| Post activation potentiation（Pap）is a phenomenon of short-term enhancement of muscle strength after completing the maximum or near maximum resistance training.This phenomenon is of great significance to sports training and special competition in preventing injury and improving sports performance.Previous studies have shown that PAP has a significant effect on Sports Based on anaerobic energy supply.As we all know,anaerobic energy supply includes the energy supply of prophosphate system and glycolysis.What is the difference in PAP between athletes in the prophosphate system and those in the glycolysis system? The clarification of this problem has certain significance for enriching the relevant theoretical system of PAP and deeply understanding the essential law of PAP.Object:Under the condition of no oxygen energy supply,athletes of the competitive events powered by the original phosphate system and the glycolysis system were induced to squat with 90% one-time maximum（1RM）for 5 times,and then the counter movement jump（CMJ）kicking and stretching tests were carried out at different periods,To observe the kinematics and dynamics of lower limb muscles（biceps femoris,lateral femoris,rectus femoris,medial femoris,gastrocnemius,anterior tibialis）and the changes of integrated electromyography（i EMG）data induced by post activation enhancement effect in athletes of competitive events with energy supplied by prophosphate system and glycolysis system without oxygen.By comparing and analyzing the difference of CMJ between athletes with energy supplied by phosphate system and glycolysis system under the condition of anaerobic energy supply by PAP under different recovery time,this paper discusses the law of PAP of athletes with different modes of anaerobic energy supply.Methods:Fourteen male athletes in anaerobic energy supply events were selected as the experimental subjects,including 7 athletes in the energy supply events of the original phosphate system and 7 athletes in the energy supply events of the glycolysis system.Firstly,vicon software was used to establish a rigid model of athletes’ lower limbs.Secondly,the athletes were tested with CMJ at different recovery times（15s,4min,8min,12 min,16min,20min）after no PAP induction and 5 times of 90%1rm weight-bearing squat induction,During the experiment,vicon infrared high-speed motion capture system and AMTI three-dimensional force measuring platform were used to capture and collect the kinematic and dynamic performance of the test CMJ under different recovery time states before and after the intervention of athletes.Noraxon16 lead telemetry myoelectric instrument was used to record the changes of athletes’ myoelectric data;After sorting out the mean ± standard deviation of the collected kinematics,dynamics and electromyography data,the two-way ANOVA was performed with SPSS 26.0 to observe the size of P value.P>0.05 indicates that there is no significant difference,p<0.05 indicates that there is a significant difference,and p<0.01 indicates that there is a very significant difference;Finally,after consulting the relevant literature,collecting and sorting out,the logical analysis method is used to elaborate and analyze.Results:After 5 times of PAP induction with 90%1rm weight-bearing squats,there was no significant difference in the height of CMJ among athletes with different anaerobic energy supply modes（p>0.05）,but there was significant difference between the two energy supply events with different recovery time under the same energy supply mode（p<0.05）;There was no significant difference in the angles of hip,knee and ankle joints at the peak force of CMJ of athletes in competitive events with different anaerobic energy supply modes（p>0.05）,but there was significant difference in the angles of ankle joints between the two energy supply competitive events with different recovery times under the same energy supply mode（p<0.05）,and there was no significant difference in the rest（p>0.05）;There was no significant difference in the peak ground vertical reaction force,peak impulse,peak power and peak strength development rate of athletes in different anaerobic energy supply modes（p>0.05）,but there was significant difference between the two energy supply events with different recovery time under the same energy supply mode at 8min（p<0.05）;There was significant difference in the integrated myoelectric value of the medial femoral muscle of athletes with different anaerobic energy supply modes（p<0.05）,and there was no significant difference in the integrated myoelectric value of other muscles（biceps femoris,lateral femoral muscle,rectus femoris）（p>0.05）.There was significant difference in the comparison of the two energy supply competitive events with different recovery time under the same energy supply mode（p<0.05）,and the difference was There was significant difference in the integrated electromyogram values at 16 min（p<0.05）,but there was no significant difference in the integrated electromyogram values of other muscles（gastrocnemius and tibialis anterior muscle）（p>0.05）.Conclusion:After 5 times of 90%1rm weight-bearing squat stimulation,the athletes of the two energy supply modes could successfully induce PAP phenomenon,and reached the highest at8min;The height of squat jump is positively correlated with the change trend of hip joint at the peak force of squat jump;The height of squat jump and the development rate of peak strength of athletes with glycolysis system energy supply at different recovery time showed a continuous upward trend,while the athletes with phosphate system energy supply showed a downward trend;PAP is targeted to activate muscle activity of athletes in two anaerobic energy supply modes.After the induction of PAP,the athletes of the energy supplying events with the phosphogen system mainly focused on the effect on the rectus femoris muscle,while the athletes of the competitive events with the energy supplying system with the glycolysis system had an effect on the medial femoris muscle after the induction of PAP. |
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