INFLUENCE OF MUSCLE FIBER COMPOSITION AND MUSCLE CROSS-SECTIONAL AREA ON MAXIMAL ISOMETRIC STRENGTH

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  • RYUSHI TOMOO
    <I>Department of Sports Sciences, College of Arts and Sciences, University of Tokyo</I>
  • FUKUNAGA TETSUO
    <I>Department of Sports Sciences, College of Arts and Sciences, University of Tokyo</I>

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  • 等尺性最大筋力に及ぼす筋断面積および筋線維組成の影響
  • トウ シャクセイ サイダイ キンリョク ニ オヨボス キン ダンメンセキ オヨ

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The purpose of the present study is to investigate the influence of muscle cross-sectional area on maximal isometric strength (M. I. S.), and the influence of muscle fiber composition on the ratio of maximal isometric strength to muscle cross-sectional area in the leg extensor muscles.<BR>Muscle biopsies were taken from the right vastus lateralis of 16 healthy untrained males. Cross-sectional area of the leg extensor muscles were measured by ultrasonic measurements. Maximal isometric strength were determined as peak torques using an isokinetic dynamometer.<BR>Significant positive correlation was observed between muscle cross-sectional area and maximal isometric strength (r=0.61, p<0.05) . The ratio of maximal isometric strength to muscle cross-sectional area was 2.6±0.4 Nm/cm2 (mean±S. D.) with a wide range of values from 2.0 to 3.3 Nm/cm2. No relationship was observed to exist between the ratio of maximal isometric strength to muscle cross-sectional area and muscle fiber composition.<BR>From these results it can be concluded that muscle cross-sectional area plays a more important role in producing a high maximal isometric strength than muscle fiber composition, and that the large variations observed in the ratio of maximal isometric strength to muscle cross-sectional area may be caused by factors other than muscle fiber composition.

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