The purpose of this study was to design an interval training method which increases lactic power generation by use of a bicycle ergometer. Sixteen high-school male sprinters (173.8 cm, 65.9 kg, 16.7 yrs) volunteered in this study. Five minutes post exercise blood lactate was analyzed for 10 sec of pedaling at a load of 1.0 kp, 0.075 kp/kgBW and 0.15kp/kgBW. Which at 0.075 kp/kgBW (7.2 mmol/l) was significantly higher than that of 1.0 kp (6.2 mmol/l) and 0.15 kp/kgBW (6.5 mmol/l). Then the post exercise blood lactate level was analyzed for 20, 30 and 40 sec of pedaling at a load of 0.075 kp/kgBW. It was higher in 40 sec (12.1 mmol/l) but, the relation-ship between an each of mean power and post exercise blood lactate accumulation, 10 and 20 sec mean power had a significant relationship.
　For this reason, two interval training models were designed. One was six 20 sec pedaling set at 0.075 kp/kgBW with a 2 min rest (Int 20), the other was three 40 sec pedaling set at the same load with a 5 min rest (int 40). Both training models had 2 min training periods and 10 min rest periods as a whole. After each training, the blood lactate was 13.5 mmol/l (Int 20) and 14.7 mmol/l (Int 40). This suggests that Int 40 was more effective in increasing lactic power generation.
　After one year of training at Int 40, the post exercise blood lactate increased 25.8% (12.0 to 15.1 mmol/l) and 40 sec mean power increased 26.6% (555 to 771 watt) in three amateur cyclists.

DESCENTE SPORTS SCIENCE Vol.18/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE