This study was focused on the carbohydrate and lipid metabolism during moderate exercise. Four healthy male students were participated in this experiments. After maximal exercise testing on treadmill running, each relative intensity, the loads responsible for 40% and 60% maximal oxygen intake, were determined. Treadmill running continued 30 minutes and blood sampling were done at rest and 5 min. intervals. Blood components were analyzed.
　Blood sugar values didn't change during both exercise. Serum free fatty acids values (FFA) decreased during initial stage of exercise, and then in 40% VO₂ max exercise FFA were unchanged, in 60% VO₂max increased gradually. Serum triglycerides values (TG) decreased gradually during both exercise. Blood Lipo-protein lipase activities reached maximal level at the end of exercise in 40% VO₂max and 10 min. after exercise in 60% VO₂max.
　In conclusion, the changes in blood components were small during moderate exercise, but, lipid metabolism was accelerated rapidly.

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