title: Peak oxygen uptake responses to training in obese adolescents: a multilevel allometric framework to partition the influence of body size and maturity status.
abstract: The influence of body size and maturation on the responses in peak oxygen uptake (VO2) 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 VO2, 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 VO2, 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 VO2 may be mediated by the changes in body dimensions.
authors: Faculty of Sport Sciences and Physical Education, University of Coimbra, 3040-156 Coimbra, Portugal. hmoreiracarvalho@gmail.com
authors: Humberto M
authors: HM
authors: Carvalho
authors: Gerusa E
authors: GE
authors: Milano
authors: Wendell A
authors: WA
authors: Lopes
authors: António J
authors: AJ
authors: Figueiredo
authors: Rosana B
authors: RB
authors: Radominski
authors: Neiva
authors: N
authors: Leite
mesh_terms: D000293:Adolescent; D000886:Anthropometry; D015992:Body Mass Index; D049628:Body Size; D004035:Diet Therapy; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D009765:Obesity / Q000178:diet therapy / Q000378:metabolism* / Q000503:physiopathology; D010100:Oxygen / Q000378:metabolism*; D010101:Oxygen Consumption / Q000502:physiology*; D055105:Waist Circumference
chemical_list: D010100:Oxygen
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