The purpose of the present study was to examine the effects of postactivation potentiation on muscular strength and power after the different intensity of half squat and how long that effects are remained. Eight healthy men (21±2 years old), who are able to squat a minimum load (1.5×body mass), participated in a familiarization session with the test of one repetition maximum (1RM) and in two testing sessions. 80% of 1RM and 40% of 1RM with more than 1 week interval were used as the preload. The magnitude increase in height of loaded (30% of 1RM) counter movement jump (LCMJ) was no difference between 40%1RM and 80%1RM preload. However, an increase in force parameter during LCMJ was appeared in 80%1RM preload but not in 40%1RM. Moreover, an increase in power parameter with 80%1RM preload was remained longer than that of 40% 1RM. These results suggest that the effects of postactivation potentiation on muscular strength and power and its time course of recovery may be different from the intensity of preload.

DESCENTE SPORTS SCIENCE Vol.27/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE