Abstract
To study the excretion of lactic acid after exercise, urine was collected in ten minute periods and was analyzed for lactic acid by Clausen's method. After one or two minutes of strenuous exercise the lactic acid excretion rose from a normal of about 2 mg. in ten minutes to about 150 mg. in ten minutes. The excretion reached a maximum within twenty minutes after exercise and then fell rapidly. There was a return to normal in about one hour. The experiments were carried out using men as subjects.
Highlights
The severity of the sustained effort seems to be such that a “steady state” is reached where lactic acid is disposed of as fast as it is formed. This may account for the fact that only small quantities of lactic acid have been found in the urine after long periods of exercise
In order to obtain additional data concerning the excretion of lactic acid in urine after strenuous exercise several experiments were carried out on young men using 2 to 3 minute periods of exercise
The normal urines when analyzed by Clausen’s method gave results ranging from 1 to 2.5 mg. of lactic acid excreted in 10 minutes
Summary
This may account for the fact that only small quantities of lactic acid have been found in the urine after long periods of exercise. In order to obtain additional data concerning the excretion of lactic acid in urine after strenuous exercise several experiments were carried out on young men using 2 to 3 minute periods of exercise (stair running). Of lactic acid were excreted after these short periods of strenuous exercise.
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