TY - JOUR
T1 - Effects of low- and high-intensity exercise training on body composition and substrate metabolism in obese adolescents
AU - Lazzer, S.
AU - Lafortuna, C.
AU - Busti, C.
AU - Galli, R.
AU - Agosti, F.
AU - Sartorio, A.
PY - 2011/1
Y1 - 2011/1
N2 - 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′;O2max)] 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/m2; 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 (p2max, expressed in relative values, changed significantly only in the HI group by +0.010±0.006 l/(kg fat-free mass x 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′O2max) 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.
AB - 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′;O2max)] 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/m2; 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 (p2max, expressed in relative values, changed significantly only in the HI group by +0.010±0.006 l/(kg fat-free mass x 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′O2max) 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.
KW - Body composition
KW - Energy metabolism
KW - Exercise intensity
KW - Fat metabolism
KW - Obesity
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U2 - 10.3275/7238
DO - 10.3275/7238
M3 - Article
C2 - 20808072
AN - SCOPUS:79955456228
VL - 34
SP - 45
EP - 52
JO - Journal of Endocrinological Investigation
JF - Journal of Endocrinological Investigation
SN - 0391-4097
IS - 1
ER -