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目的：观察Ｃ纤维兴奋后传导速度是否变化及其变化规律．方法：在麻醉大鼠的尾神经上剥制细束，引导单根Ｃ纤维的传入放电，以单次或不同频率的方形脉冲刺激皮肤感受野或尾神经外周端，测定Ｃ纤维在不同条件刺激兴奋后动作电位传导速度的变化．结果：Ｃ纤维兴奋后的一定时间内传导速度发生变化，大部分平均减慢（７．２６±２．９９）％，小部分平均增快（１．６９±１．２０）％，并且可经一定静息的时间恢复至初始传导速度．随着刺激频率的增加或刺激时间的延长，变速期逐渐延长．结论：Ｃ纤维兴奋后传导速度经历一个变速期，传导速度变化的幅度和变速期的长短与条件刺激的频率和时间相关
Objective: To observe the change of conduction velocity and its variation after C-fiber excited. Methods: The anesthetized rat tail nerve stripped thin beam, and guide the single C fiber into the discharge, with a single or different frequency square pulses to stimulate the skin receptive field or tail nerve peripheral end, measured C fiber in different conditions Changes of action potential conduction velocity after stimulating excitement. Results: The conduction velocity of C fibers changed a certain time after the excitement, most of them slowed down (7.26 ± 2.99)% on average, the average of small part increased (1.69 ± 1.20)% on average, After a certain rest time back to the initial conduction velocity. As the stimulation frequency increases or stimulate the extension of time, the shift period gradually extended. CONCLUSION: The conduction velocity of C fiber undergoes a variable speed period after excited. The amplitude of change of conduction velocity and the length of shift period are related to the frequency and time of conditioned stimulus