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首页> 外文期刊>Journal of electromyography and kinesiology: Official journal of the International Society of Electrophysiological Kinesiology >A new method for the localization of the innervation zone based on monopolar surface-detected potentials
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A new method for the localization of the innervation zone based on monopolar surface-detected potentials

机译：基于单极面检测电位的支配区定位新方法

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In monopolar electrode configuration, the shape of the motor unit potential (MUP) undergoes essential morphologic changes with increasing distance from the innervation zone. In particular, the rising phase of the MUP slows down and becomes longer as the electrode is moved further from the innervation zone. Based on this, it is hypothesized that the maximum slope of the rising phase of a monopolar MUP (Slope(MAX)) would reach its highest value at the innervation zone. Herein, we sought to determine whether the location of the innervation zone coincides with the position in the muscle of the monopolar MUP with highest SlopeMAX and whether new criteria for the localization of the innervation region can be proposed based on the SlopeMAX of monopolar potentials. Multichannel surface (13 x 5 electrode array) and intramuscular (wire electrodes inserted with needles of lengths 15 and 25 mm) EMG signals were concurrently recorded in monopolar configuration from the biceps brachii muscle of 10 healthy subjects. The spatial distribution of monopolar and bipolar MUPs along the fibers' direction were obtained by spike-triggered averaging of the surface EMG. We found that the monopolar MUP with steepest rising phase (i.e., highest SlopeMAX) was located either just above or at half of the inter-electrode distance from the innervation zone. High levels of agreement (94-98%) were found between the position of the innervation zone assessed with the SlopeMAX criteria of monopolar potentials and the position identified using the phase reversal criteria of bipolar potentials. The present results legitimize the use of compound muscle action potentials (M waves) to localize the innervation zone: this location would correspond to the electrode position which yielded the monopolar M wave with highest SlopeMAX. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在单极电极结构中，随着离神经支配区距离的增加，运动单位电位（MUP）的形状发生了本质的形态学变化。特别是，随着电极从神经支配区进一步移动，MUP的上升阶段减慢并变得更长。基于此，假设单极MUP上升阶段的最大斜率（斜率（MAX））将在神经支配区达到其最高值。在此，我们试图确定神经支配区的位置是否与斜率最高的单极MUP在肌肉中的位置一致，以及是否可以基于单极电位的斜率提出神经支配区定位的新标准。10名健康受试者肱二头肌的多道表面（13 x 5电极阵列）和肌肉内（插入长度为15和25 mm的针的线电极）肌电信号以单极配置同时记录。通过对表面肌电进行尖峰触发平均，获得了单极性和双极性MUP沿光纤方向的空间分布。我们发现，上升相位最陡（即斜率最大）的单极MUP位于神经支配区电极间距离的正上方或一半处。在用单极电位的斜率最大标准评估的神经支配区位置和用双极电位的相位反转标准确定的位置之间，发现高度一致（94-98%）。目前的结果证实了使用复合肌肉动作电位（M波）来定位神经支配区的合法性：该位置将对应于产生具有最高斜率的单极M波的电极位置。（C） 2017爱思唯尔有限公司版权所有。

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