Straube A, Garner C G, Witt T N
Department of Neurology, Ludwig-Maximilian University, München, FRG.
Electromyogr Clin Neurophysiol. 1994 Oct-Nov;34(7):387-90.
The temporal variation of at least two muscle fibers of the same motor unit was recorded with the single fiber EMG technique (SFEMG) by means of special needles and filter settings. In the normal musculus extensor digitorum communis (EDC) the mean variation (jitter) is not longer than 37 microseconds, the fiber density not higher than 1.7 fibers in a 10 ms window. To determine whether these parameters are affected by repeated SFEMG recordings, we measured jitter and fiber density in 20 fiber pairs in the left extensor digitorum communis muscle on day 0, 3, 6, 9 and 30 in 5 healthy volunteers. The mean jitter and the fiber density did not change significantly from day 0 (30.1 +/- 3.6 microseconds; 1.4 +/- 0.07) to day 30 (34.5 +/- 2.7 microseconds; 1.6 +/- 0.13). We conclude that repeated SFEMG recordings do not influence jitter and fiber density.
使用特殊针具和滤波设置，通过单纤维肌电图技术（SFEMG）记录同一运动单位至少两根肌纤维的时间变化。在正常的指总伸肌（EDC）中，平均变化（抖动）不超过37微秒，在10毫秒窗口内纤维密度不高于1.7根纤维。为了确定这些参数是否受重复SFEMG记录的影响，我们在5名健康志愿者的左侧指总伸肌中，于第0天、3天、6天、9天和30天测量了20对纤维的抖动和纤维密度。从第0天（30.1±3.6微秒；1.4±0.07）到第30天（34.5±2.7微秒；1.6±0.13），平均抖动和纤维密度均无显著变化。我们得出结论，重复SFEMG记录不会影响抖动和纤维密度。
