Lang A H, Partanen V S
J Neurol Sci. 1976 Apr;27(4):513-24. doi: 10.1016/0022-510x(76)90217-3.
Time-locked activity in the EMG was studied in normal, neuropathic and myopathic muscles, using the averaging technique. Normal and neuropathic muscles seemed in most cases not to differ with regard to the frequency nor the quality of "satellite signals", i.e. small and short potentials joining the main component of the MUP with a constant interval, up to 26 ms in duration. In normal muscles 10% of the MUPs and in neuropathic muscles 12% had a satellite, which, when studied, showed no signs of blocking. However, in 2 patients with an apparent old spinal affection both an increased number and an increased latency of satellite signals were found. In the different myopathies studied 45% of the MUPs recorded consecutively were preceded or followed by an often increased number of tiny satellites. Sometimes the satellites joining the myopathic MUP formed a long (up to 60 ms) "tail" after the triggering component. On the basis of our results we conclude that in myopathies the total duration of MUPs is in certain cases pathologically incrased rather than decreased.
采用平均技术，对正常、神经病变和肌病肌肉中的肌电图（EMG）锁时活动进行了研究。在大多数情况下，正常肌肉和神经病变肌肉在“卫星信号”的频率和质量方面似乎没有差异，即小而短的电位以恒定间隔与运动单位电位（MUP）的主要成分相连，持续时间长达26毫秒。在正常肌肉中，10%的MUP有卫星信号，在神经病变肌肉中，12%有卫星信号，研究发现这些卫星信号没有阻滞迹象。然而，在2例明显有陈旧性脊柱病变的患者中，发现卫星信号数量增加且潜伏期延长。在所研究的不同肌病中，连续记录的MUP中有45%之前或之后常有数量增多的微小卫星信号。有时，连接肌病性MUP的卫星信号在触发成分之后形成一条长（长达60毫秒）的“尾巴”。根据我们的结果，我们得出结论，在某些情况下，肌病中MUP的总持续时间病理性增加而非减少。
