THE FUNCTIONAL PROPERTIES OF VERY SMALLER MYOFIGERS IN REGENERATED SKELETAL MUSCLE AFTER EXERCISE-INDUCED MUSCLE INJURY

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  • ISHIDO MINENORI
    Graduate school of Sport and Exercise Science, Osaka University of Health and Sport Sciences
  • HIRANO TOMOE
    Gifu Shotoku Gakuen University Junior College
  • KASUGA NORIKATSU
    Department of Health Sciences, Aichi University of Education

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Other Title
  • 運動性筋損傷から回復後に見られる極細筋線維の機能特性
  • ウンドウセイキン ソンショウ カラ カイフク ゴ ニ ミラレル ゴクボソキン センイ ノ キノウ トクセイ

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Markedly smaller myofibers including branched myofibers (SF) were contained in regenerated skeletal muscles. However, its functional properties are not yet sufficiently understood. The present study examined the metabolic, contractile properties and hypertrophy of SF included in rat skeletal plantaris muscles regenerated from eccentric contraction-induced muscle injury. Succinate dehydrogenase and alpha-glycerophosphate dehydrogenase activity of SF were respectively similar to that of other normal size myofibers (NF) within regenerated muscles. The shortening velocity of skinned fibers prepared from branched myofibers isolated from regenerated muscles was slightly slower than that of control muscles. In addition, the extent of glycogen depletion in SF was similar to that of NF after exhaustive running. Therefore, SF were innervated by motoneurons and recruited during the contractile activity of the skeletal muscle. No matter when the regenerated muscle was loaded by synergistic ablation, the continued existence of SF was observed. Therefore, the ability of hypertrophy in SF may be distinct from that in NF. The physiological properties of SF were similar to that of normal myofiber, except for the ability to regulate hypertrophy.

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