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Muscle glycogen is an important fuel for contracting skeletal muscle during prolonged

strenuous exercise, and glycogen depletion has been implicated in muscle fatigue. It is also

apparent that glycogen availability can exert important effects on a range of metabolic and

cellular processes. These processes include carbohydrate, fat and protein metabolism during

exercise, post-exercise glycogen resynthesis, excitation--contraction coupling, insulin action

and gene transcription. For example, low muscle glycogen is associated with reduced muscle

glycogenolysis, increased glucose and NEFA uptake and protein degradation, accelerated

glycogen resynthesis, impaired excitation--contraction coupling, enhanced insulin action and

potentiation of the exercise-induced increases in transcription of metabolic genes. Future

studies should identify the mechanisms underlying, and the functional importance of, the

association between glycogen availability and these processes.

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15y ago

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