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目的 :研究脑卒中患者最大等长收缩(maximum isometric voluntary contraction,MIVC)运动中肱二头肌和肱桡肌表面肌电特征,为脑卒中上肢康复治疗提供电生理学依据。方法:选取脑卒中后偏瘫患者15例,通过表面肌电采集患侧和健侧MIVC运动中肱二头肌和肱桡肌的表面肌电均方根值(root mean square,RMS),并对患侧和健侧肱二头肌和肱桡肌间的RMS值(平均值和最大值)分别进行对比分析。结果:患侧肱二头肌和肱桡肌MIVC运动中测得的RMS平均值和最大值均明显低于健侧,差异有统计学意义(P<0.001)。患侧和健侧MIVC运动中肱二头肌的RMS值平均值和最大值均明显高于肱桡肌,差异有统计学意义(P<0.001)。结论:脑卒中可导致其患侧MIVC时运动单位募集能力下降。肱二头肌在屈肘肌MIVC运动中发挥主导作用。
Objective: To study the electromyographic features of the biceps and brachioradialis muscle in the maximum isometric voluntary contraction (MIVC) stroke in stroke patients and provide the electrophysiological basis for the rehabilitation of upper limbs in stroke patients. Methods: Fifteen patients with post-stroke hemiplegia were selected. The surface myoelectric mean root mean square (RMS) of the biceps and brachioradialis in MIVC was measured by surface electromyography. The ipsilateral and contralateral biceps and brachioradialis RMS values (mean and maximum) were compared. Results: The mean and maximum values of RMS measured in MIVC movement of ipsilateral brachioradialis and brachioradialis were significantly lower than those of contralateral side, the difference was statistically significant (P <0.001). The mean and maximum RMS values of biceps brachii in ipsilateral and contralateral MIVC were significantly higher than those in brachioradialis, the difference was statistically significant (P <0.001). CONCLUSIONS: Stroke can lead to a decrease in motor recruitment during MIVC on the affected side. Biceps in the elbow muscle MIVC exercise play a leading role.