span> in second CPX in each quintile of maximum relative O<span class="elsevierStyleInf">2</span> pulse &#40;on average 1&#37; to 20&#37; higher on the second CPX&#41;&#46; This may have occurred because of the lower sub-maximal HR values during the second CPX&#44; as a result of the improved VO<span class="elsevierStyleInf">2max</span> &#40;possible training or counseling effect&#41;&#46; In fact&#44; three possible combinations of VO<span class="elsevierStyleInf">2</span> and HR kinetics may occur after a period of exercise training&#44; the first being that only the VO<span class="elsevierStyleInf">2</span> kinetics is modified with training&#44; the second being that only the HR kinetics is modified with training and the third being that both VO<span class="elsevierStyleInf">2</span> and HR kinetics are modified with training&#46; The first two cases imply that modifications of O<span class="elsevierStyleInf">2</span> pulse slope only mirrors the modification of VO<span class="elsevierStyleInf">2</span> or HR kinetics&#59; if such is the case&#44; the relevance of the O<span class="elsevierStyleInf">2</span> pulse kinetics is limited&#46; On the other hand&#44; as may have occurred in our study &#40;<a class="elsevierStyleCrossRefs" href="#tbl3">Tables 3 and 4</a>&#41;&#59; when both VO<span class="elsevierStyleInf">2</span> and HR kinetics are modified&#44; the O<span class="elsevierStyleInf">2</span> pulse kinetics do not correlate highly with any of these two variables&#46; The results for the O<span class="elsevierStyleInf">2</span> pulse slopes were similar when comparisons between the first and second CPXs were performed&#44; and were also similar when subsets of subjects were analyzed with known coronary artery disease and those taking beta-blockers&#44; which extend the clinical applications of our results to these subgroups&#46;</p><p id="para190" class="elsevierStylePara elsevierViewall">Finally&#44; our study adjusted O<span class="elsevierStyleInf">2</span> pulse by body weight&#46; Given the close relationship between SV and body dimensions&#44; <a class="elsevierStyleCrossRefs" href="#bib12">12&#44;13</a> consideration of body dimensions is necessary when evaluating the O<span class="elsevierStyleInf">2</span> pulse pattern to exercise&#46; Otherwise&#44; an obese subject might misleadingly have a superior O<span class="elsevierStyleInf">2</span> pulse response when compared&#44; for example&#44; to a lean marathoner&#46; To our knowledge&#44; few studies have taken into account the influence of weight on O<span class="elsevierStyleInf">2</span> pulse responses to exercise&#46; <a class="elsevierStyleCrossRefs" href="#bib30">30-32</a> This aspect has been an important limitation of both clinical <a class="elsevierStyleCrossRefs" href="#bib6">6&#44;14</a> and physiological studies&#46; <a class="elsevierStyleCrossRefs" href="#bib15">15&#44;16</a> In a study by Munhoz et al&#46;&#44;<a class="elsevierStyleCrossRef" href="#bib6">6</a> 87 patients underwent both myocardial scintigraphy and treadmill CPX in order to compare the O<span class="elsevierStyleInf">2</span> pulse response to incremental exercise in patients with and without ischemia as detected by myocardial scintigraphy&#46; Although a flattening of the O<span class="elsevierStyleInf">2</span> pulse response occurred in patients with extensive myocardial ischemia when compared to those with mild ischemia&#44; the authors concluded that O<span class="elsevierStyleInf">2</span> pulse responses during exercise were not able to discriminate those with and without myocardial ischemia&#46; Caution is in order&#44; however&#44; when interpreting these results&#44; since there were significant differences in the weight of the subjects&#44; which was heavier in those with ischemic responses&#46; It is possible then&#44; that patients with ischemic responses performed better in terms of O<span class="elsevierStyleInf">2</span> pulse simply because they were heavier&#46; Unfortunately&#44; the authors did not provide information on the relative O<span class="elsevierStyleInf">2</span> pulse responses&#44; which limits comparisons between subjects with different body weights&#46; The sub-maximal O<span class="elsevierStyleInf">2</span> pulse has also been reported to be similar between trained and untrained men&#44; when trained men were on average 14 kg lighter than untrained men&#46;<a class="elsevierStyleCrossRef" href="#bib16">16</a> Similarly&#44; O<span class="elsevierStyleInf">2</span> pulse was not significantly different between obese and leaner women when obese women were 18 kg heavier on average than leaner women&#46;<a class="elsevierStyleCrossRef" href="#bib15">15</a></p><p id="para200" class="elsevierStylePara elsevierViewall">Some limitations are of note in the present study&#46; Even though direct measurements of SV were not made&#44; collectively&#44; the evidence is convincing that O<span class="elsevierStyleInf">2</span> pulse correlates well with direct measurements of SV&#46; <a class="elsevierStyleCrossRefs" href="#bib11">11&#44;16&#44;21&#44;33&#44;34</a> According to the modified Fick equation&#44; O<span class="elsevierStyleInf">2</span> pulse equals the product of SV and arterio-venous oxygen difference&#46; Since the assessment of arterio-venous oxygen difference requires the placement of invasive catheters&#44; we assumed that arterio-venous oxygen difference increases in a predictable way with respect to workload&#44; reaching an approximate constant peak value at close to maximal intensity&#46;<a class="elsevierStyleCrossRefs" href="#bib25">25&#44;35</a> Therefore&#44; after the point where arterio-venous oxygen difference tends to reach its maximum value&#44; any further increase in O<span class="elsevierStyleInf">2</span> pulse will reflect changes in SV&#46; Finally&#44; although the aim of the present study was not to assess the influence of exercise training of key dependent variables&#44; we cannot exclude the possible influence of the supervised exercise program or counseling on our results&#46; Considering all the above&#44; some