Study about improvement of walking ability of hemiplegia after therapeutic electrical stimulation by means of MMG, EMG and motion analysis

治疗性电刺激（TES）应用于慢性偏瘫患者。所有患者的行走能力均有改善。建立了肌力图（MMG）检测系统。然而，由于噪声的存在，该系统无法检测到步态中的信号。噪声发生在麦克风和皮肤之间的连接处。这是我们MMG系统的一个基本问题。取消步态时的肌电图和肌电图分析。代替它们，在股四头肌等距收缩时进行MMG和EMG分析。将髋关节固定在90度，踝关节固定在0度。膝关节设置为60度和90度。肌肉收缩力采用KIN-COM （Chattanooga， TN）测量。根据膝关节伸肌的最大自主收缩，课程安排如下：20,40,50,60,70和80% MVC。对MMG数据进行傅里叶变换和小波变换处理。膝关节60度处综合肌电（IEMG）和综合MMG （IMMG）随MVC %的增加而增加。IEMG在膝关节90度处显示相似的结果，IMMG在70% MVC处显示峰值。这种差异反映了肌电图和肌电图的特征。IEMG和MMG均显示膝关节90度处活动度高于60度处。只有80% MVC在90度时MMG下降。在肌肉高度收缩时，MMG可能不会产生足够的振动，因为肌肉室的内部压力可能太高而无法振动。MMG表现出不同方面的肌肉活动。这些信息可用于估计TES对麻痹性肌肉的影响。

Therapeutic electrical stimulation (TES) was applied to hemiplegic patients in chronic stage. All of them showed improvement of walking ability. Mechanomyogram (MMG) detecting system was established. However, it was impossible to detect signals by means of this system during gait because of noise. The noise was occurred at the attachment between a microphone and skin. This was a fundamental problem of our MMG system. MMG and EMG analysis during gait were canceled. Instead of them, MMG and EMG analysis during isometric contraction of the quadriceps femoris were done. The hip joint was fixed at 90 degrees and ankle joint at 0 degree. The knee joint was set to 60 and 90 degrees. Muscle contractile force was measured by KIN-COM (Chattanooga, TN). Based on the maximal voluntary contraction of knee extensor, the session was arranged as follows ; 20, 40, 50, 60, 70 and 80 %MVC. MMG data were processed by Fourier and Wavelet transform.Integrated EMG (IEMG) and integrated MMG (IMMG) increased according to increase of %MVC at 60 degrees of knee joint. While IEMG showed similar result at 90 degrees of knee joint, IMMG showed peak at 70 %MVC. This difference indicates characteristic of EMG and MMG. Both of IEMG and MMG showed higher activity at 90 degrees than at 60 degrees of knee joint. Only MMG of 80 %MVC at 90 degrees showed decrease. MMG might not vibrate enough at high level of muscle contraction because inner pressure of muscle compartment might be too high to vibrate.MMG showed different aspect of muscle activity. The information can be useful for estimate TES effect to paretic muscles.