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Regulation of glycogen resynthesis in muscles of rats following exercise

, : Regulation of glycogen resynthesis in muscles of rats following exercise. American Journal of Physiology 235(3): R145-R150

Following a strenuous bout of exercise, glycogen repletion occurred most rapidly in the fast-twitch red type of muscle, least rapidly in fast-twitch white, and at an intermediate rate in slow-twitch red muscle. There was a linear correlation between glycogen synthase I activity and the rate of glycogen synthesis in the three types of muscle. This finding helps explain the differences between the rates of glycogen resynthesis in the three muscle types, and supports the view that glycogen synthase activity is the most important factor determining the rate of glycogen synthesis when substrate supply is adequate. There was an inverse correlation between muscle glycogen concentration and percent glycogen synthase I. Plasma insulin concentration was low and norepinephrine and glucagon concentrations were elevated in the postexercise period. The finding that rapid glycogen synthesis occurred despite a hormonal milieu conducive to glycogenolysis provides evidence that a low glycogen concentration is a potent stimulus to glycogen synthesis that overrides the effects of low insulin, and high norepinephrine and glucagon levels.

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Accession: 038974750

PMID: 100014

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