Wochnik-Dyjas D, Głazowski C, Niewiadomska M
Department of Clinical Neurophysiology, Institute of Psychiatry and Neurology, Warsaw, Poland.
Electroencephalogr Clin Neurophysiol. 1998 Aug;109(4):369-75. doi: 10.1016/s0924-980x(98)00032-0.
To reveal and discuss the peculiarities of soleus muscle in comparison with electrophysiological features of other leg muscles.
Vastus lateralis (L3), tibialis anterior (L4), extensor digitorum brevis (L5) and soleus (S1) muscles were tested at rest. Transcranial magnetic stimulation (TMS) combined which electrical stimulation of relevant peripheral nerves were applied. Cortically evoked motor potentials (C-MEP), peripheral compound muscle action potential (CMAP) and F-wave were recorded. Estimating F-wave conduction time allowed to calculated the central conduction time (CCT-F) within the cortex-spinal motoneurones segment for each muscle.
One could expect that the lower spinal metameric representation of the muscle the longer a corresponding CCT-F. However, a study of 30 healthy subject (60 right and left muscles) reveals a relatively short CCT-F for the soleus muscle. Moreover, the mean amplitude of soleus C-MEP is the lowest, CMAP and F-wave amplitude are the highest and standardised distal motor latency is the longest compared to the analogous parameters for the other muscles.
The reason for these special features can be attributed probably to a different structure and innervation of the soleus (mainly red, slow, tonic muscle) in contrast to the tibialis anterior and extensor digitorum brevis (mainly white, fast, phasic muscle).
揭示并讨论比目鱼肌与腿部其他肌肉电生理特征相比的独特之处。
在静息状态下测试股外侧肌（L3）、胫前肌（L4）、趾短伸肌（L5）和比目鱼肌（S1）。采用经颅磁刺激（TMS）并结合对相关外周神经的电刺激。记录皮质诱发运动电位（C-MEP）、外周复合肌肉动作电位（CMAP）和F波。通过估计F波传导时间来计算每块肌肉在皮质-脊髓运动神经元节段内的中枢传导时间（CCT-F）。
人们可能会认为，肌肉的脊髓节段代表越低，相应的CCT-F就越长。然而，对30名健康受试者（60块左右侧肌肉）的研究发现，比目鱼肌的CCT-F相对较短。此外，与其他肌肉的类似参数相比，比目鱼肌C-MEP的平均波幅最低，CMAP和F波的波幅最高，标准化远端运动潜伏期最长。
这些特殊特征的原因可能归因于比目鱼肌（主要是红色、慢肌、紧张性肌肉）与胫前肌和趾短伸肌（主要是白色、快肌、相位性肌肉）在结构和神经支配上的不同。
