Doherty T J, Brown W F
Faculty of Kinesiology, University Hospital, London, Ontario, Canada.
Muscle Nerve. 1993 Apr;16(4):355-66. doi: 10.1002/mus.880160404.
Multiple point stimulation (MPS) is described as a method of estimating the numbers of motor units in the median innervated thenar muscles of young and older control subjects. Stimulation at multiple sites along the course of the median nerve was employed to collect a sample of the lowest threshold, all-or-nothing surface-recorded motor unit action potentials (S-MUAPs). The average, negative peak area, and peak-to-peak amplitude of the sample of S-MUAPs was determined and divided into the corresponding value for the maximal compound muscle action potential to derive the motor unit estimate (MUE). In 37 trials from 17 younger subjects (20-40 years), the mean MUE was 288 +/- 95 SD based on negative peak area and, in 33 trials from 20 older subjects, mean values were 139 +/- 68. In 23 young and older subjects, MPS was performed on at least two occasions and the MUEs were found to be highly correlated (r = 0.88).
多点刺激（MPS）被描述为一种估计年轻和老年对照受试者正中神经支配的鱼际肌运动单位数量的方法。沿着正中神经走行的多个部位进行刺激，以收集最低阈值的、全或无的表面记录运动单位动作电位（S-MUAPs）样本。确定S-MUAPs样本的平均值、负峰面积和峰峰值幅度，并将其除以最大复合肌肉动作电位的相应值，以得出运动单位估计值（MUE）。在17名年轻受试者（20 - 40岁）的37次试验中，基于负峰面积的平均MUE为288±95标准差，在20名老年受试者的33次试验中，平均值为139±68。在23名年轻和老年受试者中，至少进行了两次MPS，发现MUEs高度相关（r = 0.88）。
