Abe Daijiro, Muraki Satoshi, Yanagawa Kazumasa, Fukuoka Yoshiyuki, Niihata Shigemitsu
Faculty of Human Sciences, University of East Asia, Shimonoseki, Yamaguchi 751-8503, Japan.
Gait Posture. 2007 Oct;26(4):607-10. doi: 10.1016/j.gaitpost.2006.12.014. Epub 2007 Feb 2.
This study quantified the interaction of integrated electromyography (iEMG) obtained from the vastus lateralis and the metabolic energy cost of running (Cr), an index to assess running economy, during 90-min prolonged running. The iEMG during running was divided into eccentric (ECC) and concentric (CON) phases using a force platform and a knee-joint goniometer. The ratio of ECC to CON (ECC/CON ratio) significantly decreased during 90-min prolonged running in novice distance runners, which would be explained by an increase in muscle activity during the CON phase of running. The average Cr value significantly increased during 90-min prolonged running. The individual's Cr values significantly correlated with the ECC/CON ratio (r=-0.702, P<0.05). These results suggest that changes in the ECC/CON ratio and Cr value during prolonged running are associated.
本研究对在90分钟持续跑步过程中，从股外侧肌获取的积分肌电图（iEMG）与跑步的代谢能量消耗（Cr，一种评估跑步经济性的指标）之间的相互作用进行了量化。使用测力平台和膝关节角度计将跑步过程中的iEMG分为离心（ECC）和向心（CON）阶段。在新手长跑运动员90分钟的持续跑步过程中，ECC与CON的比值（ECC/CON比值）显著下降，这可以通过跑步CON阶段肌肉活动的增加来解释。在90分钟的持续跑步过程中，平均Cr值显著增加。个体的Cr值与ECC/CON比值显著相关（r=-0.702，P<0.05）。这些结果表明，长时间跑步过程中ECC/CON比值和Cr值的变化是相关的。
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