caution should be made when interpreting the results of the present study&#46;</p><span id="cesec90" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle150">Clinical implications</span><p id="para210" class="elsevierStylePara elsevierViewall">The novelty of our study lays in the fact that it was the first study to demonstrate the stability of O<span class="elsevierStyleInf">2</span> pulse&#46; By showing the O<span class="elsevierStyleInf">2</span> pulse curve stability after a median time of 15 months in subjects under similar clinical conditions and drug regimens&#44; we reject the hypothesis that factors such as measurement variability inherent to any test &#40;in our case CPX&#41;&#44; could affect the O<span class="elsevierStyleInf">2</span> pulse pattern&#46; This increases in importance considering the established association between O<span class="elsevierStyleInf">2</span> pulse curve pattern and myocardial ischemia&#46; In other words&#44; if such variability in the O<span class="elsevierStyleInf">2</span> pulse curve pattern was present&#44; rejecting our hypothesis&#44; it could be difficult to discriminate those with a flat O<span class="elsevierStyleInf">2</span> pulse curve truly caused by myocardial ischemia from those with a flat curve caused just by variations in measurements inherent to CPX&#46;</p></span></span><span id="cesec100" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle160">CONCLUSIONS</span><p id="para220" class="elsevierStylePara elsevierViewall">After excluding the first minute of CPX &#40;rest-exercise transition&#41;&#44; the relative O<span class="elsevierStyleInf">2</span> pulse exhibited a linear increase throughout maximum exercise&#46; In addition&#44; in a test-retest design&#44; where subjects served as their own controls&#44; the pattern of relative O<span class="elsevierStyleInf">2</span> pulse remained stable&#46;</p></span></span>"
    "textoCompletoSecciones" => array:1 [
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        0 => array:2 [
          "identificador" => "xpalclavsec1581452"
          "titulo" => "KEYWORDS"
        ]
        1 => array:2 [
          "identificador" => "cesec10"
          "titulo" => "INTRODUCTION"
        ]
        2 => array:3 [
          "identificador" => "cesec20"
          "titulo" => "MATERIALS AND METHODS"
          "secciones" => array:4 [
            0 => array:2 [
              "identificador" => "cesec30"
              "titulo" => "Study Population"
            ]
            1 => array:2 [
              "identificador" => "cesec40"
              "titulo" => "Cardiopulmonary Exercise Testing &#40;CPX&#41;"
            ]
            2 => array:2 [
              "identificador" => "cesec50"
              "titulo" => "Hemodynamic and Ventilatory Assessments"
            ]
            3 => array:2 [
              "identificador" => "cesec60"
              "titulo" => "Data management and statistical analyses"
            ]
          ]
        ]
        3 => array:2 [
          "identificador" => "cesec70"
          "titulo" => "RESULTS"
        ]
        4 => array:3 [
          "identificador" => "cesec80"
          "titulo" => "DISCUSSION"
          "secciones" => array:1 [
            0 => array:2 [
              "identificador" => "cesec90"
              "titulo" => "Clinical implications"
            ]
          ]
        ]
        5 => array:2 [
          "identificador" => "cesec100"
          "titulo" => "CONCLUSIONS"
        ]
        6 => array:2 [
          "identificador" => "xack638843"
          "titulo" => "ACKNOWLEDGMENTS"
        ]
        7 => array:1 [
          "titulo" => "REFERENCES"
        ]
      ]
    ]
    "pdfFichero" => "main.pdf"
    "tienePdf" => true
    "fechaRecibido" => "2010-10-13"
    "fechaAceptado" => "2010-10-27"
    "PalabrasClave" => array:1 [
      "en" => array:1 [
        0 => array:4 [
          "clase" => "keyword"
          "titulo" => "KEYWORDS"
          "identificador" => "xpalclavsec1581452"
          "palabras" => array:4 [
            0 => "Stroke Volume"
            1 => "Coronary Artery Disease"
            2 => "Cardiopulmonary Exercise Testing&#44; Heart Rate"
            3 => "Ramp Protocol"
          ]
        ]
      ]
    ]
    "tieneResumen" => true
    "resumen" => array:1 [
      "en" => array:2 [
        "resumen" => "<span id="ceabs10" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle10">INTRODUCTION</span><p id="spara100" class="elsevierStyleSimplePara elsevierViewall">Exercise oxygen pulse &#40;O<span class="elsevierStyleInf">2</span> pulse&#41;&#44; a surrogate for stroke volume and arteriovenous oxygen difference&#44; has emerged as an important variable obtained during cardiopulmonary exercise testing&#46;</p></span> <span id="ceabs20" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle20">OBJECTIVES</span><p id="spara110" class="elsevierStyleSimplePara elsevierViewall">We hypothesized that the O<span class="elsevierStyleInf">2</span> pulse curve pattern response to a maximal cycling ramp protocol exhibits a stable linear pattern in subjects reevaluated under the same clinical conditions&#46;</p></span> <span id="ceabs30" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle30">METHODS</span><p id="spara120" class="elsevierStyleSimplePara elsevierViewall">We retrospectively studied 100 adults &#40;80 males&#41;&#44; mean age at baseline of 59 &#177; 12 years&#44; who performed two cardiopulmonary exercise testings &#40;median interval was 15 months&#41;&#44; for clinical and&#47;or exercise prescription reasons&#46; The relative O<span class="elsevierStyleInf">2</span> pulse was calculated by dividing its absolute value by body weight&#46; Subjects were classified into quintiles of relative O<span class="elsevierStyleInf">2</span> pulse&#46; Cardiopulmonary exercise testing results and the O<span class="elsevierStyleInf">2</span> pulse curve pattern&#44; expressed by its slope and intercept&#44; were compared among quintiles of relative O<span class="elsevierStyleInf">2</span> pulse at both cardiopulmonary exercise testings&#46;</p></span> <span