Mesin L, Merletti R, Rainoldi A
Laboratory for Engineering of the Neuromuscular System (LISiN), Department of Electronics, Politecnico di Torino, Italy.
J Electromyogr Kinesiol. 2009 Oct;19(5):719-26. doi: 10.1016/j.jelekin.2008.07.006. Epub 2008 Sep 30.
This paper contributes to clarifying the conditions under which electrode position for surface EMG detection is critical and leads to estimates of EMG variables that are different from those obtained in other nearby locations. Whereas a number of previous works outline the need to avoid the innervation zone (or the muscle belly), many authors place electrodes in the central part or bulge of the muscle of interest where the innervation zone is likely to be. Computer simulations are presented to explain the effect of the innervation zone on amplitude, frequency and conduction velocity estimates from the signal and the need to avoid placing electrodes near it. Experimental signals recorded from some superficial muscles of the limbs and trunk (abductor pollicis brevis, flexor pollicis brevis, biceps, upper trapezius, vastus medialis, vastus lateralis) were processed providing support for the findings obtained from simulations. The use of multichannel techniques is recommended to estimate the location of the innervation zone and to properly choose the optimal position of the detection point(s) allowing meaningful estimates of EMG variables during movement analysis.
本文有助于阐明表面肌电图检测中电极位置至关重要的条件，以及由此导致的肌电图变量估计值与在其他附近位置获得的估计值不同的情况。尽管先前的许多研究都概述了避免将电极置于神经支配区（或肌腹）的必要性，但许多作者却将电极放置在感兴趣肌肉的中央部分或隆起处，而此处很可能就是神经支配区。本文通过计算机模拟来解释神经支配区对信号幅度、频率和传导速度估计的影响，以及避免将电极放置在其附近的必要性。对从四肢和躯干的一些浅表肌肉（拇短展肌、拇短屈肌、肱二头肌、上斜方肌、股内侧肌、股外侧肌）记录的实验信号进行了处理，为模拟结果提供了支持。建议使用多通道技术来估计神经支配区的位置，并正确选择检测点的最佳位置，以便在运动分析期间对肌电图变量进行有意义的估计。
