Glycogen resynthesis in leg muscles of rats during exercise.

S. H. Constable, J. C. Young, Mitsuru Higuchi, J. O. Holloszy

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Abstract

This study was undertaken to determine whether glycogen resynthesis can occur in glycogen-depleted muscles in response to glucose feeding during prolonged exercise. Rats were exercised for 40 min with a treadmill running program designed to deplete muscle glycogen. One group was studied immediately after the glycogen-depletion exercise. A second group was given 1 g glucose by stomach tube and exercised for an additional 90 min at a running speed of 22 m/min on a treadmill set at an 8 degree incline; they were given additional 1-g glucose feedings after 30 and 60 min of running. The initial 40-min run resulted in liver glycogen depletion, large decreases in plasma glucose and insulin concentrations, and a marked lowering of muscle glycogen. The glucose feedings resulted in greater than twofold increases in the concentrations of glucose and insulin in plasma, and of glycogen in leg muscles, during the 90 min of running. No repletion of liver glycogen occurred. These results provide evidence that glycogen resynthesis can occur in glycogen-depleted muscle despite continued moderate intensity exercise if sufficient glucose is made available.

Original languageEnglish
JournalThe American journal of physiology
Volume247
Issue number5 Pt 2
Publication statusPublished - 1984 Nov
Externally publishedYes

ASJC Scopus subject areas

  • Medicine(all)

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  • Cite this

    Constable, S. H., Young, J. C., Higuchi, M., & Holloszy, J. O. (1984). Glycogen resynthesis in leg muscles of rats during exercise. The American journal of physiology, 247(5 Pt 2).