Middleton Kane Jytte, Alderson Jacqueline Anne, Elliott Bruce Clifford, Mills Peter Michael
a School of Sport Science, Exercise and Health , The University of Western Australia , Perth , Australia.
J Sports Sci. 2015;33(15):1622-31. doi: 10.1080/02640414.2014.1003586. Epub 2015 Feb 2.
This modelling study sought to describe the relationships between elbow joint kinematics and wrist joint linear velocity in cricket fast bowlers, and to assess the sensitivity of wrist velocity to systematic manipulations of empirical joint kinematic profiles. A 12-camera Vicon motion analysis system operating at 250 Hz recorded the bowling actions of 12 high performance fast bowlers. Empirical elbow joint kinematic data were entered into a cricket bowling specific "Forward Kinematic Model" and then subsequently underwent fixed angle, angular offset and angle amplification manipulations. A combination of 20° flexion and 20° abduction at the elbow was shown to maximise wrist velocity within the experimental limits. An increased elbow flexion offset manipulation elicited an increase in wrist velocity. Amplification of elbow joint flexion-extension angular displacement indicated that, contrary to previous research, elbow extension range of motion and angular velocity at the time of ball release were negatively related to wrist velocity. Some relationships between manipulated joint angular waveforms and wrist velocity were non-linear, supporting the use of a model that accounts for the non-linear relationships between execution and outcome variables in assessing the relationships between elbow joint kinematics and wrist joint velocity in cricket fast bowlers.
这项建模研究旨在描述板球快速投球手肘关节运动学与腕关节线速度之间的关系，并评估腕关节速度对经验性关节运动学轮廓的系统操纵的敏感性。一个以250Hz运行的12台摄像机的Vicon运动分析系统记录了12名高性能快速投球手的投球动作。将经验性肘关节运动学数据输入到一个特定于板球投球的“正向运动学模型”中，然后对其进行固定角度、角度偏移和角度放大操纵。结果显示，在实验范围内，肘关节20°屈曲和20°外展的组合可使腕关节速度最大化。肘关节屈曲偏移增加的操纵会引起腕关节速度增加。肘关节屈伸角位移的放大表明，与先前的研究相反，球释放时肘关节的伸展运动范围和角速度与腕关节速度呈负相关。操纵的关节角波形与腕关节速度之间的一些关系是非线性的，这支持在评估板球快速投球手肘关节运动学与腕关节速度之间的关系时，使用一个考虑执行变量和结果变量之间非线性关系的模型。
