Hammond M C, Fitts S S, Kraft G H, Nutter P B, Trotter M J, Robinson L M
Department of Rehabilitation Medicine, University of Washington, Seattle 98195.
Arch Phys Med Rehabil. 1988 May;69(5):348-51.
Co-contraction of antagonist muscles is a recognized clinical phenomenon in patients surviving a cerebrovascular accident. Yet, discrepancies persist in the literature as to whether or not antagonist electromyographic activity is increased in hemiparesis. We have developed a technique to obtain simultaneous counts of motor unit activity in a wrist flexor and extensor muscle using monopolar needle electromyography. Stable stroke patients and age/sex matched control subjects were tested during maximal voluntary isometric wrist flexion and extension. Fewer agonist events (p less than 0.05) and more antagonist events (p less than 0.10) were counted in paretic than in control muscles. A co-contraction ratio of antagonist activity to total (agonist and antagonist) activity was much greater for patients than controls (p less than 0.01). We conclude that both agonist recruitment and antagonist inhibition are impaired in the hemiparetic arm.
拮抗肌的共同收缩是脑血管意外幸存者中一种公认的临床现象。然而，关于偏瘫患者拮抗肌肌电图活动是否增加，文献中仍存在分歧。我们开发了一种技术，使用单极针电极肌电图同时记录腕屈肌和伸肌运动单位活动的计数。在最大自主等长腕屈和伸展过程中，对病情稳定的中风患者以及年龄和性别匹配的对照受试者进行了测试。与对照肌肉相比，患侧肌肉中记录到的主动肌活动事件较少（p<0.05），拮抗肌活动事件较多（p<0.10）。患者的拮抗肌活动与总（主动肌和拮抗肌）活动的共同收缩比率远高于对照组（p<0.01）。我们得出结论，偏瘫侧上肢的主动肌募集和拮抗肌抑制均受损。
