Effects of low- and high-intensity exercise training on body composition and substrate metabolism in obese adolescents.
The objective was to investigate the effects of a 3- week weight-management program including moderate energy restriction and exercise training at 2 intensities [low intensity (LI): 40% and high intensity (HI): 70% maximal oxygen uptake (V'O(2)max)] on body composition, energy expenditure, and fat oxidation rate in severely obese adolescents. Twenty obese adolescents, aged 15-17 yr (body mass index: 37.5 kg/m(2); 38.2% fat mass) participated in this study. Before starting (week 0, W0) and at the end of the weight-management period (week 3,W3), body composition was assessed by a multifrequency tetrapolar impedancemeter; basal metabolic rate (BMR), energy expenditure, and substrate oxidation rate during exercise and post-exercise recovery by indirect calorimetry. At W3, body mass and fat mass decreased significantly (p<0.005) in all groups, and the decreases were significantly greater in the LI than in the HI group (-8.1±1.6 vs -5.9±1.6 kg and -4.2±1.9 vs -2.3±1.7 kg, p<0.05, respectively). Predicted V'O(2)max, expressed in relative values, changed significantly only in the HI group by +0.010±0.006 l/(kg fat-free mass × min) (p=0.010). By contrast, no significant changes were observed at W3 in BMR, energy expenditure, and substrate oxidation rate during exercise and post-exercise recovery. In conclusion, LI (40% of V'O(2)max) physical activity favors fat oxidation and it seems advisable to encourage obese adolescents to perform LI physical activity which is more feasible and acceptable than intense exercise.
Lazzer
S
S
Istituto Auxologico Italiano, IRCCS, Laboratorio Sperimentale di Ricerche Auxo-Endocrinologiche, Via Ariosto, 13-20145 Milan, Italy.
Lafortuna
C
C
Busti
C
C
Galli
R
R
Agosti
F
F
Sartorio
A
A
D000293:Adolescent; D001823:Body Composition / Q000502:physiology*; D015992:Body Mass Index; D050260:Carbohydrate Metabolism / Q000502:physiology; D004734:Energy Metabolism / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D005081:Exercise Therapy / Q000379:methods; D006801:Humans; D050356:Lipid Metabolism / Q000502:physiology; D008297:Male; D009043:Motor Activity / Q000502:physiology; D009765:Obesity / Q000378:metabolism* / Q000503:physiopathology / Q000628:therapy; D010084:Oxidation-Reduction; D020127:Recovery of Function / Q000502:physiology
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