Cleveland Clinic Foundation, Cleveland, OH 44195, USA.
Neurorehabil Neural Repair. 2011 May;25(4):359-68. doi: 10.1177/1545968310388665. Epub 2011 Feb 22.
After hemiparetic stroke, coordination of the shoulder flexor and elbow extensor muscles during a reaching movement is impaired and contributes to poor performance.
The aim was to determine whether functional coupling between electromyographic signals of synergist muscles during reaching was weakened in stroke patients who had poor motor coordination.
Surface electromyography (EMG) from the anterior deltoid, triceps brachii, biceps brachii, pectoralis major, supraspinatus, and latissimus dorsi of the affected upper limb in 11 stroke patients (mean Fugl-Meyer upper extremity score 27 ± 8) and in the dominant arm of 8 healthy controls were measured.
Coherence between the EMG of the anterior deltoid and triceps brachii, 2 synergists for reaching, was lower in patients compared with controls, in the 0- to 11-Hz range. Detailed segmented frequency-range analysis indicated significant differences in the coherence between groups in 0- to 3.9-Hz and 4- to 7.9-Hz ranges.
This weakened functional coupling may contribute to poor reaching performance and could be a consequence of a loss of common drive at the frequency bands as a result of interruption of information flow in the corticospinal pathway.
偏瘫后，肩部屈肌和肘部伸肌在进行伸展运动时的协调性受损，导致运动表现不佳。
旨在确定运动协调能力较差的脑卒中患者在伸展过程中协同肌肌电信号之间的功能耦合是否减弱。
对 11 名脑卒中患者（平均 Fugl-Meyer 上肢评分 27±8）和 8 名健康对照者的患侧上肢三角肌前部、肱三头肌、肱二头肌、胸大肌、冈上肌和背阔肌的表面肌电图（EMG）进行了测量。
与对照组相比，2 名用于伸展的协同肌（三角肌前部和肱三头肌）的 EMG 在 0-11Hz 范围内的相干性在患者中较低。详细的分段频率范围分析表明，两组在 0-3.9Hz 和 4-7.9Hz 范围内的相干性存在显著差异。
这种功能耦合的减弱可能导致伸展运动表现不佳，这可能是由于皮质脊髓通路信息传递中断导致共同驱动力在频带中丧失的结果。
