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

日本における一流サッカー選手である日本代表(JPN), 日本オリンピック・ユース代表(OL), 日本サッカーリーグ1部レギュラー選手(JSL)を用いて, 筋エネルギー代謝(PCr/Piおよび細胞内PH), 筋横断面積, 等速性脚筋力, 最大無酸素パワーおよび40秒最大自転車駆動能力(40秒パワー)を測定し, 日本代表と他の群との間にこれらの能力についてどのような相違があるのかについて検討した. 結果の要約は以下の通りである. 1) ^P NMRで測定された安静時および運動時の筋エネルギー代謝能においては, 3群間で差は認められなかった. 2) JPN群は, OL群と比較して大腿上部の筋横断面積(pP nuclear magnetic resonance (^P NMR) spectroscopy, muscle cross-sechonal 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 signinficant difference in muscle energy metabolism measured by ^P NMR between the JPN and the OL or JSL players at rest, during exercise, or in the recovery pehod. The total muscle cross-sechonal 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 signihcantly 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 signincantly higher in the JPN players than in the JSL players (P