Premoselli S, Galimberti V, Cerri C
Neurorehabilitation Unit, University of Milan, Seregno, Milan, Italy.
Electromyogr Clin Neurophysiol. 1995 Mar;35(2):117-20.
We studied the sensory action potentials (SAP) of median and ulnar nerves in four groups of 20-30, 30-40, 40-50 and 50-60 years old healthy subjects. In each group ten sensitive ulnar and median nerves were examined stimulating respectively V and III hand digital nerves, with two compared methods. In the former stimulus intensity was 20 mA, with a duration 0.1 msec, and SAP was recorded with averaging technique after 20 stimuli; in the latter the stimulus intensity was supra maximal (100 mA), with a duration 0.1 msec and a single SAP was recorded. The SAP's recording was performed by bipolar surface electrodes at the wrist, following conventional techniques. There was not statistically significant difference between SAP's latencies obtained with the two methods in each group, even if there was a decrease of the latency value obtained with supra maximal stimulus. Otherwise there was a statistically significant increase of SAP's amplitude obtained with supra maximal stimulus, above all in elderly people for median (p < 0.001) and ulnar (p < 0.0005) nerve.
我们研究了四组年龄在20 - 30岁、30 - 40岁、40 - 50岁和50 - 60岁的健康受试者正中神经和尺神经的感觉动作电位（SAP）。每组中，分别刺激手部的V指神经和III指神经来检测10条敏感的尺神经和正中神经，采用两种比较方法。在前者中，刺激强度为20 mA，持续时间为0.1毫秒，20次刺激后用平均技术记录SAP；在后者中，刺激强度为超强刺激（100 mA），持续时间为0.1毫秒，记录单个SAP。SAP的记录是通过手腕处的双极表面电极按照传统技术进行的。即使超强刺激获得的潜伏期值有所下降，但每组中两种方法获得的SAP潜伏期之间没有统计学上的显著差异。否则，超强刺激获得的SAP波幅有统计学上的显著增加，尤其是在老年人的正中神经（p < 0.001）和尺神经（p < 0.0005）方面。
