Oxygen consumption during and after exercise and its relation to the degree of fatigue as measured by the method of electric flicker.

pulses of 20 cycles per second as stimulation. The stimulus voltage was increased from zero at a constant rate of 80mV per second to determine the threshold S1 for the appearance of flicker, and then the threshold S2 for the disappearance was determined by lowering the voltage from a sufficiently high level at the same rate as above. The difference of the thresholds S1-S2 at rest was chosen as the standard value and denoted by Ģ S0. The difference S1-S2 obtained in a fatigued state or in the recovery course was denoted by AS. It was shown with many examples that the difference ĢS-ĢS0 can faithfully indicate the degree of fatigue. More over they remarked that the above method of electricc flicker is very sensitive to oxygen insufficiency of the body. This fact suggests that oxygen lack in the body plays some important role at least in some kind of fatigue. Hill, Long and Lupton2) established a connection between fatigue and oxydation in the body or oxygen consumption, and more detailed measurements of gas-metabolism have been made in connection with fatigue by a number of investigators such as Pembrey and Cook,1) Best, Furusawa and Ridout,5 Tomohisa, Sasaki and Matsuyama8-9) and others. In order to investigate the relation between the degree of fatigue (ĢSĢS0) measured by the method of electric flicker and the oxygen consump tion in the body, I have made the following experiments for three kinds of exercise.