Influence Of Lower Extremity Strength And Recovery Time After The Heavy Resistance Training On Postactivation Potentiation

Postactivation potentiation (PAP) is the transient increase in muscle contractile performance after previous contractile activity.The effect of PAP is affected by several variables including conditioning contraction volume and intensity, recovery period following the conditioning contraction, type of conditioning contraction, type of subsequent activity, and subject characteristics. To date, there is no uniform agreement about the optimal acute recovery required between the heavy resistance training and subsequent muscle performance and the strength quality to gain performance benefits.Object:The aim of the present study was to determine the recovery time and strength quality required to observe enhanced muscle performance following a bout of heavy resistance training.Method:Twenty three male students of Beijing sports university performed a countermovement jump at baseline and4,8,12,16and20,after a bout of heavy resistance training (a set of five repetitions at90%one-repetition maximum half back-squat1min interval).According to1RM/body weight of subjects grouping, L group(n=12) is classified1RM/body weight>2, S group(n=11) is classified1RM/body weight≤2. Peak power output, jump height, peak impulse, peak rate of force development, the range of motion and the angular velocity on the moment of peak force were determined for all countermovement jumps. Using repeated-measures ANOVA method analysis the effect of recovery time. Using multivariate analysis compared the effect of lower extremity strength. Significant error is defined as the probability of a class of less than0.05.Result:Participants’ Peak output power increased significantly following4min and8min recovery (P<0.008), but there is no significant increase on other index(P>0.05). In addition there is no significant difference between L group and S group.Conclusion:The findings suggest muscle performance during a countermovement jump can be markedly enhanced followinga set of five repetitions at90% one-repetition maximum half back-squat1min interval provided that adequate recovery (4min and8min) is allowed between the heavy resistance training and the explosive activity. But power is not effectively translate into increased athletic performance. Effect on the relative strength of the lower limbs of PAP were not significantly different, but the smaller group of the relative strength in this study may show longer enhancement. Enhance of the performence did not reflect on the kinematics.There is a significant individual difference on the enhancement of lower limb explosive performencn.