Capaday C, Cooke J D
Exp Brain Res. 1983;52(1):139-46. doi: 10.1007/BF00237158.
The effect of muscle tendon vibration during voluntary arm movement was studied in normal humans. Subjects made alternating step flexion and extension movements about the elbow. A small vibrator was mounted over either the biceps or the triceps muscle and vibration was applied during flexion or extension movements. The vibrator was turned off between movements. After a period of practice, subjects learned the required movements and were able to make them with their eyes closed. Application of vibration to the muscle antagonist to the movement being performed produced an undershoot of the required end-movement position. The undershoot was 20-30% of the total movement amplitude. In contrast, vibration of the muscle agonist to the movement resulted in no change in movement end position. The vibration-induced undershoot was associated with an increase in the EMG activity of the vibrated (antagonist) muscle and a resultant increase in the ratio of the antagonist to agonist EMG activity. The increase in antagonist EMG produced by the vibration occurred with a latency of approximately 60 ms from vibration onset. The observed results are consistent with vibration-induced activation of muscle spindle receptors in the lengthening muscle during movement. It is suggested that, during movement, the sensitivity of the spindle receptors in the shortening muscle is decreased and the information concerning limb position during movement comes primarily from the lengthening muscle.
在正常人体中研究了自愿手臂运动期间肌腱振动的影响。受试者进行肘部交替的屈伸运动。在肱二头肌或肱三头肌上方安装一个小型振动器，并在屈伸运动期间施加振动。运动之间关闭振动器。经过一段时间的练习，受试者学会了所需的动作，并能够闭眼完成。对正在进行运动的拮抗肌施加振动会导致所需的最终运动位置出现下冲。下冲幅度为总运动幅度的20% - 30%。相比之下，对运动的主动肌施加振动不会导致运动终点位置发生变化。振动引起的下冲与振动（拮抗）肌的肌电图活动增加以及拮抗肌与主动肌肌电图活动比值的相应增加有关。振动引起的拮抗肌肌电图活动增加在振动开始后约60毫秒出现潜伏期。观察结果与运动期间延长肌中肌梭受体的振动诱导激活一致。有人提出，在运动期间，缩短肌中梭受体的敏感性降低，运动期间肢体位置的信息主要来自延长肌。
