Why the study?
Does cardiac functional reserve during exercise differ between college men and prepubertal boys?
Does cardiac functional reserve during exercise differ between college men and prepubertal boys?
Prepubertal boys exhibit inferior myocardial function and limited cardiac functional reserve during exercise compared to young adults.
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Differences in post-exercise cardiac reserve warrant no practice change; leaves open whether maturation or selection drives findings in this cross-sectional sample.
Previous reports have suggested that children possess limited cardiac functional reserve during exercise compared to young adults. In this study, echocardiography was performed immediately after maximal treadmill exercise to measure left ventricular dimensions and shortening fraction (SF) in college men, and these values were compared to previous results in a post-exercise echocardiographic study of prepubertal boys. Post-exercise SF, change in SF from rest, and percent change in SF from rest were all significantly greater in the post-pubertal subjects. In both men and boys changes in SF following exercise were related to reductions in left ventricular end-systolic dimension, with only minor reductions observed in end-diastolic dimension. These findings support the concept that prepubertal subjects may have inferior myocardial function with exercise when compared to young adults.
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Rowland et al. (1990) studied this question.
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