id="ceabs40" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle40">RESULTS</span><p id="spara130" class="elsevierStyleSimplePara elsevierViewall">After excluding the first minute of CPX &#40;rest-exercise transition&#41;&#44; the relative O<span class="elsevierStyleInf">2</span> pulse curve exhibited a linear increase&#44; as demonstrated by high coefficients of determination &#40;R<span class="elsevierStyleSup">2</span> from 0&#46;75 to 0&#46;90&#59; p&#60;0&#46;05 for all quintiles&#41;&#46; Even though maximum oxygen uptake and relative O<span class="elsevierStyleInf">2</span> pulse were significantly higher in the second cardiopulmonary exercise testing for each quintile of relative O<span class="elsevierStyleInf">2</span> pulse &#40;p&#60;0&#46;05 for all comparisons&#41;&#44; no differences were found when slopes and intercepts were compared between the first and second cardiopulmonary exercise testings &#40;p&#62;0&#46;05 for all comparisons&#59; except for intercept in the 5<span class="elsevierStyleSup">th</span> quintile&#41;&#46;</p></span> <span id="ceabs50" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle50">CONCLUSION</span><p id="spara140" class="elsevierStyleSimplePara elsevierViewall">Excluding the rest-exercise transition&#44; the relative O<span class="elsevierStyleInf">2</span> pulse exhibited a stable linear increase throughout maximal exercise in adults that were retested under same clinical conditions&#46;</p></span>"
        "secciones" => array:5 [
          0 => array:2 [
            "identificador" => "ceabs10"
            "titulo" => "INTRODUCTION"
          ]
          1 => array:2 [
            "identificador" => "ceabs20"
            "titulo" => "OBJECTIVES"
          ]
          2 => array:2 [
            "identificador" => "ceabs30"
            "titulo" => "METHODS"
          ]
          3 => array:2 [
            "identificador" => "ceabs40"
            "titulo" => "RESULTS"
          ]
          4 => array:2 [
            "identificador" => "ceabs50"
            "titulo" => "CONCLUSION"
          ]
        ]
      ]
    ]
    "multimedia" => array:5 [
      0 => array:7 [
        "identificador" => "fig1"
        "etiqueta" => "Figure 1"
        "tipo" => "MULTIMEDIAFIGURA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "figura" => array:1 [
          0 => array:4 [
            "imagen" => "gr1.jpeg"
            "Alto" => 261
            "Ancho" => 420
            "Tamanyo" => 18743
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        "descripcion" => array:1 [
          "en" => "<p id="spara10" class="elsevierStyleSimplePara elsevierViewall">First and second quintiles of relative O<span class="elsevierStyleInf">2</span> pulse during CPX&#46; Triangles &#40;&#9652;&#41; stand for results obtained in the first CPX&#46; Closed circles &#40;&#8226;&#41; stand for results obtained in the second CPX&#46; The vertical line highlights the linearity of the curves after exclusion of the first 10&#37; of the CPX time&#46; All results of relative O<span class="elsevierStyleInf">2</span> pulse were multiplied by 100&#46; The exercise responses and slopes for each quintile are shown in <a class="elsevierStyleCrossRefs" href="#tbl3">tables 3 and 4</a>&#46; Q&#44; quintiles&#59; CPX&#44; cardiopulmonary exercise testing&#46; No significant differences were found when both CPX in each quintile were compared &#40;p&#62;0&#46;05 for all comparisons&#41;&#46;</p>"
        ]
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      1 => array:7 [
        "identificador" => "tbl1"
        "etiqueta" => "Table 1"
        "tipo" => "MULTIMEDIATABLA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "tabla" => array:2 [
          "leyenda" => "<p id="spara30" class="elsevierStyleSimplePara elsevierViewall">CABG&#44; coronary artery bypass graft&#59; PTCA&#44; percutaneous transluminal coronary angioplasty&#59; Q&#44; quintile&#59; &#42; p &#60; 0&#46;05 vs&#46; Q1&#59; &#8224; p&#60;0&#46;05 vs&#46; Q2&#59; &#8225; p&#60;0&#46;05 vs&#46; Q3&#46;</p>"
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                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">All &#40;n&#8200;&#61;&#8200;100&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col">Q1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col">Q2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
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                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col">Q3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col">Q4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
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                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col">Q5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr><tr title="table-row"><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t" scope="col">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
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                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col">&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
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                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">N&#47;&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col">N&#47;&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
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                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col">N&#47;&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
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                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col">N&#47;&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
