Experimental Study On The Effect Of Post-activation Enhancement On Lower Limb Power Output And Surface Electromyographic Signals Of Male Sprinter

Currently,the positive impact of post activation enhancement effect(PAP)on sports dominated by the prophosphate energy supply system has been confirmed,but there are relatively few relevant studies on the impact of some sports with a longer duration and also dominated by explosive power.Research purpose: This paper explores the effect of post-activation enhancement on the output power of lower limb muscles and surface electromyographic signals through experiments,in order to provide reference for the daily training arrangement of sprint events and the content selection of pre-competition warm-up,improve athletes’ sports performance,and expand previous research in this field.Research methods: This article mainly adopts the methods of literature,experiment,mathematical statistics,and logical analysis.The experimental subjects were 10 male sprinters at or above the national level 2 majoring in sports training at Tianjin Institute of Physical Education.In the experiment,the subjects were arranged to undergo an anaerobic power bicycle experiment for 30 seconds after warm-up,and the power data and surface EMG signals for 30 seconds were recorded synchronously;The PAP intervention experiment consisted of arranging subjects to receive PAP induction after warm-up,and then conducting an anaerobic power bicycle test,while recording changes in lower limb output power and muscle surface myoelectric signals;After the experiment,SPSS 22.0 software was used to analyze the power data and EMG data before and after PAP intervention.Research findings:1.After analyzing the power data in the experiment in intervals of 5 seconds,it is found that: there was a significant difference in the average power data of the subjects between 0-25s(P < 0.05);The relative average power data showed significant differences in the 0-15 s range(P<0.05);The number of pedaling laps showed a significant difference during the 5-10 s period(P<0.05);Through direct analysis of the total data from the 30 s Wingate experiment,it was found that there were significant differences in peak power,relative peak power,average power,relative average power,number of pedals,and total power(P<0.05),but there was no statistical difference in the rate of anaerobic power reduction(P>0.05).2.After segmented analysis of the integrated electromyography data in the experiment with a 5-second interval,it was found that there was a significant difference in the integrated electromyography values of the medial femoral muscle between 0-25seconds(P<0.05);There was a significant difference in the integrated electromyographic value of the lateral femoral muscle between 5-25 seconds(P<0.05);The integrated EMG of rectus femoris,biceps femoris muscle,medial head of gastrocnemius muscle,and lateral head of gastrocnemius muscle had no statistical difference(P>0.05).3.After segmented analysis of the average power frequency data in the experiment with a 5-second interval,it was found that the average power frequency of the lateral femoral muscle showed significant differences between the 0-5s and 15-20 s intervals(P<0.05);The average power frequency of medial femoral muscle,lateral femoral muscle,biceps femoris muscle,medial head and lateral head of gastrocnemius muscle had no statistical difference(P>0.05).Research conclusions:1.PAP intervention can enhance the ability of male sprinters to use the prophosphate energy supply system during high-intensity anaerobic exercise,improve muscle explosive power in a short period of time,and help athletes improve athletic performance.2.PAP intervention can enhance the ability of the glycolytic energy supply system of male sprinters during high-intensity anaerobic exercise,thereby enabling the muscles to maintain a high output power and improving the total work done by the muscles within a certain period of time.3.PAP intervention can improve the ability of the central nervous system to recruit motor units during high-intensity anaerobic exercise in male sprinters,improve muscle activation,contraction speed,and maximum muscle contraction strength,thereby improving athletes’ movement speed,and improving muscle output power per unit time4.PAP intervention has no significant impact on the anaerobic power reduction rate of male sprinters during high-intensity anaerobic exercise,and will not deepen muscle fatigue in the following work.