Ertekin C, Ertaş M, Efendi H, Larsson L E, Sirin H, Araç N, Toygar A, Demir Y
Department of Neurology, Medical School Hospital, Ege University, Bornova, Izmir, Turkey.
Electroencephalogr Clin Neurophysiol. 1995 Oct;97(5):275-83. doi: 10.1016/0013-4694(95)00038-z.
Transcranial electrical or magnetic stimulation was performed in 47 experiments on 42 normal adult subjects. Surface compound muscle action potentials were recorded from the antagonistic tibialis anterior (TA) and soleus (SOL) muscles. A stable late response recorded from SOL during voluntary ankle dorsiflexion is described and called soleus MEP-80. Its origin has been studied with different experimental procedures. (1) It is only obtained during active voluntary dorsiflexion of the ankle within 70-100 msec (mean 86.9 +/- 6.4 msec) whereas passive dorsiflexion does not promote such a response. The size of SOL MEP-80 was always bigger than the primary SOL response. (2) A similar constant response has not been obtained during voluntary plantar flexion from SOL and TA muscles. (3) SOL MEP-80 is not changed significantly by the Jendrassik manoeuvre. (4) It is not obtained or is suppressed when the subject is sitting with the feet free in space. On the other hand, it is obtained when the subject is standing, especially when standing is made difficult. (5) SOL MEP-80 has not been obtained by brain-stem, spinal cord or root stimulation. (6) A later response of longer than 100 msec latency was sometimes obtained at rest but such an S100 soleus response was abolished or transformed to the SOL MEP-80 immediately during ankle dorsiflexion. (7) It is concluded that SOL MEP-80 is a polysynaptic extensor response related to postural mechanisms and originating through convergence of descending motor commands and peripheral sensory feedback.
对42名正常成年受试者进行了47次经颅电刺激或磁刺激实验。从拮抗的胫骨前肌（TA）和比目鱼肌（SOL）记录表面复合肌肉动作电位。描述了在自愿踝关节背屈期间从SOL记录到的稳定的晚期反应，并将其称为比目鱼肌运动诱发电位-80（SOL MEP-80）。已通过不同的实验程序研究了其起源。（1）仅在踝关节主动自愿背屈70 - 100毫秒（平均86.9±6.4毫秒）内获得，而被动背屈不会引发这种反应。SOL MEP-80的大小总是大于比目鱼肌的初级反应。（2）在比目鱼肌和胫骨前肌的自愿跖屈过程中未获得类似的恒定反应。（3）Jendrassik动作对比目鱼肌运动诱发电位-80没有显著影响。（4）当受试者双脚自由悬空坐着时，未获得该反应或该反应被抑制。另一方面，当受试者站立时，尤其是在站立困难时可获得该反应。（5）通过脑干、脊髓或神经根刺激未获得比目鱼肌运动诱发电位-80。（6）有时在休息时可获得潜伏期超过100毫秒的较晚反应，但在踝关节背屈期间，这种比目鱼肌S100反应立即消失或转变为比目鱼肌运动诱发电位-80。（7）得出结论，比目鱼肌运动诱发电位-80是一种多突触伸肌反应，与姿势机制相关，通过下行运动指令和外周感觉反馈的汇聚产生。
