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The Role of Eccentric Strength in 180° Turns in Female Soccer Players

机译：偏心力量在女子足球运动员180度转弯中的作用

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Previous studies have reported an association between eccentric strength (ECC-STR) and change of direction (COD) ability. Little is known about how ECC-STR facilitates COD maneuvers. The aim of this study was to examine the role of ECC-STR during a 180° COD task in 18 female soccer players. Each player performed six trials of a 180° COD task whereby three-dimensional motion data from 10 Qualisys Pro-Reflex infrared cameras (240 Hz) and ground reaction forces (GRFs) from two AMTI force platforms (1200 Hz) were collected. Relative eccentric knee extensor (ECC-EXT) and flexor (ECC-FLEX) peak torque was collected from both limbs at 60°·s−1 using a Kin Com isokinetic dynamometer. Large correlations were revealed between COD performance (time to complete 5 m approach, 180° turn, 5 m return) and ECC-EXT (R = −0.674) and ECC-FLEX (R = −0.603). Moderate to large correlations were observed between approach velocity (AV) and COD performance (R = −0.484) and ECC-EXT (R = 0.724). Stronger participants (n = 9) recorded significantly (p < 0.05) faster AV (4.01 ± 0.18 vs. 3.74 ± 0.24 m·s−1, d = 1.27) and a greater reduction in velocity (−1.55 ± 0.17 vs. −1.37 ± 0.21 m·s−1, d = −0.94) during penultimate contact than weaker (n = 9) subjects. Greater ECC-STR is associated with faster COD performance in female soccer players, as stronger players are better able to decelerate during penultimate contact from faster approach velocities.
机译：先前的研究已经报道了偏心强度（ECC-STR）与方向变化（COD）能力之间的关联。对于ECC-STR如何促进COD操纵知之甚少。这项研究的目的是检查ECC-STR在18位女足球运动员进行180°COD任务期间的作用。每个玩家对180°COD任务进行了六次试验，收集了来自10台Qualisys Pro-Reflex红外摄像机（240 Hz）的三维运动数据和来自两个AMTI力平台（1200 Hz）的地面反作用力（GRF）。使用Kin Com等速测力计在60°·s -1 处从双侧肢体收集相对偏心膝伸肌（ECC-EXT）和屈肌屈肌（ECC-FLEX）峰值扭矩。揭示了COD性能（完成5 m进场时间，180°转弯，返回5 m的时间）与ECC-EXT（R = -0.674）和ECC-FLEX（R = -0.603）之间的相关性。在进场速度（AV）与COD性能（R =​​ -0.484）和ECC-EXT（R = 0.724）之间观察到中度到较大的相关性。较强的参与者（n = 9）记录的AV明显更快（p <0.05）（4.01±0.18 vs. 3.74±0.24 m·s -1 ，d = 1.27），并且速度下降更大（-与较弱（n = 9）受试者相比，倒数第二次接触时为1.55±0.17 vs.-1.37±0.21 m·s -1 ，d = -0.94）。更高的ECC-STR与女足球运动员更快的COD性能相关联，因为更强的运动员在倒数第二次接触时能更快地减速。

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