Research Institute for Sport and Exercise Sciences, Faculty of Science, Liverpool John Moores University, Liverpool, UK; School of Sport and Biological Sciences, University of Bolton, Bolton, UK.
Research Institute for Sport and Exercise Sciences, Faculty of Science, Liverpool John Moores University, Liverpool, UK.
J Biomech. 2020 May 7;104:109711. doi: 10.1016/j.jbiomech.2020.109711. Epub 2020 Feb 29.
Control of the centre of mass (CoM) whilst minimising the use of unnecessary movements is imperative for successful performance of dynamic sports tasks, and may indicate the condition of whole-body dynamic stability. The aims of this study were to express movement strategies that represent whole-body dynamic stability, and to explore their association with potentially injurious joint mechanics and side cutting performance. Twenty recreational soccer players completed 45° unanticipated side cutting. Five distinct whole-body dynamic stability movement strategies were identified, based on factors that influence the medial ground reaction force (GRF) vector during ground contact in the side cutting manoeuvre. Using Statistical Parametric Mapping, the movement strategies were linearly regressed against selected performance outcomes and peak knee abduction moment (peak KAM). Significant relationships were found between each movement strategy and at least one selected performance outcome or peak KAM. Our results suggest excessive medial GRFs were generated through sagittal plane movement strategies, and despite being beneficial for performance aspects, poor sagittal plane efficiency may destabilise control of the CoM. Frontal plane hip acceleration is the key non-sagittal plane movement strategy used in a corrective capacity to moderate excessive medial forces. However, whilst this movement strategy offered a way to retrieve control of the CoM, mitigating reduced whole-body dynamic stability, it also coincided with increased peak KAM. Overall, whole-body dynamic stability movement strategies helped explain the delicate interplay between the mechanics of changing direction and undesirable joint moments, providing insights that might support development of future intervention strategies.
控制质心（CoM）并最小化不必要的运动对于成功完成动态运动任务至关重要，并且可能表明整个身体动态稳定性的状况。本研究的目的是表达代表整个身体动态稳定性的运动策略，并探讨它们与潜在的关节力学损伤和侧切性能的关系。二十名休闲足球运动员完成了 45°意外侧切。基于影响侧切动作中地面接触时内侧地面反作用力（GRF）矢量的因素，确定了五种不同的整体动态稳定性运动策略。使用统计参数映射，将运动策略与选定的性能结果和峰值膝外展力矩（peak KAM）进行线性回归。发现每个运动策略与至少一个选定的性能结果或峰值 KAM 之间存在显著关系。我们的结果表明，过度的内侧 GRF 是通过矢状面运动策略产生的，尽管对性能方面有益，但矢状面效率低下可能会破坏 CoM 的控制稳定性。额状面髋关节加速度是在纠正能力中用于调节过度内侧力的关键非矢状面运动策略。然而，虽然这种运动策略为恢复 CoM 的控制提供了一种方法，但减轻了整个身体动态稳定性的降低，同时也伴随着峰值 KAM 的增加。总体而言，整个身体动态稳定性运动策略有助于解释改变方向的力学和不理想的关节力矩之间的微妙相互作用，提供的见解可能支持未来干预策略的发展。
