Journal of Applied Physiology AJP: Renal Physiology
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J Appl Physiol 88: 1277-1283, 2000;
8750-7587/00 $5.00
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Vol. 88, Issue 4, 1277-1283, April 2000

Adipose tissue lipolysis is increased during a repeated bout of aerobic exercise

V. Stich1, I. de Glisezinski2, M. Berlan3, J. Bulow4, J. Galitzky3, I. Harant2, H. Suljkovicova1, M. Lafontan3, D. Rivière2, and F. Crampes2

1 Department of Sport Medicine, Charles University, 100 00 Prague 10, Czech Republic; 2 Laboratoire des Adaptations de l'Organisme à l'Exercice Musculaire, Centre Hospitalier Universitaire Purpan, 31059 Toulouse; 3 Institut National de la Santé et de la Recherche Médicale, Unité 317, Laboratoire de Pharmacologie Médicale et Clinique, Faculté de Médecine, 31043 Toulouse, France; and 4 Department of Clinical Physiology and Nuclear Medicine, Bispebjerg Hospital, 2400 Copenhagen, Denmark

The goal of the study was to examine whether lipid mobilization from adipose tissue undergoes changes during repeated bouts of prolonged aerobic exercise. Microdialysis of the subcutaneous adipose tissue was used for the assessment of lipolysis; glycerol concentration was measured in the dialysate leaving the adipose tissue. Seven male subjects performed two repeated bouts of 60-min exercise at 50% of their maximal aerobic power, separated by a 60-min recovery period. The exercise-induced increases in extracellular glycerol concentrations in adipose tissue and in plasma glycerol concentrations were significantly higher during the second exercise bout compared with the first (P < 0.05). The responses of plasma nonesterified fatty acids and plasma epinephrine were higher during the second exercise bout, whereas the response of norepinephrine was unchanged and that of growth hormone lower. Plasma insulin levels were lower during the second exercise bout. The results suggest that adipose tissue lipolysis during aerobic exercise of moderate intensity is enhanced when an exercise bout is preceded by exercise of the same intensity and duration performed 1 h before. This response pattern is associated with an increase in the exercise-induced rise of epinephrine and with lower plasma insulin values during the repeated exercise bout.

microdialysis; norepinephrine; epinephrine; growth hormone


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