Abstract
It is now generally agreed that pyruvic acid holds a keyposition in the intermediary metabolism of carbohydrate, participating in both the anaerobic and aerobic cycles. Lactic acid is derived by reduction of pyruvic acid, and its complete oxidation requires oxygen and diphosphothiamine. In severee strenuous exercise, these metabolites accumulate in blood in a paralell manner, namely pyruvic acid shows the similar trend as does lactic acid (1) .
In the previous paper (2) we presented data showing that moderate exercise, which was continued for a fairly long time, had little effect on the levels on the acids, but both acids were increased markedly after strenuous exercise. In this paper, we shall present the more precisely followed curves of pyruvic and lactic acid concentrations of the blood after muscular activities of various grade.