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                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col">N&#47;&#37;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Medications</span>Beta blockers&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">41&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5&#47;20&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">10&#47;50&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">5&#47;20&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">12&#47;60&#42;&#8225;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">9&#47;45&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Calcium channel blockers&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">16&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">4&#47;20&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">4&#47;20&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">4&#47;20&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">3&#47;15&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">1&#47;5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Nitrates&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">10&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">2&#47;10&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">2&#47;10&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">1&#47;5&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">4&#47;20&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">1&#47;5&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>ACE-inhibitors&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">14&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">2&#47;10&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">3&#47;15&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">7&#47;35&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">2&#47;10&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Diuretics&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">12&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">6&#47;30&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">2&#47;10&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">3&#47;15&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">1&#47;5&#42;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Statins&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">63&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">12&#47;60&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">16&#47;80&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">13&#47;65&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">13&#47;65&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">9&#47;45&#8224;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="7" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Risk factors</span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Hypertension&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">43&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">8&#47;40&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">10&#47;50&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">9&#47;45&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">9&#47;45&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">7&#47;35&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Dyslipidemia&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">50&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">9&#47;45&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">12&#47;60&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">10&#47;50&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">11&#47;55&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">8&#47;40&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Diabetes&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">13&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&#47;5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">4&#47;20&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">3&#47;15&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">5&#47;25&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Obesity &#40;BMI &#8805; 30 kg&#47;m<span class="elsevierStyleSup">2</span>&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">14&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">3&#47;15&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">3&#47;15&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">3&#47;15&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">3&#47;15&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">2&#47;10&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="7" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Medical history&#47;Procedures</span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Apparently healthy&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">29&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">7&#47;35&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">2&#47;10&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5&#47;25&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">6&#47;30&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">9&#47;45&#8224;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Coronary Artery Disease&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">50&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">8&#47;40&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">13&#47;65&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">10&#47;50&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">12&#47;60&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">7&#47;35&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>CABG&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">26&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">4&#47;20&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">9&#47;45&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">6&#47;30&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5&#47;25&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">2&#47;10&#8224;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black"><span class="elsevierStyleHsp" style=""></span>PTCA&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">26&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">3&#47;15&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">6&#47;30&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">7&#47;35&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">6&#47;30&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">4&#47;20&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
