Mehryar P, Shourijeh M S, Maqbool H F, Torabi M, Dehghani-Sanij A A
Annu Int Conf IEEE Eng Med Biol Soc. 2016 Aug;2016:1676-1679. doi: 10.1109/EMBC.2016.7591037.
In developed countries, the highest number of amputees are elderly with transtibial amputation. Walking on inclined surfaces is difficult for amputees due to loss of muscle volume and strength thereby transtibial amputees (TA) rely on the intact limb to maintain stability. The aim of this study was to use the concatenated non-negative matrix factorization (CNMF) technique to calculate muscle synergy components and compare the difference in muscle synergies and their associated activation profiles in the healthy and amputee groups during ramp ascending (RA) activity. Healthy subjects' dominant leg and amputee's intact leg (IL) were considered for recording surface electromyography (sEMG). The muscle synergies comparison showed a reasonable correlation between the healthy and amputee groups. This suggests the central nervous system (CNS) activates the same group of muscles synergistically. However, the activation coefficient profile (C) results indicated statistically significant difference (p <; 0.05) in some parts of the gait cycle (GC) in healthy and amputee groups. The difference exhibited in activation profiles of amputee's IL could be due to the instability of the prosthetic leg during the GC which resulted in alteration of the IL muscles activations. This information will be useful in rehabilitation and in the future development of prosthetic devices by using the IL muscles information to control the prostheses.
在发达国家，截肢者数量最多的是老年经胫骨截肢者。由于肌肉体积和力量的丧失，截肢者在倾斜表面行走困难，因此经胫骨截肢者（TA）依靠健全肢体来维持稳定性。本研究的目的是使用串联非负矩阵分解（CNMF）技术来计算肌肉协同成分，并比较健康组和截肢组在斜坡上升（RA）活动期间肌肉协同作用及其相关激活模式的差异。记录健康受试者的优势腿和截肢者的健全腿（IL）的表面肌电图（sEMG）。肌肉协同作用比较显示健康组和截肢组之间存在合理的相关性。这表明中枢神经系统（CNS）协同激活同一组肌肉。然而，激活系数模式（C）结果表明，健康组和截肢组在步态周期（GC）的某些部分存在统计学上的显著差异（p<0.05）。截肢者IL激活模式中表现出的差异可能是由于GC期间假肢腿的不稳定性导致IL肌肉激活发生改变。这些信息将有助于康复，并在未来通过利用IL肌肉信息来控制假肢的假肢装置开发中发挥作用。
