Tanabe S, Muraoka Y, Tomita Y
Graduate School of Science & Technology, Keio University, Shizuoka Japan.
Med Biol Eng Comput. 2004 Jan;42(1):106-9. doi: 10.1007/BF02351018.
A new method of stimulation of the lower extremities was devised that automatically adjusts the stimulation conditions at any angle of the knee joint. An M-wave is considered to indicate the stimulation conditions, because it is the waveform that results from direct stimulation to the axon of the alpha motor neuron. The present device adjusted the stimulation intensity, using multi-regression analysis to evoke an M-wave of preset amplitude. Participants included five people without any neuromuscular impairment. The subjects sat on a chair during the test. The hip joint was fixed at a flexion angle of 90 degrees, and the ankle joint was fixed at the midposition. During passive knee joint movement ranging from 0 degrees to 135 degrees, M-waves were measured. Electrodes were attached at the popliteal fossa and the patella to stimulate the tibial nerve. Ag-AgCl electrodes were put on the belly of the right soleus muscle for the M-wave measurement. The device was set to give M-waves close to the preset value, 10% Mmax. According to previous research, the allowable limit of M-wave amplitude deviations was reported to be about 5% Mmax. The M-wave amplitudes evoked by the device were in the allowable range (9.2 +/- 2.5% Mmax). The device enabled control of the M-wave amplitude over the entire range of motion of the joint. Using this device, it was possible to examine the excitability of the alpha motor neuron pool more precisely.
设计了一种刺激下肢的新方法，该方法可在膝关节的任何角度自动调整刺激条件。M波被认为可指示刺激条件，因为它是由直接刺激α运动神经元的轴突产生的波形。本装置使用多元回归分析来调整刺激强度，以诱发预设幅度的M波。参与者包括五名没有任何神经肌肉损伤的人。测试期间，受试者坐在椅子上。髋关节固定在90度的屈曲角度，踝关节固定在中间位置。在膝关节从0度到135度的被动运动过程中，测量M波。电极附着在腘窝和髌骨处以刺激胫神经。将Ag-AgCl电极放在右比目鱼肌的肌腹上以测量M波。该装置设置为产生接近预设值（10%Mmax）的M波。根据先前的研究，M波幅度偏差的允许极限据报道约为5%Mmax。该装置诱发的M波幅度在允许范围内（9.2±2.5%Mmax）。该装置能够在关节的整个运动范围内控制M波幅度。使用该装置，可以更精确地检查α运动神经元池的兴奋性。
