Methods: The action potential of sciatic trunk and contract curve of sural muscle of hoptoad were recorded, and the time of fatigue in nerve center, neuro-muscular junction and muscle was checked.

• 方法记录蟾蜍坐骨神经干动作电位和腓肠肌收缩曲线,测定低位运动中枢、神经-肌肉接头和骨骼肌出现疲劳的时间并加以比较。