Jaeger R J, Gottlieb G L, Tahmoush A J, Agarwal G C
Exp Neurol. 1984 May;84(2):409-19. doi: 10.1016/0014-4886(84)90237-1.
Application of external torque to cause joint rotation evokes electromyogram (EMG) activity in the stretched muscles. These responses were studied in the tibialis anterior (TA) and flexor carpi ulnaris (FCU) muscles of normal human subjects in conjunction with a nerve block procedure by a local anesthetic agent. In both muscles, differences were observed between the myotatic and postmyotatic portions of the evoked EMG response. During recovery from a complete nerve block, the late components of the EMG (postmyotatic and stabilizing responses) recovered to the preblock magnitude faster than the early components (myotatic and late myotatic responses). Following partial nerve block, the late EMG components were diminished to a lesser extent and recovered faster than the early EMG components. This study suggests that peripheral afferent inputs are obligatory for the myotatic and late myotatic EMG responses. The effects of peripheral afferent inputs on postmyotatic responses are to modulate these later responses. However, the absence of peripheral afferent inputs will not prevent or even delay postmyotatic responses.
施加外部扭矩以引起关节旋转会诱发被拉伸肌肉的肌电图（EMG）活动。在正常人类受试者的胫骨前肌（TA）和尺侧腕屈肌（FCU）中，结合局部麻醉剂进行的神经阻滞程序对这些反应进行了研究。在这两块肌肉中，诱发的EMG反应的肌牵张和牵张后部分之间均观察到差异。在从完全神经阻滞恢复过程中，EMG的晚期成分（牵张后和稳定反应）比早期成分（肌牵张和晚期肌牵张反应）更快恢复到阻滞前的幅度。部分神经阻滞后，EMG晚期成分的减弱程度较小，且比早期EMG成分恢复得更快。这项研究表明，外周传入输入对于肌牵张和晚期肌牵张EMG反应是必不可少的。外周传入输入对牵张后反应的作用是调节这些后期反应。然而，外周传入输入的缺失不会阻止甚至延迟牵张后反应。
