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J Appl Physiol 50: 94-101, 1981;
8750-7587/81 $5.00
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Journal of Applied Physiology, Vol 50, Issue 1 94-101, Copyright © 1981 by American Physiological Society

ARTICLES

Effects of glycerol feeding before and after exhausting exercise in rats

S. E. Terblanche, R. D. Fell, A. C. Juhlin-Dannfelt, B. W. Craig and J. O. Holloszy

Rats were fed either 1 g of glycerol or 1 g of glucose following exercise to exhaustion. Glucose feeding resulted in a rapid increase in blood glucose, with attainment of peak hyperglycemia within 1 h and of peak muscle glycogen in about 2 h. Feeding 1 g of glycerol resulted in marked elevation of glycerol concentration in blood, liver, and muscle; the highest values, measured 1 h after glycerol feeding, ranged from 29 to 42 mumol/g tissue. Blood glucose and muscle glycogen increased slowly in the glycerol-fed rats and peaked much later than after glucose feeding. In perfused rat hindlimb muscles, negligible amounts of [14C]glycerol were incorporated into glycogen. These findings suggest that muscle is not able to utilize glycerol to a significant extent and that glucose derived from glycerol was the major substrate for muscle glycogen synthesis. Animals fed glycerol before a run to exhaustion were able to exercise significantly longer than control rats (153 +/- 11 min vs. 116 +/- 6 min). The glycerol-fed rats depleted their muscle and liver glycogen stores less rapidly than the controls and were protected against development of hypoglycemia during the exercise.


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