STUDIES ON MUSCLE METABOLISM AND CROSS-SECTIONAL AREA IN THE ELITE JAPANESE SOCCER PLAYERS USING NMR

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  • AKIMA HIROSHI
    <I>Master's Program in Health and Physical Education, University of Tsukuba</I>
  • KUNO SHIN-YA
    <I>Department of Sports Sciences, College of Arts and Sciences, University of Tokyo</I>
  • NISHIJIMA TAKAHIKO
    <I>College of Genaral Education, Ibaraki University</I>
  • MARUYAMA TAKEO
    <I>Faculty of Engineering, Tokyo Institute of Technology</I>
  • MATSUMOTO MITSUHIRO
    <I>Institute of Health and Sport Sciences, University of Tsukuba</I>
  • ITAI YUJI
    <I>Department of Radiology, Institute of Clinical Medicine, University of Tsukuba</I>
  • SHIMOJO HITOSHI
    <I>Institute of Health and Sport Sciences, University of Tsukuba</I>
  • KATSUTA SHIGERU
    <I>Institute of Health and Sport Sciences, University of Tsukuba</I>

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Other Title
  • NMRによる国内一流サッカー選手の筋エネルギー代謝および筋横断面積の検討
  • NMR ニ ヨル コクナイ イチリュウ サッカー センシュ ノ キン エネルギ

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Abstract

We investigated the muscle energetics using 31P nuclear magnetic resonance (31P NMR) spectroscopy, muscle cross-sectional area by magnetic resonance imaging (MRI), isokinetic strength, maximal anaerobic power and 40-sec maximal cycling test (40 seconds power) in All Japan soccer players (JPN: n=6), Olympic and Youth representatives (OL: n=6), and Japan Soccer League players (JSL: n=5) . There was no significant difference in muscle energy metabolism measured by 31P NMR between the JPN and the OL or JSL players at rest, during exercise, or in the recovery period. The total muscle cross-sectional area was significantly larger in the JPN players than in the OL players at the upper (70%) and the middle (50%) parts of the thigh (p<0.05) and than in the JSL players in the upper (p<0.01), middle (p< 0.05), and lower (30%) parts (p<0.01) . The isokinetic strength in left leg extension at 180 deg/sec was significantly greater in the JPN players than in the OL players (p<0.05) . Muscle strength was also greater in extension of both legs at 450 deg/sec (left p<0.05, right p<0.01) in the JPN players than in the JSL players. The maximum anaerobic power was significantly greater in the JPN players than in the OL players (p<0.05) and the JSL players (p<0.05), and the anaerobic power per kilogram of body weight was significantly higher in the JPN players than in the JSL players (p<0.01) . There was no significant difference in the 40 seconds power among the three groups. These results suggest that the JPN players have greater muscle power than the OL or JSL players because of the differences in the muscle mass.

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