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AJP - Endocrinology and Metabolism, Vol 246, Issue 6 471-E475, Copyright © 1984 by American Physiological Society
ARTICLES |
L. P. Garetto, E. A. Richter, M. N. Goodman and N. B. Ruderman
Thirty minutes after a treadmill run, glucose utilization and glycogen synthesis in perfused rat skeletal muscle are enhanced due to an increase in insulin sensitivity (Richter et al., J. Clin. Invest. 69: 785-793, 1982). The exercise used in these studies was of moderate intensity, and muscle glycogen was substantially repleted at the time (30 min postexercise) that glucose metabolism was examined. When rats were run at twice the previous rate (36 m/min), muscle glycogen was still substantially diminished 30 min after the run. At this time the previously noted increase in insulin sensitivity was still observed in perfused muscle; however, glucose utilization was also increased in the absence of added insulin (1.5 vs. 4.2 mumol X g-1 X h-1). In contrast 2.5 h after the run, muscle glycogen had returned to near preexercise values, and only the insulin-induced increase in glucose utilization was evident. The data suggest that the restoration of muscle glycogen after exercise occurs in two phases. In phase I, muscle glycogen is depleted and insulin-stimulated glucose utilization and glucose utilization in the absence of added insulin may both be enhanced. In phase II glycogen levels have returned to near base-line values and only the increase in insulin sensitivity persists. It is proposed that phase I corresponds to the period of rapid glycogen repletion that immediately follows exercise and phase II to the period of supercompensation.
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