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The influence of body size and maturation on the responses in peak oxygen uptake (VO 2 ) to a 12-week aerobic training and nutritional intervention in obese boys ( n  = 30; 10–16 years) was examined using multilevel allometric regressions. Anthropometry, sexual maturity status, peak VO 2 , and body composition were measured pre- and postintervention. Significant decrements for body mass, body mass index  z -score, and waist circumference and increments for stature, fat-free mass, and peak oxygen uptake were observed after intervention. Partitioning body size on peak VO 2 , the responses of the individuals to training were positive (11.8% to 12.7% for body mass; 7.6% to 8.1% for fat-free mass). Body mass and fat-free mass were found as significant explanatory variables, with an additional positive effect for chronological. The allometric coefficients ( k ′) in the initial models were  k ′ = 0.883 and  k ′ = 1.058 for body mass and fat-free mass, respectively. The coefficients decreased when age was considered ( k ′ = 0.530 for body mass;  k ′ = 0.860 for fat-free mass). Including maturity indicator in the models was not significant, thus the influence of variability in sexual maturity status in responses to exercise-based intervention in peak VO 2  may be mediated by the changes in body dimensions.

biomed research international

Peak Oxygen Uptake Responses to Training in Obese Adolescents: A Multilevel Allometric Framework to Partition the Influence of Body Size and Maturity Status