Soda Naoki, Ueki Tsutomu
Department of Rehabilitation, Major in Physical Therapy, Heisei College of Health Sciences.
J Phys Ther Sci. 2013 May;25(5):615-7. doi: 10.1589/jpts.25.615. Epub 2013 Jun 29.
[Purpose] The purpose of this study was to investigate and evaluate the timing and amount of muscle activity during forward-stepping motion. [Subjects and Methods] Seven healthy subjects participated in this study. The task was to step forward from a static standing position. Timing and amount of muscle activity were measured during the task. Muscle activities of the stance leg and the swing leg were measured using surface electromyography (EMG). [Results] A high negative correlation was found between the rate of change in the amount of tibialis anterior muscle activity of the stance leg and the reaction time. High positive correlations were found between the rates of change in the gastrocnemius and soleus muscles and the reaction time of the swing leg. [Discussion] Forward-stepping motion can be accomplished using two strategies. One is to swing the leg out taking a step forward using the gastrocnemius and soleus muscles of the swing leg. The other is to take a step forward using the tibialis anterior muscle of the stance leg. Increasing the activity of the tibialis anterior muscle of the stance leg may lead to taking a step forward rapidly.
[目的]本研究旨在调查和评估向前迈步动作过程中肌肉活动的时间和量。[对象与方法]七名健康受试者参与了本研究。任务是从静态站立姿势向前迈步。在任务过程中测量肌肉活动的时间和量。使用表面肌电图（EMG）测量支撑腿和摆动腿的肌肉活动。[结果]发现支撑腿胫骨前肌活动量的变化率与反应时间之间存在高度负相关。发现腓肠肌和比目鱼肌的变化率与摆动腿的反应时间之间存在高度正相关。[讨论]向前迈步动作可以通过两种策略完成。一种是使用摆动腿的腓肠肌和比目鱼肌向前迈出一步摆动腿部。另一种是使用支撑腿的胫骨前肌向前迈出一步。增加支撑腿胫骨前肌的活动可能会导致快速向前迈出一步。
