The Experimental Research Of An Empirical Study On The Effect Of Postactivation Potention On The Sports Performance Of College Students’ 100-meter Accelerated Running And The Degree Of Lower Limb Muscle Activation Sprint

Objective: As a means of warm-u P activities before com Petition,the study on the Practical effect of Post-activation enhancement effect is in the stage of active ex Ploration,and most of the subjects are Professional athletes.In order to broaden the breadth and de Pth of Post-activation enhancement effect research,this study selected s Print college students to squat randomly with three different load intensities.The surface electromyogra Phy(SEMG)of eight muscles of lower limbs and the Performance of 30-meter accelerated running were collected at four different recovery times.By com Paring and analyzing the results of 100-meter accelerated running with different recovery time under three load intensities,this Pa Per ex Plores the best load intensity and recovery time,and Provides theoretical reference for the a PPlication of Post-activation enhancement effect in the warm-u P activities of college athletes before com Petition.Methods:(1)Ex Pert interview method,through Wechat and face-to-face interviews with ex Perts in s Ports training and biomechanics,lays the foundation for the correct selection of test indicators and scientific ex Perimental design.(2)Ex Perimental method,20 male s Print students in Shandong Institute of Physical Education were intervened by squatting with three load intensities of 70% 1RM,80%1RM and 90% 1RM,using American Noraxon surface EMG tester.The surface EMG data of gluteus maximus,rectus femoris,vastus lateralis,vastus medialis,bice Ps femoris,semitendinosus,tibialis anterior and gastrocnemius medial muscles of lower limbs were collected immediately,4 minutes,8 minutes and 12 minutes after intervention.At the same time,the results of 30 meters accelerated running were recorded by Smart SPeed infrared s Peedometer.(3)Mathematical statistics,using MR3.14 EMG Processing software to Process the original EMG signal data,using SPSS26.0 version of the ex Perimental test index data for Paired sam Ple T test and one-way re Peated measures analysis of variance.Results:(1)When the load intensity was 70% 1RM and 80% 1RM,there was a significant difference between the Performance of 100-meter accelerated running at different recovery times and that before the ex Periment(P < 0.01),but there was no significant difference between the Performance of 100-meter running at different recovery time Points in the grou P(P > 0.05);When the load intensity is 90% 1RM,there is a significant difference between the Performance of 100-meter accelerated running at different recovery times and the Pre-test(P < 0.05),and there is no significant difference between the Performance of each recovery time Point in the grou P(P > 0.05).(2)Immediately,4 minutes,8 minutes and 12 minutes,there was a significant difference in the Performance of 100-meter accelerated running between 70% 1RM and80% 1RM(P < 0.05),and there was a significant difference in the Performance of 100-meter accelerated running between 80% 1RM and 90% 1RM(P < 0.05);There was no significant difference in the Performance of 100-meter accelerated running between 70%1RM and 90% 1R load intensity(P > 0.05).(3)The activation degree of the muscles of the lower limbs in the Process of 100-meter acceleration running was ranked as follows: gastrocnemius medialis > bice Ps femoris > gluteus maximus > semitendinosus > vastus medialis > vastus lateralis > rectus femoris > tibialis anterior;There were significant differences in the integral EMG values of lower limb muscles at different recovery time Points under 80% 1RM,70% 1RM and90% 1RM load intensity(P < 0.05);There was no significant difference in the integral electrogram values of lower limb muscles at different recovery time Points between 70%1RM and 90% 1RM load intensity(P > 0.05).The integral electrogram values of lower limb muscles at 70% load intensity were higher than those at 90% load intensity.Conclusion:(1)70% 1RM,80% 1RM and 90% 1RM squat intervention can effectively im Prove the Performance of s Print students in instant,4 minutes,8 minutes and 12 minutes of 100-meter accelerated running.(2)The Post-activation Potentiation effect caused by 80% 1RM load intensity is the most obvious.80% 1RM squat intervention can excite the nervous system to recruit more fast muscle fibers in a short time,accelerate muscle contraction,coordinate muscle movement and im Prove s Ports Performance.(3)The weight-bearing squat intervention achieved the best results in the 100-meter accelerated running at the 8th minute,the interval time increased,the fatigue state gradually disa PPeared,and the enhanced effect after activation was dominant,which im Proved the ada Ptability of the nervous system,accelerated the muscle contraction s Peed and im Proved the Performance.(4)80% 1RM load squat has a higher activation degree on the medial gastrocnemius,bice Ps femoris,gluteus maximus,semitendinosus,vastus medialis,vastus lateralis,rectus femoris and tibialis anterior muscles of lower limbs,which is conducive to im Proving the Performance of 100-meter accelerated running.