Research On The Effect Of 6-Week Balance Training On Improving The Ability Of Change Of Direction In Male College Badminton Players

Background:Change of direction ability(CODA)is a key influence factor of college badminton player’s performance.Plyometric training is a common and effective method by improving athlete’s power of lower limbs to improve CODA at present,but the effect of plyometric training is often affected by assessment methods of CODA,training period,and training frequency.Many factors are influencing the CODA.In addition to the power factor,the balance ability is also an important factor influencing the change of direction ability.Objective:To investigate the effect of plyometric training on the different CODA and the effect of plyometric training with different training periods and frequencies on the CODA by using systematic review and meta-analysis,to provide the theoretical basis for experimental design.Next,to investigate the effect of plyometric combined with balance training on college badminton player’s CODA.Methods:A search strategy based on the PICOS principle was used to search the databases of CNKI,PubMed,Web of Science,SPORTDiscus,and literature screening based on inclusion and exclusion criteria.The PEDro scale was used to assess the methodological quality of the included studies.The heterogeneity,data combining,subgroup analyses,producing forest plot,producing funnel plot,publication bias were assessed with Stata 14.0 and Revman 5.3 software.Sixteen male college badminton players volunteered to participate and were randomly assigned to a balance-plyometric group(BP:n=8)and plyometric group(PL:n=8).The BP group performed balance combined with plyometric training three times a week over 6 weeks;while the PL group undertook only plyometric training three times a week during the same period.Meanwhile,both groups carried out the same technical training.All participants were tested to assess the change of direction ability:(SEMO test and 5-05 test),dynamic balance ability(Y-Balance test),and reactive strength index(RSI)before and after the training period.Results:(1)A total of 23 articles were included in the systematic review,17 articles were included in the meta-analysis,the PEDro scale shows articles have high quality.(2)The systematic review found that among the 23 included literature,18 of them reported that plyometric training can significantly improve the performance of subjects in the experimental group in the T-test,Illinois test,and other COD tests.(3)The meta-analysis found that plyometric training can significantly improve the performance of the T-test[SMD=-1.19(-1.66,-0.71),large effect,p<0.00001,I2=60%,χ2=22.3,p=0.007],and Illinois test[SMD=-0.61(0.98,-0.23),moderate effect,p=0.002,I2=47%,χ2=1 1.25,p=0.08],but plyometric training cannot improve 5-0-5 test performance[SMD=-0.13(-0.61,0.35),small effect,p=0.59,I2=22%,χ2=3.83,p=0.28].(4)The meta-regression found that within 6-12 weeks,with the extension of the training period,the effect size also increases.When the training period is 12 weeks,the effect size is the largest.Within the training frequency range of-3 times,as the training frequency increases,the effect size also increases.When the training frequency reaches 3 times a week,the effect size is the largest.(5)There was a significant within-group improvement in the SEMO test for both the BP group(ES=1.55,p<0.05)and PL group(ES=0.81,p<0.05),and effect size were higher for BP when compared to PL;(6)There was a significant within-group improvement in 5-0-5 test for both BP group(ES=1.55,p<0.05)and PL group(ES=0.61,p<0.05),and BP group were significantly higher than PL group(p<0.05).(7)Significant within-group improvements in the dynamic balance ability were shown in the BP group,at both dominant legs(ES=1.20,p<0.05)and non-dominant leg(ES=1.31,p<0.05),which were significantly higher than the PL group(ES=0.12 and 0.18,p<0.05).(8)There was a significant within-group improvement in RSI for both the BP group(ES=1.76,p<0.05)and PL group(ES=0.96,p<0.05),and the BP group were significantly higher than the PL group(p<0.05).Conclusion:(1)The plyometric training has a positive effect on the CODA of different ages and different sports level subjects.(2)plyometric combined with balance training not only could further improve the change of direction performance of badminton athletes than plyometric training alone but also could improve the balance and RSI.