Impairment of voluntary control of finger motion following stroke: Role of inappropriate muscle coactivation
Impairment of voluntary control of finger motion following stroke: Role of inappropriate muscle coactivation
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DOI：
10.1002/mus.1054
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发表时间：
2001-05-01
期刊：
影响因子：
3.4
通讯作者：
Rymer, WZ
中科院分区：
文献类型：
--
作者：
Kamper, DG;Rymer, WZ
中风后慢性偏瘫患者试图进行掌指关节伸肌自主等距、等速和自由收缩。我们记录了关节的扭矩、掌指关节的角度和速度，以及外源性伸屈肌和第一背骨间肌（FDI）的肌电图（EMG）活动。我们发现，与对照组相比，偏瘫患者的自主MCP关节伸展受到了很大的损害。11名中风受试者中只有2名能够产生0.21 N-m的等距伸展扭矩，只有2名能够在无负荷的情况下产生手指正向伸展，没有人能够产生等距同心伸展。缺陷似乎是由手指屈肌和伸肌的共同激活以及伸肌自主兴奋的减少共同引起的，因为中风患者的正常屈肌和FDI肌电图活动比对照组更大（P < 0.001），但正常伸肌活动减少（P < 0.001）， (C) 2001 John Wiley & Sons, Inc.。
Subjects with chronic hemiplegia following stroke attempted to perform voluntary isometric, isokinetic, and free contractions of the extensor muscles of the metacarpophalangeal (MCP) joints. We recorded torque, metacarpophalangeal joint angle and velocity, and electromyographic (EMG) activity of the extrinsic extensors and flexors and the first dorsal interosseous (FDI), We found that voluntary MCP joint extension in hemiparetic subjects was greatly impaired in comparison with control subjects: only two of the 11 stroke subjects were able to generate even 0.21 N-m of isometric extension torque, only two could produce positive finger extension with no load, and none could develop an isokinetic concentric extension. Deficits seemed to result from a combination of coactivation of the finger flexor and extensor muscles and decreased voluntary excitation of the extensors, as normalized flexor and FDI EMG activity were greater for stroke than for control subjects (P < 0,001), but normalized extensor activity was reduced (P < 0,001), (C) 2001 John Wiley & Sons, Inc.