| Postactivation potentiation（PAP）is an immediate effect,which refers to the acute increase in explosive force caused by the body through a short time of high-intensity practice in advance.Purpose of research:This experiment investigated the effect of low（1×5×85%1RM）,medium（2×5×85%1RM）and high（3×5×85%1RM）activation on lower limb burst in sprinters.It provides a reference for sprinters to use the activated load volume before the race warm-up.Research methods: Using literature review method,expert interview method,mathematical statistics method and experimental method,and ten male sprinters from the school of Physical Education were subjected to squat intervention with three loads of low（5×85%1RM）,medium（2×5×85%1RM）and high（3×5×85%1RM）,counter movement jump（CMJ）,standing long jump and 30-meter run were tested immediately,5 minutes,10 minutes and 15 minutes after the intervention,to analyze the changes of each test index.Results: The CMJ height of low load squats increased significantly at 5 min after intervention,and CMJ height,standing long jump and 30 m running performance increased significantly at 10 min after intervention.（2）CMJ height was significantly improved 5minutes after the intervention of medium-load squat training,and standing long jump and30-meter running performance were significantly improved 10 minutes after the intervention.（3）The performance of standing long jump immediately after the intervention of high load squat training decreased significantly.Conclusion:（1）The power of Sprinter was significantly improved after squat intervention with low（1×5×85%1RM）and medium（2×5×85%1RM）loads.（2）Sprinters’ power will decrease in a short time after squat intervention with high load.（3）The power of increased significantly 5 minutes and 10 minutes after the intervention of low and medium loads,and there was no significant difference in the power after the intervention of the two loads. |
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