Effects of puberty on glucose-lipid balance during exercise in the obese child

The aim of the present study was to investigate effect of puberty on substrate oxidation rates using a graded exercise test to exhaustion. Two groups of obese adolescent males (34 prepubertal: body mass index (BMI) = 25,94 +/- 2,63; Z-score = 4,43 +/- 1,83; and 26 postpubertal: BMI = 31,14 +/- 4,88;...

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Published in:Applied physiology, nutrition, and metabolism nutrition, and metabolism, 2006-08, Vol.31 (4), p.442-448
Main Authors: Zunquin, Gautier, Theunynck, Denis, Sesboüé, Bruno, Arhan, Pierre, Bouglé, Dominique
Format: Article
Language:fre
Subjects:
Adolescent
Body Mass Index
Energy Metabolism - physiology
Exercise - physiology
Exercise Test
Glucose - metabolism
Humans
Kinetics
Lipid Metabolism - physiology
Male
Obesity - physiopathology
Oxidation-Reduction
Oxygen Consumption
Puberty - physiology
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Summary:The aim of the present study was to investigate effect of puberty on substrate oxidation rates using a graded exercise test to exhaustion. Two groups of obese adolescent males (34 prepubertal: body mass index (BMI) = 25,94 +/- 2,63; Z-score = 4,43 +/- 1,83; and 26 postpubertal: BMI = 31,14 +/- 4,88; Z-score = 5,264 +/- 1,76) performed an exercise test on a cycle ergometer. The test consisted in a series of graded exercises on a cycle ergometer. Stage duration was 3 min 30 s. Fat and carbohydrate rates were calculated during the last 30 s of each stage using stoichiometric equations, and this permitted us to calculate substrate oxidation according to exercise intensity. Lipid oxidation rates are significantly higher in the postpubertal group. When the fat oxidation rates are reported relative to fat free mass, fat oxidation rates are higher in the prepubertal group. Puberty decreases significantly the capacity of fat free mass to oxidize fat for a same level of exercise.
ISSN:1715-5312