              ]
            ]
          ]
        ]
        "descripcion" => array:1 [
          "en" => "<p id="spara20" class="elsevierStyleSimplePara elsevierViewall">Baseline clinical characteristics by quintiles of maximum relative O<span class="elsevierStyleInf">2</span> pulse&#46;</p>"
        ]
      ]
      2 => array:7 [
        "identificador" => "tbl2"
        "etiqueta" => "Table 2"
        "tipo" => "MULTIMEDIATABLA"
        "mostrarFloat" => true
        "mostrarDisplay" => false
        "tabla" => array:2 [
          "leyenda" => "<p id="spara50" class="elsevierStyleSimplePara elsevierViewall">Values are mean &#177; SEM&#46; VO<span class="elsevierStyleInf">2</span>&#44; oxygen uptake&#59; O<span class="elsevierStyleInf">2</span>&#44; oxygen&#46;</p>"
          "tablatextoimagen" => array:1 [
            0 => array:1 [
              "tabla" => array:1 [
                0 => """
                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">VARIABLE N &#8200;&#61;&#8200; 100&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">First CPX&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">Second CPX&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">p-value&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="4" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Demographic characteristics</span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Age &#40;yr&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">59 &#177; 1&#46;2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">60 &#177; 1&#46;3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Body mass index &#40;kg&#47;m<span class="elsevierStyleSup">2</span>&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">26&#46;9 &#177; 0&#46;4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">26&#46;9 &#177; 0&#46;4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;82&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Height &#40;cm&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">170&#46;4 &#177; 0&#46;9&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">170&#46;5 &#177; 0&#46;9&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;14&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Weight &#40;kg&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">78&#46;4 &#177; 1&#46;3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">78&#46;5 &#177; 1&#46;4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;76&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="4" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Resting Values</span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Heart rate &#40;beats&#47;min&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">63 &#177; 1&#46;1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">60 &#177; 1&#46;3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;01&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Blood pressure &#40;mm Hg&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Systolic&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">133 &#177; 1&#46;5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">127 &#177; 2&#46;3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;02&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Diastolic&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">77 &#177; 1&#46;0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">72 &#177; 1&#46;4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="4" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Maximum Values</span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Heart rate &#40;beats&#47;min&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">144 &#177; 2&#46;6&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">144 &#177; 2&#46;5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;53&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Blood pressure &#40;mm Hg&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Systolic&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">201 &#177; 3&#46;1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">207 &#177; 2&#46;6&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;009&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Diastolic&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">91 &#177; 1&#46;3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">91 &#177; 1&#46;3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;53&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>VO<span class="elsevierStyleInf">2</span> &#40;mL&#46;kg<span class="elsevierStyleSup">-1</span>&#46;min<span class="elsevierStyleSup">-1</span>&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">25&#46;1 &#177; 1&#46;0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">28&#46;2 &#177; 1&#46;0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>O<span class="elsevierStyleInf">2</span> pulse &#40;mL&#46;beat<span class="elsevierStyleSup">-1</span>&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">13&#46;7 &#177; 0&#46;5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">15&#46;2 &#177; 0&#46;5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Relative O<span class="elsevierStyleInf">2</span> pulse &#40;mL&#46;beat<span class="elsevierStyleSup">-1</span>&#46;kg<span class="elsevierStyleSup">-1</span>&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">17&#46;4 &#177; 0&#46;5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">19&#46;3 &#177; 0&#46;5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>&#37; achieved of age predicted O<span class="elsevierStyleInf">2</span> pulse&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">110 &#177; 3&#46;2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">128 &#177; 3&#46;3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Workload &#40;watts&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">133 &#177; 6&#46;1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">150 &#177; 6&#46;7&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Delta VO<span class="elsevierStyleInf">2</span>&#47;workload &#40;mL&#46;min<span class="elsevierStyleSup">-1</span>&#46;watts<span class="elsevierStyleSup">-1</span>&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">12&#46;9 &#177; 0&#46;22&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">13&#46;2 &#177; 0&#46;31&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;14&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black"><span class="elsevierStyleBold">Exercise duration</span> &#40;minutes&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top" style="border-bottom: 2px solid black">10 &#177; 0&#46;2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top" style="border-bottom: 2px solid black">11 &#177; 0&#46;2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
