Effect of time interval between food intake and exercise on substrate oxidation during exercise in obese and lean children |
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Authors: | Aucouturier Julien Isacco Laurie Thivel David Fellmann Nicole Chardigny Jean-Michel Duclos Martine Duché Pascale |
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Institution: | aLaboratoire Universitaire de Biologie des Activités Physiques et Sportives (BAPS), Université Blaise Pascal, Clermont-Ferrand, Batiment de Biologie B, Campus Universitaire des Cézeaux, 63177 Aubière Cedex, France;bUniversité Droit et Santé Lille 2, EA 4488 "Activité Physique, Muscle, Santé", Faculté des Sciences du Sport et de l’Education Physique, 59790 Ronchin, France;cINRA, UMR 1019 Nutrition Humaine, F-63122, Saint Genès Champanelle, France;dClermont Université, UFR Médecine, UMR 1019 Nutrition Humaine and Centre Hospitalier Universitaire (CHU) de Clermont-Ferrand, Service de Médecine du Sport et des Explorations Fonctionnelles, Hôpital G. Montpied, Clermont-Ferrand, France CHU - 58 Rue Montalembert BP 69, 63003 Clermont-Ferrand Cedex 1, France |
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Abstract: | Background & aimsExercise induces adaptations in fat metabolism favourable to the treatment of obesity. However, time interval between meal and exercise alters substrate bioavailability and oxidation during exercise. The aim of this study was therefore to investigate the effect of time interval between food intake and exercise on substrate oxidation rates in obese and lean children.MethodsThe metabolic responses to exercise of nine obese children (10.3 ± 1.8 years; %body fat: 36.1 ± 6.1) and seven lean children (9.2 ± 1.6 years; %body fat: 22.2 ± 4.1) were compared 1 h (time interval 1, TI1) and 3 h (TI3) after a standardized breakfast.ResultsDespite significantly lower plasma glucose and insulin concentrations and large effect size suggesting a higher plasma FFA availability (lean, 1.43, obese 0.98), fat oxidation was not significantly increased in TI3 compared to TI1 in both lean and obese children. Fat oxidation contributed marginally to energy expenditure during exercise (<20%) in both conditions and groups but was moderately increased during TI3 compared to TI1 in lean children (effect size: 0.54).ConclusionsThe low contribution of fat oxidation to energy expenditure during exercise in obese and lean children fed 3 h before exercise questions the efficacy of moderate intensity exercise to favourably affect fat balance. |
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Keywords: | Exercise Substrate oxidation Children Obesity Insulin Food intake |
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