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.
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