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1·Methods: By recording the action potential of sciatic trunk and contract curve of sural muscle of hoptoad, and checking the time of fatigue in nerve center, neuro-muscular junction and muscle.

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-肌接头和骨骼肌出现疲劳的时间并加以比较。

2·Methods: By recording the action potential of sciatic trunk and contract curve of sural muscle of hoptoad, and measuring the time of fatigue in nerve centre, neuro-muscular junction and muscle.

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、神经肌接头、骨骼肌出现疲劳的时间并加以比较。

3·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。