Chan R C, Hsu T C
Department of Physical Medicine and Rehabilitation, National Defense Medical Center, Triservice General Hospital, Taipei, Taiwan, ROC.
Muscle Nerve. 1991 Oct;14(10):1028-32. doi: 10.1002/mus.880141015.
This study quantitatively compared the simultaneous recording of the "same" motor unit potentials recorded by closely positioned concentric and monopolar needles. The motor unit potentials from the anterior tibialis of 12 young subjects were analyzed independently by both needles being connected to 2 sets of EMG-computer combinations. Recordings of the same motor unit potentials were confirmed by triggering and averaging of the 2 sets of motor unit potentials with identical firing patterns on both EMG screens. Automatic analysis disclosed the monopolar recordings had a significantly higher mean amplitude (2.05 times), larger surface area (2.64 times), and longer duration (1.86 times) than the concentric recordings, while the mean number of phases (1.58 times) and turns (1.35 times) revealed no statistical differences. Both active recording and reference electrodes contributed to these differences.
本研究定量比较了通过紧密放置的同心针和单极针同时记录的“相同”运动单位电位。12名年轻受试者胫前肌的运动单位电位，通过将两根针分别连接到两组肌电图-计算机组合进行独立分析。通过在两个肌电图屏幕上触发和平均具有相同放电模式的两组运动单位电位，确认记录的是相同的运动单位电位。自动分析显示，单极记录的平均波幅显著更高（2.05倍）、表面积更大（2.64倍）、持续时间更长（1.86倍），而平均相数（1.58倍）和转折数（1.35倍）无统计学差异。主动记录电极和参考电极都导致了这些差异。
