Lack of influence of glucagon on glucose homeostasis after prolonged exercise in rats |
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Authors: | H. Galbo E. A. Richter J. J. Holst N. J. Christensen |
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Affiliation: | (1) Institute of Medical Physiology B, University of Copenhagen, DK-2100 Copenhagen;(2) Department of Clinical Chemistry, Bispebjerg Hospital, DK-2400 Copenhagen;(3) Second Clinic of Internal Medicine, Kommunehospitalet, DK-8000 Århus, Denmark |
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Abstract: | Summary The significance of glucagon for post-exercise glucose homeostasis has been studied in rats fasted overnight. Immediately after exhaustive swimming either rabbit-antiglucagon serum or normal rabbit serum was injected by cardiac puncture. Cardiac blood and samples of liver and muscle tissue were collected before exercise and repeatedly during a 120 min recovery period after exercise. During the post-exercise period plasma glucagon concentrations decreased but remained above pre-exercise values in rats treated with normal serum, while rats treated with antiglucagon serum had excess antibody in plasma throughout. Nevertheless, all other parameters measured showed similar changes in the two groups. Thus after exercise the grossly diminished hepatic glycogen concentrations remained constant, while the decreased blood glucose concentrations were partially restored. Simultaneously concentrations in blood and serum of the main gluconeogenic substrates, lactate, pyruvate, alanine and glycerol declined markedly. During the post-exercise period NEFA concentrations in serum and plasma insulin concentrations remained increased and decreased, respectively, while plasma catecholamines did not differ from basal values. Muscle glycogen concentrations decreased slightly. These findings suggest that in the recovery period after exhaustive exercise the increased glucagon concentrations in plasma do not influence gluconeogenesis. |
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Keywords: | Insulin Epinephrine Norepinephrine Glycogen Gluconeogenesis |
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