FATIGUE OF MUSCLE AND NERVE 45 



In Mosso's ergograph (fig. 41) the record is made upon a horizontal drum ; 

 in Waller's and Porter's modifications the drum is vertical. 



In the case of voluntary contractions the result is complicated by the fact 

 that fatigue of nerve-cells in the central nervous system occurs before that 

 either of the muscle itself or of the nerve endings in the muscle. This fact can 

 be shown by direct faradic stimulation of the median nerve (or of the finger 

 muscles) after the fatigue curve is complete. It is found that the muscle can 

 still be made to contract by such peripherally applied stimuli. 







