PubMed日本語 - 肘屈筋側の偏心の運動によって誘発された筋損傷に関する2つの最大等尺性収縮の効果。―QLifePro医療翻訳医療翻訳 QLifePro


Effect of two maximal isometric contractions on eccentric exercise-induced muscle damage of the elbow flexors.


Published date



Trevor C Chen, Hsin-Lian Chen, Ming-Ju Lin, Che-Hsiu Chen, Alan J Pearce, Kazunori Nosaka


Department of Physical Education, Health and Recreation, National Chiayi University, 85 Wenlong Village, Minsyong Township, Chiayi County 62103, Taiwan.


This study investigated the time wise protective effect conferred by two maximal voluntary isometric contractions (2MVCs) at 20° elbow flexion on muscle damage induced by 30 maximal isokinetic (60° s(-1)) eccentric contractions of the elbow flexors (MaxECC). Sixty-five young untrained men were randomly assigned to a control group that did not perform 2MVCs, or one of four experimental groups (n = 13 per group) who performed 2MVCs either immediately (0d), 2 (2d), 4 (4d) or 7 days (7d) before MaxECC. Changes in maximal isokinetic (60° s(-1)) concentric torque (MVC-CON), optimum angle (OA), range of motion, upper arm circumference, muscle soreness, plasma creatine kinase activity and myoglobin concentration, and ultrasound echo-intensity following MaxECC were compared among the groups by a two-way repeated measures ANOVA. No significant changes in any variables were evident following 2MVCs. The 2d and 4d groups showed 16-62 % smaller (P < 0.05) changes in all variables following MaxECC than the control, 0d and 7d groups. The 2d group showed 14-34 % smaller (P < 0.05) changes in all variables except for OA compared with the 4d group. The changes in the variables were similar among the control, 0d and 7d groups. These results show that 2MVCs that were performed between 2 and 4 days before MaxECC attenuated the magnitude of muscle damage, but no such effect was evident if the 2MVCs were performed immediately or 7 days before MaxECC. It is concluded that the protective effect conferred by 2MVCs is relatively short-lived, and there is a window for the effect to be conferred.


65人の若い訓練されていない男性は、2MVCsを行わなかった対照群または直ちに2MVCsも行った(0d)4人の実験群(群当たりのn = 13)、2(2d)、4(4d)またはMaxECCの前の7日(7d)のうちの1つまで無作為割付けされた。
2dと4dの群は、MaxECC後に、制御、0dと7dの群より16-62%小さいすべての変数の(P < 0.05)変化を示した。
2dの群は、4dの群と比較してOAを除いてすべての変数の14-34%より小さい(P < 0.05)変化を示した。

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