Experimental Study On The Effect Of Lower-limb Unilateral,Bilateral Complex Training And SAQ Training Program On The Multi-directional Speed Of Collegiate Male Soccer Players

Purpose: With the increasing physical needs of modern soccer,multi-directional speed has become an important factor to win soccer matches.Soccer is a sport with high intensity intermittent combined with speed and strength,and the unilateral training of lower limbs has a high degree of special specificity of soccer,while complex training is an efficient training method to train strength and speed simultaneously in one training session.In addition,SAQ training is an intuitive training method for multi-directional speed.Accordingly,by comparing the training effects of 6 weeks lower-limb unilateral complex training with lower-limb bilateral complex training and Speed Agility Quickness(SAQ)training,this paper explores the suitable training method for collegiate male soccer player in pre-season strength and conditioning aiming to improve multi-directional speed.Methods: this paper mainly uses the literature method,the experiment method,the mathematical statistics method to carry on the research,the experiment recruits 23 athletes of Wuhan Sports University soccer representative team as participans,8 of which have level-1 athlete certificate and 15 of which hold level-2 athlete certificate.Twenty-three subjects were randomly divided into experimental group A(n=7),experimental group B(n=5),experimental group C(n=5)and control group D(n=6).Experimental group A will participate in unilateral lower-limb complex training.Experimental group B will participate in bilateral lower-limb complex training.Experimental group will participate in SAQ training.Control group D group only participate in daily soccer technical and tactical training.After six weeks of training intervention,the kinematics index reflecting the multi-directional speed and the kinetic index reflecting the lower-limb strength and power were tested.All data were collected and analyzed statistically using SPSS 23.0,and the results were analyzed by means of one-way ANOVA LSD test,paired sample T test and Pearson Correlation Coefficient test.Results:(1)Group A(Unilateral)showed strong significant difference in T agility test after the experiment(p<0.01),significant difference was showed in CMJ jump height and relative maximum power(p<0.05),significant difference was showed in left knee peak power of flexor and extensor muscle at 180 ° /s(p<0.01).No significant difference was showed in other indexes(p>0.05).(2)Group B(Bilateral)showed strong significant difference in T agility test(p<0.01),but no significant difference in other indicators(p>0.05).(3)Group C(SAQ group)showed strong significant difference in T agility test(P<0.01),while there was no significant difference in other indicators(p>0.05).(4)Group D(control)showed significant difference in 505 COD test-left leg and T agility test(P<0.05),but there was no significant difference in other indexes(p>0.05),but the indexes of both knees' peak force torque and peak power of flexor and extensor muscle at 60°/s decreased.(5)There were significant differences in T agility test between Group A and Group B/D(p<0.05).There was significant difference in T agility test between Group C and Group B(p<0.05).There was significant difference in left knee peak power of flexor and extensor muscle at 180°/s between the Group A and the Group B(p<0.05),and there was no significant difference between the groups regarding other indexes(p>0.05).(6)There's no significant correlations between T agility performance and part of dynamics indexes in Group A and Group B(p>0.05).T agility performance and part of dynamics indexes in Group C and Group D is negatively correlated(p<0.05).Conclusion:(1)In pre-season period,in addition to the daily technical and tactical training,it is necessary to incorporate unilateral complex training into the S&C training plan to enhance multi-directional speed.(2)Bilateral complex training for six weeks and three times a week during the pre-season period is an effective training method to improve the multi-directional speed,but the effect is lower than that of unilateral compound training in a shorter training period(?6 weeks).(3)SAQ training for six weeks and three times a week during the pre-season period has no significant effect on 505 COD test performance,however it has strong significant effect on T agility performance of adult football players.(4)In pre-season period,nostrength and conditioning and only specific technical and tactical training may not have significant influence on athletes in a shorter training period(?6 weeks),but in a long run,it may decrease soccer player's physical ability.(5)Unilateral and bilateral complex training which takes 6 weeks and 3 times a week in the pre-season period can not complete the transition from lower-limb dynamics indexes to the multidirectional speed indexes,but the speed technique and tactics training can directly lay the training effect of improving multidirectional speed on soccer players.