The purpose of this study was to determine lactate threshold (LT) from the change of blood lactate accumulation (BLa) during the improved multi stage shuttle run test and to clarify the relationship between LT and maximal lactate steady state (MaxLass) by using the constant load shuttle run test for 20 minutes for the soccer player. The subjects were ten male in the university soccer club. In the improved multi stage shuttle run test, LT was clearly decided from the change of BLa to the running speed. The running speed at the LT was significantly higher than that of MaxLass in the constant speed shuttle run test for 20 minutes (p<0.001) and they showed a significant correlation (p<0.05). BLa at LT in the improved multi stage shuttle run test was significantly lower than average BLa of the constant load shuttle run test at MaxLass. Moreover, Maximum BLa in the constant load shuttle run at LT was significantly higher than that in the constant load shuttle run at MaxLass. On the other hand, there was no significant difference between average HR at LT and that at MaxLass in the constant load shuttle run test. It is thought that the improved multi stage shuttle run test for the determination of LT seems a very effective method for the coach and the player.

DESCENTE SPORTS SCIENCE Vol.24/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE