The Influence of Post-activation Potentiation Based on Drop Jump Exercises on the Acceleration Sprinting and Muscle-tendon Stiffness of Elite Male Sprinters
Post-activation potentiation(PAP)is a strategy aimed at acutely enhancing athletes'explosive power through specific high-load training.A randomized crossover controlled trial was conducted,recruiting 24 elite male sprinters.They performed drop jump(DJ)exercises under two conditions:without load(DJ group)and with a 20％bodyweight vest load(WDJ group),with measurements taken at different recovery times(4,8,and 12 min)to assess their 0～20m acceleration performance and muscle-tendon stiffness.The aim was to evaluate how drop jumps under different loading conditions effectively utilize PAP to improve acceleration performance in elite male sprinters.The results showed that both conditions significantly improved0～20m acceleration performance.At 8 minutes,the DJ group and WDJ group improved by 0.061 s(p＜0.05)and 0.050 s(p＜0.05),respectively,while at 12 minutes,they improved by 0.061s(p＜0.01)and 0.054 s(p＜0.0 1).The WDJ group significantly increased step length(by an average of 2.290～3.040 cm,p＜0.0 1)and ground contact time(by an average of 0.008～0.015ss,p＜0.01),while the DJ group significantly improved step frequency(by an average of 0.071～0.084 Hz,p＜0.05).Additionally,the WDJ group demonstrated greater improvement in biceps femoris stiffness(average increase of 10.708～16.875 N/m,p＜0.001).Conclusions:1)Both DJ and WDJ exercises effectively induced PAP,significantly improving acceleration performance and muscle-tendon stiffness within the 4～12 minute recovery period.The enhancement of muscle-tendon stiffness may be one of the mechanisms by which PAP improves performance;2)DJ exercises are more effective in improving step frequency,while WDJ exercises are better at increasing step length and ground contact time.This suggests that the two exercises have different advantages in optimizing acceleration parameters.Coaches can choose between DJ and WDJ exercises based on individual athlete needs and weaknesses to fully optimize performance parameters and enhance acceleration ability.
万方数据
维普
