Hughes M, McLellan D L
J Neurol Neurosurg Psychiatry. 1985 Aug;48(8):782-7. doi: 10.1136/jnnp.48.8.782.
Eleven patients with writer's cramp were studied during the performance of a series of writing and non-writing tasks. Their performance in the tasks and the intensity of contraction in the flexor and extensor muscles of the fingers and elbow (recorded electromyographically) were compared with the results from a group of matched normal controls. The patients showed highly significant increases in muscle activation especially in the triceps muscle which was overactive in all but one of the tasks undertaken. Psychometric testing showed no difference between patients and controls. The results support the view that writer's cramp is a form of focal dystonia in which the disorder of motor control is not confined to writing activities.
对11名患有书写痉挛的患者在进行一系列书写和非书写任务时进行了研究。将他们在这些任务中的表现以及手指和肘部屈肌和伸肌的收缩强度（通过肌电图记录）与一组匹配的正常对照组的结果进行了比较。患者的肌肉激活显著增加，尤其是肱三头肌，在除一项任务外的所有任务中都过度活跃。心理测试表明患者和对照组之间没有差异。这些结果支持了这样一种观点，即书写痉挛是局灶性肌张力障碍的一种形式，其中运动控制障碍并不局限于书写活动。
