Watanabe Kohei, Kouzaki Motoki, Moritani Toshio
School of International Liberal Studies, Chukyo University, Nagoya, Japan.
Laboratory of Neurophysiology, Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, Japan.
J Biomech. 2014 Nov 7;47(14):3502-8. doi: 10.1016/j.jbiomech.2014.09.001. Epub 2014 Sep 16.
The spatial distribution pattern of neuromuscular activation within the human rectus femoris (RF) muscle was investigated during gait by multi-channel surface electromyography (surface EMG). Eleven healthy men walked on a treadmill with three gait speeds (4, 5, and 6 km/h) and gradients (0°, 12.5°, and 25°). The spatial distribution of surface EMG was tested by central locus activation (CLA), which is calculated from 2-D multi-channel surface EMG with 46 surface electrodes. For all conditions, CLA was around the middle regions during the swing-to-stance transition and moved in a proximal direction during the stance phase and stance-to-swing transition (p<0.05). CLA during the stance-to-swing transition and early swing phase significantly moved to proximal site with increasing gait speed (p<0.05). During the early stance and swing phases, with increasing grade, CLA significantly moved distally (p<0.05). These results suggest that the RF muscle is regionally activated during a gait cycle and is non-uniformly regulated longitudinally.
通过多通道表面肌电图（表面肌电）研究了人类股直肌（RF）在步态过程中神经肌肉激活的空间分布模式。11名健康男性在跑步机上以三种步态速度（4、5和6公里/小时）和坡度（0°、12.5°和25°）行走。表面肌电的空间分布通过中心位点激活（CLA）进行测试，CLA由带有46个表面电极的二维多通道表面肌电计算得出。在所有条件下，CLA在摆动到站立过渡期间位于中间区域附近，在站立阶段和站立到摆动过渡期间向近端移动（p<0.05）。随着步态速度增加，站立到摆动过渡和早期摆动阶段的CLA显著向近端部位移动（p<0.05）。在早期站立和摆动阶段，随着坡度增加，CLA显著向远端移动（p<0.05）。这些结果表明，RF肌肉在步态周期中局部激活，并且在纵向受到非均匀调节。
