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《Chinese Journal of Sports Medicine》 2018-09
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Effects of FIFA 11+ on Knee Muscle Strength in Youth Amateur Football Players

Xu Jincheng;Hu Shuiqing;Sun Tianlong;Li Yong;Mi Yixiang;Gao Can;Yang Lichuan;Wang Jun;Wang Xiao;Chen Shuo;Wu Jianmei;Hui Chunyu;Lin Xu;Meng Ru;China Institute of Sport Science;Chaoyang Branch,Beijing Chenjinglun Middle School;National Institute of Sports Medicine;Beijing MR Sports Culture Development Co.,Ltd.;  
Objective To explore the effect of FIFA 11+ on isokinetic knee strength of youth ama-teur football players. Methods Sixteen youth amateur football players from the same junior middleschool were randomly and equally divided into an FIFA 11+ and a control group. The dominant kick-ing legs of all players were the right ones. All players in the FIFA 11+ group practiced FIFA 11+twice a week as a warm-up program before starting regular training,while the control group kept theirregular warm-up practice for the whole study lasting for eight weeks. The gap in isokinetic kneestrength before and after the intervention was analyzed and compared between groups. Concentric iso-kinetic test protocols for knee joints were used to measure the knee flexor and extensor musclestrength at two angular velocities of 60°/s and 180°/s. Results After the intervention,the improvement of the peak torque,relative peak torque,peak power and relative peak power of the left knee flexion(non-dominant hamstrings) at 60°/s was more significant in the FIFA 11+ group,compared with the controlgroup(P0.05 or P0.01). On the contrary,no similar significance was found in the right legs(P0.05).There were also no significant changes in the isokinetic tests of the left and right knee extensors(quadri-ceps) at 60°/s. Moreover,there was no difference between the FIFA 11+ and control groups in pre-topost-test changes of knee strength at 180°/s. Conclusions Eight-week FIFA 11+ training can effectivelyimprove the hamstring strength of the non-dominant legs of youth amateur football players.
【Fund】: 人社部2016年度留学人员科技活动择优资助项目(委2016-19);; 国家体育总局全民健身研究领域课题(2015B050);国家体育总局体育科学研究所基本科研业务费资助课题(基本2017-35、2016-20)共同资助;; 中国足球协会青少年足球科研课题(2016-6)
【CateGory Index】: G843
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