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1 Laboratoire des Adaptations
de l'Organisme à l'Exercice Musculaire, Service
d'Exploration de la Fonction Respiratoire et de Médecine du
Sport, Centre Hospitalier Universitaire Purpan, 31059 Toulouse Cedex,
France; 2 Département des
Sciences de l'Activite Physique, Université du Quebec
à Trois-Rivières, Trois-Rivières, Quebec, Canada G9A
5H7; 3 Laboratoire de Physiologie
de l'Environnement,
To study whether sucrose administration acts on lipid mobilization during prolonged exercise, we used subcutaneous abdominal adipose tissue microdialysis in eight well-trained subjects submitted at random to two 100-min exercises (50% maximal aerobic power) on separate days. After 50 min of exercise, the subjects ingested either a sucrose solution (0.75 g/kg body wt) or water. By using a microdialysis probe, dialysate was obtained every 10 min from the subjects at rest, during exercise, and during a 30-min recovery period. During exercise without sucrose, plasma and dialysate glycerol increased significantly. With sucrose, the response was significantly lower for dialysate glycerol (P < 0.05). Plasma free fatty acid level was lower after sucrose than after water ingestion (P < 0.05). With water ingestion, plasma catecholamines increased significantly, whereas insulin fell (P < 0.05). With sucrose ingestion, the epinephrine response was blunted, whereas the insulin level was significantly increased. In conclusion, the use of adipose tissue microdialysis directly supports a lower lipid mobilization during exercise when sucrose is supplied, which confirms that the availability of carbohydrate influences lipid mobilization.
adipose tissue microdialysis; sucrose; lipid mobilization
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