Purpose The aim of the study was to establish the optimum variable resistance(VR)intensity for loaded countermovement jump(LCMJ)to induce post-activation potentiation(PAP).Methods Eleven male athletes(age 23±2.3 ...Purpose The aim of the study was to establish the optimum variable resistance(VR)intensity for loaded countermovement jump(LCMJ)to induce post-activation potentiation(PAP).Methods Eleven male athletes(age 23±2.3 years,height 1.77±0.05 m,body mass 73.7±9.0 kg)attended one familiariza-tion and four testing sessions.Subjects performed their own pre-competition warm up before performing two countermove-ment jumps(CMJ)for baseline measure.Subsequently,they performed 2×3 unloaded(UCMJ)or loaded CMJ(LCMJ)with one of the three VR intensities,Orange(6.7±0.6 kg),Red(14.0±0.9 kg)and Blue(24.0±1.4 kg),in random order,before performing two more CMJ for post-test measure.Each testing session was separated by at least 48 h.Results There was significant increase in jump height in all conditions(P<0.05),but no significant difference in change in jump height between conditions(P>0.05).There were small to moderate effect when comparing Orange and the other conditions.Peak force and velocity increased in Red(P<0.05)and Orange(P<0.05),respectively.Change in jump height was significantly correlated to change in peak velocity(r=0.46,P=0.002)and peak power(r=0.46,P=0.002).Conclusion The findings of the study showed that UCMJ and LCMJ were effective in improving jump height acutely,and an intensity level of about 10%body weight contributed by VR seems to be the optimum resistance level.展开更多
文摘Purpose The aim of the study was to establish the optimum variable resistance(VR)intensity for loaded countermovement jump(LCMJ)to induce post-activation potentiation(PAP).Methods Eleven male athletes(age 23±2.3 years,height 1.77±0.05 m,body mass 73.7±9.0 kg)attended one familiariza-tion and four testing sessions.Subjects performed their own pre-competition warm up before performing two countermove-ment jumps(CMJ)for baseline measure.Subsequently,they performed 2×3 unloaded(UCMJ)or loaded CMJ(LCMJ)with one of the three VR intensities,Orange(6.7±0.6 kg),Red(14.0±0.9 kg)and Blue(24.0±1.4 kg),in random order,before performing two more CMJ for post-test measure.Each testing session was separated by at least 48 h.Results There was significant increase in jump height in all conditions(P<0.05),but no significant difference in change in jump height between conditions(P>0.05).There were small to moderate effect when comparing Orange and the other conditions.Peak force and velocity increased in Red(P<0.05)and Orange(P<0.05),respectively.Change in jump height was significantly correlated to change in peak velocity(r=0.46,P=0.002)and peak power(r=0.46,P=0.002).Conclusion The findings of the study showed that UCMJ and LCMJ were effective in improving jump height acutely,and an intensity level of about 10%body weight contributed by VR seems to be the optimum resistance level.
