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J Appl Physiol 72: 143-148, 1992;
8750-7587/92 $5.00
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Journal of Applied Physiology, Vol 72, Issue 1 143-148, Copyright © 1992 by American Physiological Society

ARTICLES

Effect of exercise training and chronic glyburide treatment on glucose homeostasis in diabetic rats

L. J. Goodyear, M. F. Hirshman, E. D. Horton and E. S. Horton
Department of Medicine, University of Vermont College of Medicine, Burlington 05405.

Exercise training and sulfonylurea treatment, either individually or in combination, were evaluated for their effects on plasma glucose concentrations, oral glucose tolerance, and glucose clearance in the perfused hindquarter of diabetic rats. Female rats that were injected with streptozocin (45 mg/kg iv) and had plasma glucose concentrations between 11 and 25 mM were considered diabetic and divided into sedentary, glyburide-treated, exercise-trained, and glyburide-treated plus exercise-trained groups. The sedentary streptozocin-treated rats were severely diabetic, as indicated by elevated glucose concentrations, impaired insulin response during oral glucose tolerance tests, and lower rates of glucose clearance in hindlimb skeletal muscle. Neither 8 wk of exercise training nor 4 wk of glyburide treatment alone improved these parameters. In contrast, the diabetic rats that were both trained and treated with glyburide showed some improvement in glucose homeostasis, as evidenced by lower plasma glucose concentrations, an enhanced insulin response to an oral glucose load, and a decrease in the severity of skeletal muscle insulin resistance compared with the diabetic controls. These data suggest that glyburide treatment or exercise training alone does not alter glucose homeostasis in severely insulin-deficient diabetic rats; however, the combination of exercise training and glyburide treatment may interact to improve glucose homeostasis in these animals.


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