Beach Aaron J, Ferdinands René E D, Sinclair Peter J
a Exercise and Sport Science, Faculty of Health Sciences , University of Sydney , Sydney , Australia.
J Sports Sci. 2018 May;36(10):1127-1134. doi: 10.1080/02640414.2017.1358460. Epub 2017 Jul 27.
The techniques of spin bowling in cricket have been largely formulated from the collective intuitions of past players. A standard model of bowling technique has been generally prescribed for both off-spin and leg-spin bowlers, but there has been no biomechanics research to validate this approach. This study measured 20 Type-2 off-spin and 15 Type-2 leg-spin bowlers using a 3D Cortex motion analysis system. Correlation coefficients between segmental kinematic variables and spin rate in the off-spin and leg-spin bowlers revealed that off-spin bowling was associated with an earlier movement time of the thorax, whereas leg-spin bowling was associated with a greater magnitude and earlier movement time of pelvis rotation, as well as a greater magnitude of pelvis-shoulder separation movement. The maximum velocity of rear hip flexion differentiated between both groups of bowlers. The GLM suggested that for off-spinners, rear hip flexion velocity significantly explained the variance in spin rate (subject to sequential timing constraints), while for leg-spinners, the time of maximum rear hip flexion and maximum arm circumduction velocity significantly explained variance in spin rate. This study supports the notion that off-spinners and leg-spinners have significant differences in their joint kinematics, and should not be coached under a one-size-fits-all technical model.
板球运动中的旋转投球技巧很大程度上是由过去球员的集体直觉形成的。对于右臂旋转投球手和左臂旋转投球手，通常都规定了一种标准的投球技术模型，但尚未有生物力学研究来验证这种方法。本研究使用3D Cortex运动分析系统对20名二级右臂旋转投球手和15名二级左臂旋转投球手进行了测量。右臂旋转投球手和左臂旋转投球手中节段运动学变量与旋转速度之间的相关系数表明，右臂旋转投球与胸部更早的运动时间相关，而左臂旋转投球与骨盆旋转的更大幅度和更早运动时间以及骨盆-肩部分离运动的更大幅度相关。两组投球手中后髋部屈曲的最大速度有所不同。广义线性模型表明，对于右臂旋转投球手，后髋部屈曲速度显著解释了旋转速度的方差（受顺序时间限制），而对于左臂旋转投球手，后髋部屈曲最大值时间和最大手臂环绕速度显著解释了旋转速度的方差。本研究支持这样一种观点，即右臂旋转投球手和左臂旋转投球手在关节运动学方面存在显著差异，不应在一刀切的技术模型下进行指导。
