Abstract
Experiments have been performed on men to test the validity of the relation found to exist, by Hartree and Hill, in the case of the isolated muscle, between the speed of the oxidative removal of lactic acid in recovery and its concentration in the muscle at the same time. In men, as well as in the isolated muscle, it has been found that the rate of removal of lactic acid, as measured by the O intake, is proportional to the square of the lactic acid concentration in the fluids which are in contact with the muscle fibers. Lactic acid apparently acts as a "governor of oxidation" in the recovery process of muscle.

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