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. 1983 Dec;345:167–173. doi: 10.1113/jphysiol.1983.sp014972

The effect of circulatory occlusion on the glycogen phosphorylase-synthetase system in human skeletal muscle.

D Chasiotis, E Hultman
PMCID: PMC1193791  PMID: 6420545

Abstract

The effect of circulatory occlusion upon the glycogen phosphorylase-synthetase system in intact human muscle at rest has been investigated using the needle biopsy technique. The fraction of phosphorylase in the a form was 26% before occlusion and decreased to 9% after 40 min of occlusion. Synthetase I activity was unchanged during occlusion. After 40 min of occlusion the content of phosphocreatine was decreased by 40%, with a corresponding increase in creatine and inorganic phosphate (Pi). The observed glycogenolytic rate increased during occlusion up to 0.8 mmol glycosyl units kg-1 dry muscle min-1. An intracellular Pi concentration at rest of 2.0 mmol l-1 was calculated from the activities of phosphorylase a and synthetase I assuming that under these conditions they are equal. It is concluded that the glycogenolytic rate during occlusion is a function of both the fraction of phosphorylase in the a form and the availability of Pi at the active site of the enzyme.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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