Journal of Applied Physiology
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J Appl Physiol 57: 1404-1408, 1984;
8750-7587/84 $5.00
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Journal of Applied Physiology, Vol 57, Issue 5 1404-1408, Copyright © 1984 by American Physiological Society

ARTICLES

Muscle glycogen repletion after exercise in trained normal and diabetic rats

M. H. Tan, A. Bonen, W. Watson-Wright, D. Hood, M. Sopper, D. Currie, A. N. Belcastro and G. Pierce

We hypothesize that training results in a faster and greater repletion of glycogen in skeletal muscles of normal and diabetic rats. Normal male Sprague-Dawley rats (100-140 g) were divided into two groups--one to train by treadmill running for 10 wk and the other to remain sedentary. Forty-eight hours after the last training session the rats of both groups were exercised to exhaustion. One subgroup of each was fed oral glucose (3 g/kg) at exhaustion and killed 60 min later. The other was killed at exhaustion. The glycogen concentration of soleus, plantaris, and red and white gastrocnemius was determined in all rats. The trained group had higher glycogen levels after glucose feeding in all muscles (P less than 0.002) and repleted their muscle glycogen more rapidly (P less than 0.05). However, in diabetic rats (45 mg streptozotocin/kg body wt) the trained and sedentary rats have similar glycogen levels and glycogen repletion rates in all muscles. Compared with the normal trained rats, the diabetic trained rats had slower glycogen repletion rates (P less than 0.05).


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