Hallett M, Shahani B T, Young R R
J Neurol Neurosurg Psychiatry. 1975 Dec;38(12):1154-62. doi: 10.1136/jnnp.38.12.1154.
EMG activity was recorded in biceps and triceps while subjects voluntarily flexed their elbows during a visual matching task. With fast flexion, the initial EMG was characterized by a triphasic pattern with a burst of activity first in biceps, then in triceps with a silent period in biceps, and finally in biceps again; these components were analysed quantitatively. Smooth flexion was characterized by continuous activity in biceps. Inhibition of tonic activity of triceps in relation to a fast flexion occurred in the 50 ms before the initiation of biceps activity. A patients with a severe pansensory neuropathy performed normally on these tasks. Physiological mechanisms underlying these patterns are analysed; an important conclusion is that the triphasic activity with fast flexion is 'centrally programmed'.
在视觉匹配任务中，当受试者主动屈曲肘部时，记录肱二头肌和肱三头肌的肌电图（EMG）活动。快速屈曲时，初始肌电图的特征是三相模式，先是肱二头肌出现一阵活动，然后肱三头肌活动，肱二头肌出现静息期，最后肱二头肌再次活动；对这些成分进行了定量分析。缓慢屈曲的特征是肱二头肌持续活动。在肱二头肌活动开始前50毫秒，肱三头肌的紧张性活动相对于快速屈曲受到抑制。一名患有严重全感觉神经病变的患者在这些任务中表现正常。分析了这些模式背后的生理机制；一个重要结论是，快速屈曲时的三相活动是“中枢编程的”。
