Reduced glycolytic metabolism in regenerated fast-twitch skeletal muscle

M. A. Wineinger, Fredric A Gorin, R. Tait, B. Froman, R. C. Carlsen

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Abstract

Freely grafted rat extensor digitorum longus (EDL) muscles were subjected to low-frequency stimulation in an anaerobic environment to determine whether regenerating fast-twitch muscles regain normal glycolytic metabolic capacity. Regenerating muscles were tested at 28, 42, and 76 days after the graft procedure. Stabilized grafts (76 days) produced ~60% of the lactate generated by intact, control EDL subjected to the same stimulus paradigm and developed half the estimated increase in H+. The grafts exhibited the same relative decline in force after 5 min of anaerobic stimulation as control EDL but maintained relatively constant levels of ATP while consuming phosphocreatine. This study indicates that regenerating fast-twitch skeletal muscle has a reduced ability to initiate glycolytic activity during exercise. The data also indicate that a small population of regenerating fast-twitch fibers express the slow isoform of myosin heavy chain (β-MHC) with maximum expression occurring at 56 days postsurgery.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Cell Physiology
Volume261
Issue number1 30-1
StatePublished - 1991

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Keywords

  • Extensor digitorum longus muscle
  • Free muscle grafts
  • Phosphocreatine

ASJC Scopus subject areas

  • Clinical Biochemistry
  • Cell Biology
  • Physiology

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