Spatial Analysis of Multichannel Surface EMG in Hemiplegic Stroke.
Spatial Analysis of Multichannel Surface EMG in Hemiplegic Stroke.
复制标题
偏瘫中风中多通道表面EMG的空间分析。
DOI：
10.1109/tnsre.2017.2682298
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发表时间：
2017-10
期刊：
影响因子：
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通讯作者：
Rymer WZ
中科院分区：
文献类型：
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作者：
Rasool G;Afsharipour B;Suresh NL;Rymer WZ
我们研究了上肢肌肉在等长肌力产生过程中的空间激活模式，包括完整的人和半球卒中幸存者。我们使用128通道表面肌电图（EMG）网格记录这些收缩过程中肱二头肌肌肉的电活动。EMG数据进行处理，以开发肌肉活动的二维均方根（RMS）图。我们的目的是确定卒中后运动障碍是否与肌肉活动图和肌肉激活空间分布的变化相关。我们发现，对于一个给定的主题，肌肉活动图的空间模式是一致的，在所有测量的收缩水平不同的RMS EMG。然而，来自中风幸存者的相对臂（中风影响与非影响）的图彼此显著不同，特别是当与观察到的完整参与者的差异相比时。我们的分析表明，慢性中风改变了这些地图中活动区域的大小和位置。前者可能与纤维和组织结构的破坏有关，可能与细胞外脂肪积累、结缔组织浸润、肌纤维萎缩、纤维缩短和纤维损失等因素有关。肌肉活动图中空间模式的变化也可能与神经支配区或肌肉终板区域的位置变化有关。此外，肌电活动图的纹理分析显示，中风影响的肌肉有较大的像素间变异性。肌肉活动图的改变也与功能障碍（使用Fugl-Meyer评分，FM估计）和痉挛程度（使用改良Ashworth量表，MAS估计）有关。总的来说，我们的研究表明，慢性中风的肌肉结构和形态发生了显着改变。
We investigated spatial activation patterns of upper extremity muscles during isometric force generation in both intact persons and in hemispheric stroke survivors. We used a 128-channel surface electromyogram (EMG) grid to record the electrical activity of biceps brachii muscles during these contractions. EMG data were processed to develop 2-dimensional root mean square (RMS) maps of muscle activity. Our objective was to determine whether motor impairments following stroke were associated with changes in the muscle activity maps and in the spatial distribution of muscular activation. We found that, for a given subject, spatial patterns in muscle activity maps were consistent across all measured contraction levels differing only the RMS EMG. However, the maps from opposite arms (stroke-affected vs. non-affected) of stroke survivors were significantly different from each other, especially when compared to the differences observed intact participants. Our analyses revealed that chronic stroke altered the size and the location of the active region in these maps. The former is potentially related to disruption of fiber and tissue structure, possibly linked to factors such as extracellular fat accumulation, connective tissue infiltration, muscle fiber atrophy, fiber shortening and fiber loss. Changes in spatial patterns in muscle activity maps may also be linked to a shift in the location of the innervation zone or the endplate region of muscles. Furthermore, the textural analysis of EMG activity maps showed a larger pixel-to-pixel variability in stroke-affected muscles. Alterations in the muscle activity maps were also related to functional impairment (estimated using Fugl-Meyer score, FM) and to the degree of spasticity (estimated using the modified Ashworth scale, MAS). Overall, our investigation revealed that the muscle architecture and morphology were significantly altered in chronic stroke.