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                  """
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      3 => array:7 [
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                0 => """
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t" scope="col">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">Body Weight&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">Maximum heart rate&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">Maximum O<span class="elsevierStyleInf">2</span> pulse&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">Maximum relative O<span class="elsevierStyleInf">2</span> pulse&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">Delta VO<span class="elsevierStyleInf">2</span>&#47;workload&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t" scope="col">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col">&#40;kg&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" scope="col">&#40;mL&#46;kg<span class="elsevierStyleSup">-1</span>&#46;min<span class="elsevierStyleSup">-1</span>&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
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                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t" scope="col">&#40;beats&#46;min<span class="elsevierStyleSup">-1</span>&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" scope="col">&#40;mL&#46;beat<span class="elsevierStyleSup">-1</span>&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" scope="col">&#40;mL&#46;beat<span class="elsevierStyleSup">-1&#46;</span>kg<span class="elsevierStyleSup">-1</span>&#41;&#42;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" scope="col">&#40;mL&#46;min<span class="elsevierStyleSup">-1</span>&#46;watts<span class="elsevierStyleSup">-1</span>&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleBold">Q1 &#40;n&#8200;&#61;&#8200;20&#41;</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>First CPX&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">74&#46;2 &#177; 3&#46;6&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">16&#46;4 &#177; 0&#46;6&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">143 &#177; 4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">8&#46;6 &#177; 0&#46;4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">11&#46;6 &#177; 0&#46;3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">12&#46;1 &#177; 0&#46;6&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Second CPX&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">74&#46;1 &#177; 3&#46;7&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">20&#46;2 &#177; 1&#46;0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">143 &#177; 4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">10&#46;6 &#177; 0&#46;6&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">14&#46;3 &#177; 0&#46;6&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">13&#46;3 &#177; 0&#46;7&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Q2 &#40;n&#8200;&#61;&#8200;20&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>First CPX&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">75&#46;2 &#177; 3&#46;3&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">19&#46;5 &#177; 1&#46;0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">138 &#177; 7&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">10&#46;8 &#177; 0&#46;5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">14&#46;3 &#177; 0&#46;1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">12&#46;5 &#177; 0&#46;4&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Second CPX&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">74&#46;9 &#177; 3&#46;6&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>First CPX&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Second CPX&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>First CPX&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Second CPX&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>First CPX&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Second CPX&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">40&#46;3 &#177; 2&#46;6&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">160 &#177; 6&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Quintile factor&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;018&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;002&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;021&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>CPX factor&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;949&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;004&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#60;0&#46;843&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;002&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;312&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black"><span class="elsevierStyleHsp" style=""></span>Interaction&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">0&#46;998&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">0&#46;740&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">0&#46;999&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">0&#46;601&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">0&#46;113&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="center" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">0&#46;687&nbsp;\t\t\t\t\t\t\n
