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BioMed Research International
Volume 2013 (2013), Article ID 618595, 8 pages
http://dx.doi.org/10.1155/2013/618595
Clinical Study

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

1Faculty of Sport Sciences and Physical Education, University of Coimbra, 3040-156 Coimbra, Portugal
2Department of Physical Education, Federal University of Paraná, 81690-100 Curitiba, PR, Brazil
3Department of Physical Education, State University of Campinas, 13083-851 Campinas, SP, Brazil
4Pediatric Endocrinology Unit, Department of Nutrition, Federal University of Paraná, 80210-170 Curitiba, PR, Brazil

Received 21 April 2013; Revised 21 June 2013; Accepted 24 June 2013

Academic Editor: Konstantinos Kantartzis

Copyright © 2013 Humberto M. Carvalho et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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 ( ; 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 ( ) in the initial models were and for body mass and fat-free mass, respectively. The coefficients decreased when age was considered ( for body mass; 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.