Eck U, Vossius G
Institut für Biomedizinische Technik, Universität Karlsruhe, Deutschland.
Biomed Tech (Berl). 2002;47 Suppl 1 Pt 2:517-20. doi: 10.1515/bmte.2002.47.s1b.517.
The measurement of the surface-EMG during electrical stimulation requires the suppression of the stimulus pulse close to the source. This is necessary because of the discharge currents spreading within the human body caused by the stimulation pulse and the drift effects at the electrodes distorting the EMG-signal. A measurement-system will be presented, which splits the EMG in a detection and a processing path. A special converter keeps the base line at zero level. The detection path sets the gain of the recording amplifier and identifies the stimulation pulse to control its suppression. The processing of the EMG is conducted in the main path way. By these means the EMG including M-wave is undistorted and unbiased presented. The results will be discussed taking the physiology relevance into account.
在电刺激过程中测量表面肌电图需要抑制靠近源的刺激脉冲。这是必要的，因为刺激脉冲会导致放电电流在人体内部扩散，并且电极处的漂移效应会使肌电图信号失真。将介绍一种测量系统，该系统将肌电图分为检测路径和处理路径。一种特殊的转换器可将基线保持在零电平。检测路径设置记录放大器的增益，并识别刺激脉冲以控制其抑制。肌电图的处理在主路径中进行。通过这些方法，可以无失真、无偏差地呈现包括M波在内的肌电图。将结合生理相关性对结果进行讨论。
