Faculty of Arts and Sciences, Kyoto Institute of Technology, Kyoto, Japan.
Sports Science Center, Osaka University of Health and Sport Sciences, Senangun, Japan.
Int J Sports Physiol Perform. 2024 Aug 27;19(11):1256-1263. doi: 10.1123/ijspp.2024-0006. Print 2024 Nov 1.
Jump and linear sprint performances both correlate with pro-agility performance. However, correlation does not imply causation, and potential confounders may affect the correlation. Therefore, this study aimed to determine the relationship between change-of-direction (COD) performance and COD deficits (COD-D) in linear-sprint and countermovement-jump (CMJ) -related performance using multiple stepwise linear-regression models.
The study included 42 female national-level intercollegiate athletes. The 10- and 20-m linear-sprint and pro-agility times, COD-D, CMJ height, and phase-specific force production and rate of force development during eccentric unloading, eccentric braking, and the concentric phases of CMJ were measured. Stepwise linear-regression analyses were used to predict the factors related to COD and COD-D.
CMJ height was the sole predictor in the 10-m pro-agility model (adjusted R2 = .234, P = .001). Modified Reactive Strength Index (standardized coefficient, -.710) and the lowest center-of-mass depth during the CMJ (standardized coefficient, .323) were predictors in the 20-m pro-agility model (adjusted R2 = .330, P < .001). For the 10- and 20-m COD-D models, the rate of force development at 30 and 60 milliseconds, respectively, during the concentric phase was the only predictor of performance (adjusted R2 = .183, P = .003 and .237, P = .001, respectively).
These results suggest that athletes should concentrate on improving their CMJ height, increasing their ability to lower their center of mass more deeply, and increasing their instantaneous force-production abilities immediately after the eccentric braking phase of CMJ to improve their COD performance.
跳跃和直线冲刺表现均与敏捷性表现相关。然而，相关性并不意味着因果关系，潜在的混杂因素可能会影响相关性。因此，本研究旨在使用多个逐步线性回归模型确定直线冲刺和反向动作跳（CMJ）相关表现中的变向（COD）表现与 COD 缺陷（COD-D）之间的关系。
本研究纳入了 42 名国家一级大学间运动员。测量了 10 米和 20 米直线冲刺和敏捷性时间、COD-D、CMJ 高度以及离心卸载、离心制动和 CMJ 向心阶段的特定阶段力量产生和力量发展率。使用逐步线性回归分析来预测与 COD 和 COD-D 相关的因素。
CMJ 高度是 10 米敏捷性模型中的唯一预测因素（调整后的 R2 =.234，P =.001）。改良反应强度指数（标准化系数，-.710）和 CMJ 中最低的质心深度（标准化系数，.323）是 20 米敏捷性模型的预测因素（调整后的 R2 =.330，P <.001）。对于 10 米和 20 米 COD-D 模型，在向心阶段分别为 30 毫秒和 60 毫秒时的力量发展率是唯一的表现预测因素（调整后的 R2 =.183，P =.003 和.237，P =.001）。
这些结果表明，运动员应集中精力提高 CMJ 高度，增加质心下降的深度，并提高 CMJ 离心制动阶段后立即产生瞬时力量的能力，以提高 COD 表现。