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                  """
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          "leyenda" => "<p id="spara90" class="elsevierStyleSimplePara elsevierViewall">R<span class="elsevierStyleSup">2</span>&#44; coefficient of determination for correlation between Relative O<span class="elsevierStyleInf">2</span> Pulse and CPX duration&#59; CI&#44; Confidence interval&#59; Q&#44; quintile&#46; &#42; Slopes significantly different from zero &#40;p&#60;0&#46;05&#41;&#46;</p>"
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                  \t\t\t\t" scope="col">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" scope="col">R<span class="elsevierStyleSup">2</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" scope="col">Slope&#42; &#40;95&#37; CI&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
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                  \t\t\t\t" scope="col">Slope p-value 1st vs 2nd CPX&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" scope="col">Intercept &#40;95&#37; CI&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">Intercept p-value 1st vs 2nd CPX&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleBold">Q1</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>First CPX&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;78&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;61 &#40;0&#46;47 - 0&#46;76&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;57&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">6&#46;9 &#40;5&#46;8 - 8&#46;0&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;22&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Second CPX&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;79&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;68 &#40;0&#46;50 - 0&#46;85&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">0&#46;04&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">8&#46;1 &#40;9&#46;1 - 12&#46;3&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Q2</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>First CPX&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;75&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;62 &#40;0&#46;43 - 0&#46;80&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;003&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;37&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">9&#46;4 &#40;8&#46;3 - 10&#46;5&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;13&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Second CPX&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;78&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>First CPX&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&#46;68 &#40;0&#46;51 - 0&#46;85&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">10&#46;3 &#40;9&#46;1 - 11&#46;5&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&#46;79 &#40;0&#46;63 - 0&#46;95&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">10&#46;5 &#40;8&#46;7 - 12&#46;4&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>First CPX&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&#46;88 &#40;0&#46;70 - 1&#46;05&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">11&#46;1 &#40;9&#46;7 - 12&#46;5&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>First CPX&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&#46;99 &#40;0&#46;82 - 1&#46;15&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="center" valign="\n
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                  \t\t\t\t">-&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&#46;12&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">12&#46;8 &#40;10&#46;9 - 14&#46;6&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&#46;007&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black"><span class="elsevierStyleHsp" style=""></span>Second CPX&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">0&#46;89&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">0&#46;85 &#40;0&#46;66 - 1&#46;03&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">-&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" style="border-bottom: 2px solid black">15&#46;4 &#40;13&#46;6 - 17&#46;1&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
              ]
            ]
          ]
        ]
        "descripcion" => array:1 [
          "en" => "<p id="spara80" class="elsevierStyleSimplePara elsevierViewall">Linear regression results by quintiles of maximum relative O<span class="elsevierStyleInf">2</span> pulse&#46;</p>"
        ]
      ]
    ]
    "bibliografia" => array:2 [
      "titulo" => "REFERENCES"
      "seccion" => array:1 [
        0 => array:2 [
          "identificador" => "cebibsec10"
          "bibliografiaReferencia" => array:35 [
            0 => array:3 [
              "identificador" => "bib1"
              "etiqueta" => "1"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Cardiac Output during Submaximal and Maximal Work"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:4 [
                            0 => """
                              PO Astrand \n
                              \t\t\t\t\t\t\t\t
                              """
                            1 => """
                              TE Cuddy \n
                              \t\t\t\t\t\t\t\t
                              """
                            2 => """
                              B Saltin \n
                              \t\t\t\t\t\t\t\t
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        "texto" => "<p id="para230" class="elsevierStylePara elsevierViewall">Ricardo Oliveira was supported by FAPERJ &#40;Brazil&#41;&#46; Claudio Gil Ara&#250;jo is a recipient of research fellowships from CAPES and FAPERJ &#40;Brazil&#41;</p>"
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Article information

ISSN: 18075932
Original language: English

DOI:10.1590/S1807-59322011000200004

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