Concerning exercise treatment for obesity, it is important to know the intensity and duration of exercise to promote effective acceleration of lipids metabolism. This research examined the relation between intensity of exercise and lipids metabolism during and after 20 minutes of treadmill running in 40, 60 and 80% VO₂max after intravenous injection of Heparin. Results are as follows.
1) Triglyceride in the plasma decreased and free fatty acids (FFA) increased both during exercise an rest because of intravenous injection of Heparin.
2) At rest, the respiratory quotient lowerd in proportion to the rise of FFA in the plasma. There is a negative rectilineal relationship between the two.
3) Lipoprotein lipase (LPL) activity in the plasma rose in proportion to the rise in intensity of exercise. Even 90 minutes after the end of exercise, though the LPL activity lowered, this relationship was still maintained.
4) Between LPL activity in the plasma and FFA concentration, a positive rectilineal relationship was observed.
　Considering these results, we can surmise that the rise of FFA concentration is one way to promote consumption of fat even at the time of rest. Acceleration of lipids metabolism depends upon intensity of exercise with in the range of 40-80% VO₂max and consumption of fat increases in proportion to the length of exercise.

DESCENTE SPORTS SCIENCE Vol.2/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE