Laboratory of Applied Physiology, Graduate School of Human and Environmental Studies, Kyoto University, Yosidanihonmatsucho, Sakyo, Kyoto, Kyoto 6068501, Japan.
J Neurosci Methods. 2011 Jun 15;198(2):332-5. doi: 10.1016/j.jneumeth.2011.03.014. Epub 2011 Apr 2.
Recently, a new recording technique for surface electromyography (EMG) of the deeper muscle component of the quadriceps femoris muscle group, i.e., vastus intermedius (VI) muscle, from the distal portion of the VI muscle has been developed; however, the effect of electrode location on EMG signal of the VI muscle remains unclear. The aim of this study is to compare neuromuscular activation detected at the middle and distal portions of the VI muscle, in order to clarify whether the surface EMG of the VI muscle can be used to assess the neuromuscular activation of the entire muscle. Six healthy men participated in this study. During incremental ramp contraction of isometric knee extension (~30% of maximal voluntary contraction), needle EMG was recorded from the middle and distal regions of the VI muscle and surface EMG was performed at the distal region of the VI muscle. Excellent correlation was observed between needle EMG at the middle and distal regions (r=0.897-0.984, p<0.001). No significant difference was observed between correlation coefficient of surface EMG detected at the distal versus needle EMG detected at the middle and that of surface EMG detected at distal versus needle EMG detected at distal (p<0.05). These results suggest that surface EMG at the distal portion of the VI muscle, which is the only region available for surface EMG, can be used to evaluate global neuromuscular activation of the VI muscle during isometric contraction at a low force level.
最近，一种新的记录技术已经应用于股四头肌肌群深部肌肉成分（即股中间肌）的表面肌电图（EMG），该技术可从股中间肌的远端部分进行记录；然而，电极位置对股中间肌 EMG 信号的影响尚不清楚。本研究的目的是比较股中间肌中、远端的神经肌肉激活情况，以明确股中间肌的表面 EMG 是否可用于评估整个肌肉的神经肌肉激活情况。6 名健康男性参与了本研究。在等长膝关节伸展的递增斜坡收缩（约 30%最大自主收缩）过程中，从股中间肌的中部和远端区域记录针状 EMG，并在股中间肌的远端区域进行表面 EMG 记录。针状 EMG 在中部和远端之间的相关性非常好（r=0.897-0.984，p<0.001）。在表面 EMG 检测的远端与针状 EMG 检测的中部之间的相关系数以及表面 EMG 检测的远端与针状 EMG 检测的远端之间的相关系数之间未观察到显著差异（p<0.05）。这些结果表明，股中间肌远端（即唯一可进行表面 EMG 的区域）的表面 EMG 可用于评估在低力量水平下等长收缩时股中间肌的整体神经肌肉激活情况。
