中国优秀U17男子足球运动员下肢肌肉力量比率与变向能力的关系

目的:探究中国优秀U17男子足球运动员的下肢腘绳肌/股四头肌肌力比率(hamstring/quadriceps ratio,H/Q比率)和变向能力的相关关系,为提升U17男子足球运动员的变向能力及预防下肢损伤提供依据。方法:对47名中国优秀U17男子足球运动员进行股四头肌和腘绳肌的向心收缩、离心收缩等速测试,并分别计算双下肢不同角速度下的传统H/Q比率(腘绳肌向心收缩峰值力矩/股四头肌向心收缩峰值力矩)和功能H/Q比率(腘绳肌离心收缩峰值力矩/股四头肌向心收缩峰值力矩)。同时,采用T型测试评价变向能力。采用皮尔逊相关探讨各比率和变向能力之间的相关性,并对存在相关的H/Q比率与变向能力进行多元回归分析。结果:非优势侧高速传统H/Q比率(r=0.44,P=0.002)、优势侧低速功能H/Q比率(r=-0.358,P=0.013)与T型测试成绩均存在显著性相关;两个变量可以共同解释T型测试成绩总方差的28.2%(R²=0.282,F=8.640,P<0.01)。结论:对于中国优秀U17男子足球运动员而言,优势侧低速功能H/Q比率越大、非优势侧高速传统H/Q比率越小...

Relationships between Lower Extremity Muscle Strength Ratio and the Ability of Changing Directions of Chinese Elite U17 Male Soccer Players

Objective To explore the relationship between lower extremity muscle strength hamstring/quadriceps(H/Q)ratios and the ability of changing directions of U17 youth elite soccer players,in or der to improve the performance of changing directions and prevent injuries of the lower extremity.Methods Forty-seven Chinese U17 youth elite soccer players were selected and given the concentric and eccentric isokinetic tests of quadriceps and hamstrings,and the conventional H/Q ratio(hamstring concentric peak torque/quadriceps concentric peak torque)and functional H/Q ratio(hamstring eccentric peak torque/quadriceps concentric peak torque)were calculated respectively.Meanwhile,the T agility test was used to evaluate the ability of changing directions.The correlation between the average H/Q ratio and T agility test score were analyzed using the Pearson correlation analysis and multiple linear regression method.Results Both non-dominant high-speed conventional H/Q ratio and dominant lowspeed functional H/Q ratio with T agility test had significant correlations with the average T agility test score(r=0.44,P=0.002;r=-0.358,P=0.013),with the former two variables accounting for 28.2%of the total variance of the latter(R^2=0.282,F=8.640,P<0.01).Conclusions U17 youth elite soccer players with higher dominant low-speed functional H/Q ratio and less non-dominant high-speed conventional H/Q ratio have higher speed of changing directions.Non-dominant high-speed conventional H/Q ratio and dominant low-speed functional H/Q ratio can predict the T agility test results,with the non-domi nant high-speed conventional H/Q ratio of a greater impact on the ability to change directions.