This study aimed to examine the effects of change of direction (COD) speed and technique modification training on 180° turning performance (completion time, ground contact time [GCT], and exit velocity), kinetics, and kinematics. A non-randomised 6 week intervention study was administered. Thirteen male multidirectional sport athletes formed the intervention group (IG), participating in two COD speed and technique modification sessions per week. A total of 12 male multidirectional sport athletes formed the control group (CG). All subjects performed six modified 505 trials, whereby pre-to-post-intervention biomechanical changes were evaluated using three-dimensional motion analysis. Two-way mixed analysis of variances revealed significant interaction effects (group × time) for completion time, mean horizontal propulsive force (HPF), horizontal to vertical mean braking and propulsive force ratios for the penultimate (PFC) and final foot contact (FFC), FFC peak knee flexion and PFC hip flexion angle (p ≤ 0.040, η² = 0.170–0.417). The IG displayed small to large improvements post-intervention in these aforementioned variables (p ≤ 0.058, g = 0.49–1.21). Turning performance improvements were largely to very largely (p ≤ 0.062, r or ρ = 0.527–0.851) associated with increased mean HPF, more horizontally orientated FFC propulsive force and PFC braking force, and greater pelvic rotation, PFC hip flexion, and PFC velocity reductions. COD speed and technique modification is a simple, effective training strategy that enhances turning performance.

中文翻译：

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改变方向速度和技术修改训练可改善180°转弯性能，动力学和运动学

这项研究旨在检验方向改变（COD）速度和技术修改训练对180°转弯性能（完成时间，地面接触时间[GCT]和出口速度），动力学和运动学的影响。进行了一项为期6周的非随机干预研究。13名男性多方向运动运动员组成干预小组（IG），每周参加两次COD速度和技术修改会议。总共12名男性多方向运动运动员组成了对照组（CG）。所有受试者进行了六项修改后的505试验，从而使用三维运动分析评估了干预前后的生物力学变化。差异的双向混合分析显示，完成时间，平均水平推进力（HPF），p ≤0.040，η ² = 0.170-0.417）。所述IG显示小到在上述这些变量大的改进后干预（p ≤0.058，克= 0.49-1.21）。转弯性能的改进在很大程度上以很大程度上（p ≤0.062，[R或ρ=具有增加的平均HPF，更水平定向FFC推进力和PFC制动力，和更大的骨盆的旋转，PFC髋关节屈曲，和PFC速度相关联0.527-0.851）减少。COD速度和技术修改是一种简单有效的训练策略，可提高转弯性能。