Dos'Santos Thomas, Thomas Christopher, Comfort Paul, Jones Paul A
Human Performance Laboratory, Directorate of Sport, Exercise, and Physiotherapy, University of Salford, Greater Manchester, United Kingdom.
Department of Sport and Exercise Sciences, Musculoskeletal Science and Sports Medicine Research Center, Manchester Metropolitan University, Manchester, United Kingdom ; and.
J Strength Cond Res. 2022 Oct 1;36(10):2780-2791. doi: 10.1519/JSC.0000000000003950. Epub 2021 Mar 2.
Dos'Santos, T, Thomas, C, Comfort, P, and Jones, PA. Biomechanical effects of a 6-week change of direction speed and technique modification intervention: implications for change of direction side step performance. J Strength Cond Res 36(10): 2780-2791, 2022-The aim of this study was to evaluate the biomechanical effects of change of direction (COD) speed and technique modification training on COD performance (completion time, ground contact time [GCT], and exit velocity) during 45° (CUT45) and 90° (CUT90) side step cutting. A nonrandomized, controlled 6-week intervention study was administrated. Fifteen male, multidirectional, sport athletes (age, 23.5 ± 5.2 years; height, 1.80 ± 0.05 m; mass, 81.6 ± 11.4 kg) formed the intervention group (IG) who participated in two 30-minute COD speed and technique modification sessions per week, whereas 12 male, multidirectional, sport athletes (age, 22.2 ± 5.0 years; height, 1.76 ± 0.08 m; mass, 72.7 ± 12.4 kg) formed the control group (CG) and continued their normal training. All subjects performed 6 trials of the CUT45 and CUT90 task whereby pre-to-post intervention changes in lower-limb and trunk kinetics and kinematics were evaluated using 3-dimensional motion and ground reaction force analyses. Two-way mixed analysis of variances revealed significant main effects for time (pre-to-post changes) for CUT45 completion time, exit velocity, and CUT90 completion time ( p ≤ 0.045; η 2 = 0.152-0.539), and significant interaction effects of time and group were observed for CUT45 completion time, GCT, exit velocity, and CUT90 completion time ( p ≤ 0.010; η 2 = 0.239-0.483), with the IG displaying superior performance postintervention compared with the CG ( p ≤ 0.109; g = 0.83-1.35). Improvements in cutting performance were moderately to very largely associated ( p ≤ 0.078; r or ρ = 0.469-0.846) with increased velocity profiles, increased propulsive forces over shorter GCTs, and decreased knee flexion. Change of direction speed and technique modification is a simple, effective training method requiring minimal equipment that can enhance COD performance, which practitioners should consider incorporating into their pitch- or court-based training programs.
多斯桑托斯，T、托马斯，C、康福特，P和琼斯，PA。为期6周的变向速度和技术改进干预的生物力学效应：对变向侧步性能的影响。《力量与体能研究杂志》36(10): 2780 - 2791，2022年。本研究的目的是评估变向（COD）速度和技术改进训练对45°（CUT45）和90°（CUT90）侧步切入时COD性能（完成时间、地面接触时间[GCT]和出射速度）的生物力学效应。进行了一项非随机、对照的为期6周的干预研究。15名男性、多方向运动运动员（年龄，23.5±5.2岁；身高，1.80±0.05米；体重，81.6±11.4千克）组成干预组（IG），他们每周参加两次30分钟的COD速度和技术改进课程，而12名男性、多方向运动运动员（年龄，22.2±5.0岁；身高，1.76±0.08米；体重，72.7±12.4千克）组成对照组（CG）并继续他们的正常训练。所有受试者进行了6次CUT45和CUT90任务的试验，通过三维运动和地面反作用力分析评估干预前后下肢和躯干的动力学和运动学变化。双向混合方差分析显示，CUT45完成时间、出射速度和CUT90完成时间在时间（干预前后变化）上有显著主效应（p≤0.045；η² = 0.152 - 0.539），并且在CUT45完成时间、GCT、出射速度和CUT90完成时间上观察到时间和组的显著交互效应（p≤0.010；η² = 0.239 - 0.483），干预组在干预后表现出比对照组更优的性能（p≤0.109；g = 0.83 - 1.35）。切入性能的改善与速度曲线增加、在更短GCT上的推进力增加以及膝关节屈曲减少中度至高度相关（p≤0.078；r或ρ = 0.469 - 0.846）。变向速度和技术改进是一种简单、有效的训练方法，所需设备最少，可以提高COD性能，从业者应考虑将其纳入基于球场或场地的训练计划中。
