Department of Orthodontics, Albert Ludwigs University, Freiburg, Germany.
Psychophysiology. 2010 Mar 1;47(2):299-314. doi: 10.1111/j.1469-8986.2009.00935.x. Epub 2009 Dec 10.
Locations of surface electromyography (sEMG) electrodes in the face are usually chosen on a macro-anatomical basis. In this study we describe optimal placement of bipolar electrodes based on a novel method and present results for lower facial muscles. We performed high-density sEMG recordings in 13 healthy participants. Raw sEMG signals were decomposed into motor unit action potentials (MUAPs). We positioned virtual electrode pairs in the interpolated monopolar MUAPs at different positions along muscle fiber direction and calculated the bipolar potentials. Electrode sites were determined where maximal bipolar amplitude was achieved and were validated. Objective guidelines for sEMG electrode placement improve the signal-to-noise ratio and may contribute to reduce cross talk, which is particularly important in the face. The method may be regarded as an important basis for improving the validity and reproducibility of sEMG in complex muscle areas.
表面肌电图 (sEMG) 电极在面部的位置通常基于宏观解剖学选择。在这项研究中，我们基于一种新方法描述了双极电极的最佳放置位置，并介绍了下面部肌肉的结果。我们在 13 名健康参与者中进行了高密度 sEMG 记录。原始 sEMG 信号被分解为运动单位动作电位 (MUAP)。我们在插值的单极 MUAP 中在不同的位置放置虚拟电极对，沿着肌纤维方向，并计算双极电位。确定了达到最大双极幅度的电极位置，并进行了验证。sEMG 电极放置的客观指南可以提高信噪比，并有助于减少串扰，这在面部尤其重要。该方法可以被视为提高复杂肌肉区域 sEMG 有效性和可重复性的重要基础。
