Abstract
By making use of the method of electric flicker, I measured throughout 24 hours the degree of fatigue and recovery of Japanese railroad men in all kinds of labor (ordinary, a little severe and very severe labor).
The degree of fatigue caused by ordinary labor amounted to about 200 mV when they were leaving office, the maximum value for a little severe labor was about 300 mV at the end of work, and that for very severe labor rose above 400 mV. The value of fatigue measured by Motokawa's method of electric flicker run nearly parallel with the quantity of work done, and corresponded well to the felling of fatigue in many cases.
The author has pleasure in acknowledging his indebtedness to Prof. K. MOTOKAWA who has guided him kindly.
