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）应用于偏瘫患者慢性期。所有患者的行走能力均有所改善。建立肌力图（MMG）检测系统。然而，它是不可能的检测信号通过该系统在步态，因为噪声。噪声发生在麦克风与皮肤之间的连接处。这是我们MMG系统的一个基本问题。取消了步态期间的MMG和EMG分析。代替它们，进行股四头肌等长收缩时的MMG和EMG分析。髋关节90 °固定，踝关节0 °固定。将膝关节设置为60度和90度。通过KIN-COM（查塔努加，TN）测量肌肉收缩力。基于膝伸肌的最大自主收缩，训练安排如下：20、40、50、60、70和80%MVC。MMG数据经傅立叶变换和小波变换后，积分EMG（IEMG）和积分MMG（IMMG）随60 °时%MVC的增加而增加。IEMG在膝关节90 °时表现出相似的结果，IMMG在70%MVC时表现出峰值。这种差异反映了EMG和MMG的特征。膝关节90 °时IEMG和MMG的活动度均高于60 °时。90度时，仅80%MVC的MMG显示降低。在高水平肌肉收缩时，MMG可能由于肌肉室内压过高而不能充分振动，MMG显示了肌肉活动的不同方面。这些信息可用于估计TES对麻痹肌肉的影响。

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.