Human Performance Laboratory, Directorate of Sport, Exercise, and Physiotherapy, University of Salford, Greater Manchester, United Kingdom.
J Strength Cond Res. 2019 Nov;33(11):2953-2961. doi: 10.1519/JSC.0000000000002438.
Dos'Santos, T, Thomas, C, Jones, PA, and Comfort, P. Assessing asymmetries in change of direction speed performance; application of change of direction deficit. J Strength Cond Res 33(11): 2953-2961, 2019-The aims of this study were to quantify asymmetries in change of direction (COD) performance using completion time and COD deficit, and determine its influence on asymmetry profiling of COD ability. A secondary aim was to evaluate the relationship between linear speed, 505 time, and COD deficit. Forty-three youth netball athletes (age: 15.4 ± 1.1 years, height: 1.71 ± 0.06 m, and mass: 63.3 ± 6.6 kg) performed the 505 for both left and right limbs and a 10-m sprint test. Asymmetries in 505 completion time and COD deficit were quantified for dominant (D) (faster) and nondominant (ND) (slower) directions. Paired sample t tests revealed significant differences between D and ND directions for 505 time and COD deficit (p < 0.0001, g = -0.53 to -0.60). Substantially greater asymmetries for COD deficit were observed compared with 505 time (p < 0.0001, g = 1.03). Only 2 subjects displayed an asymmetry ≥10% based on 505 times. Conversely, based on COD deficit, 21 subjects demonstrated asymmetries ≥10%. Large significant associations were observed between 505 time and COD deficit (r = 0.500-0.593, p ≤ 0.002). Large significant inverse associations were demonstrated between 10-m sprint time and COD deficit (r = -0.539 to -0.633, p ≤ 0.001), indicating that faster athletes had longer COD deficits. Nine subjects were classified differently for COD ability when comparing standardized scores for 505 time vs. COD deficit. Quantification of asymmetries in COD ability should be based on COD deficits; inspection of 505 times only could lead to misinterpretations of an athlete's COD symmetry and COD ability. Faster youth netball athletes demonstrate longer COD deficits; thus, researchers and practitioners are encouraged to improve their youth netball athletes' ability to rapidly decelerate, change direction, and reaccelerate from 180° turns.
多斯桑托斯、T、托马斯、C、琼斯、PA 和康福特，P.评估变向速度性能的不对称性；应用变向不足。J 力量与条件研究 33(11)：2953-2961，2019-本研究的目的是使用完成时间和变向不足来量化变向（COD）性能的不对称性，并确定其对 COD 能力不对称分析的影响。次要目的是评估线性速度、505 时间和 COD 不足之间的关系。43 名青年无挡板篮球运动员（年龄：15.4±1.1 岁，身高：1.71±0.06 米，体重：63.3±6.6 公斤）分别在左腿和右腿上进行 505 次和 10 米冲刺测试。对于主导（D）（更快）和非主导（ND）（更慢）方向，对 505 完成时间和 COD 不足进行了不对称性量化。配对样本 t 检验显示 505 时间和 COD 不足在 D 和 ND 方向之间存在显著差异（p<0.0001，g=-0.53 至-0.60）。与 505 时间相比，观察到 COD 不足的不对称性明显更大（p<0.0001，g=1.03）。仅 2 名受试者根据 505 时间显示出≥10%的不对称性。相反，根据 COD 不足，21 名受试者的不对称性≥10%。505 时间和 COD 不足之间存在显著的大关联（r=0.500-0.593，p≤0.002）。10 米冲刺时间和 COD 不足之间表现出显著的负关联（r=-0.539 至-0.633，p≤0.001），表明更快的运动员具有更长的 COD 不足。当比较 505 时间与 COD 不足的标准化得分时，9 名受试者的 COD 能力分类不同。COD 能力的不对称性应基于 COD 不足进行量化；仅检查 505 时间可能导致对运动员的 COD 对称和 COD 能力的错误解释。更快的青年无挡板篮球运动员表现出更长的 COD 不足；因此，鼓励研究人员和从业者提高他们的青年无挡板篮球运动员从 180°转弯快速减速、变向和重新加速的能力。
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