Effect Of Acute Vibration Warm-up On The Lower Limb Strength And Bilateral Limb Ratio In Young Males

Research objective: The purpose of this study was to observe the effects of vibration warm-up and conventional warm-up on lower limb muscle strength and the differences in the effects of Bilateral Limb Ratio(BLR).At the same time,it analyzes the effects of acute vibration stimulation on the muscle surface of lower limb muscles,explores the possible neuromuscular mechanisms of related changes,and provides a reference for more scientific use of vibration stimulation to warm up in the future.Research methods: The subjects in this experiment were 12 male students from Beijing Sport University.After vibration warm-up or normal warm-up,test the maximum isometric strength of the legs,dominant legs and non-dominant legs of the test subjects,and collect both Vastus Lateralis(VL),Vastus Medialis(VM),Rectus Femoris(RF)And the electromyography signal of the lateral gastrocnemius(LG)surface,General warm-up content includes 200-meter jogging,two groups,10times/group squat exercises,two groups,10/group lunge squat exercises;vibration warm-up except 200-meter jogging,other movements are performed on the vibration trainer The action and flow are the same as the ordinary warm-up,with a vibration frequency of 30 Hz and an amplitude of 2 mm.Determine the dominant leg and the non-dominant leg according to the peak value of the maximum equal-length pedal force after ordinary warm-up.Using paired T test and non-parametric test method for statistical analysis of the experimental data,with P≤ 0.05 as the significance level.Research results:(1)Compared with the normal warm-up,the subjects’ peak isometric force and the Bilateral Limb Ratio did not change significantly after warm-up(P>0.05),There was no significant change in the time it took for the subject to reach the peak strength after the maximal isometric leg press(P>0.05).(2)Compared with the normal warm-up,The non-dominant leg’s power rate of force development(RFD)in the 0-100 ms phase has a significant increase(P=0.004),from2177.50±1230.49N/s to 3492.50±1785.16N/s.(3)Compared with the normal warm-up,the Root Mean Square of the Vastus Lateralis and Rectus Femoris in the maximum isometric leg press of the non-dominant leg after vibration warm-up increased significantly from 0 to 100 ms.The Root Mean Square of the Vastus Lateralis increased from 172.92±83.62 mv to 219.79±97.53mv(P=0.05),and the Root Mean Square of Rectus Femoris increased from 54.36±17.04 mv to 78.61±38.23mv(P=0.036).(4)Compared with normal warm-up,the Root Mean Square of the Vastus Lateralis of the subjects with maximum isometric leg press of one leg after vibration warm-up was significantly reduced(P<0.05),and the Root Mean Square of the Vastus Lateralis of the dominant leg decreased from 522.26±157.69 mv to 461.78±186.23mv(P=0.03);the Root Mean Square of the non-dominant leg Vastus Lateralis It decreased from 552.45±209.17 mv to 457.70±185.93mv(P=0.042).There were no significant changes in other indicators(P>0.05).Conclusion:(1)Low-intensity acute vibration stimulation cannot effectively increase the peak force of the maximum isometric leg press of the lower limbs or affect the Bilateral Limb Ratio of the lower limbs.(2)Compared with ordinary warm-up,acute vibration warm-up can better improve the function of the non-dominant leg’s neuromuscular system,and improve the ability of the non-dominant leg’s maximum isometric leg press to quickly exert force.