Human Performance Lab, University of Calgary, Calgary, Alberta, Canada.
Sports Biomech. 2012 Jun;11(2):239-48. doi: 10.1080/14763141.2012.674154.
The role of shaft stiffness on the golf swing is not well understood. Studies in which golfers hit balls with clubs of varying shaft flex have reported changes in ball distance. The results of mathematical models suggest that shaft stiffness affects only the orientation of the clubhead at impact, not the speed of the clubhead, but there are no experimental results validating these findings. The purpose of this study was therefore to experimentally examine the influence of shaft stiffness on clubhead kinematics at ball impact. Forty golfers hit 10 balls with each of five drivers varying in shaft stiffness from 'Ladies' to 'Extra-Stiff', in a double-blind study design. The motions of three reflective markers attached to the clubhead were captured with a high-speed motion analysis system. At ball impact, shaft stiffness had a statistically significant influence on clubhead speed for 27 subjects, on loft angle for 11 subjects, and on lie angle for all 40 subjects. No effect was observed on face angle, in to out path angle, or attack angle. These results show that shaft stiffness can affect ball launch conditions by altering clubhead speed and/or loft angle.
杆身硬度对高尔夫挥杆的影响尚未得到很好的理解。研究人员让高尔夫球手使用不同硬度的球杆击球，结果发现球的飞行距离有所变化。数学模型的结果表明，杆身硬度仅影响撞击时杆头的方向，而不影响杆头的速度，但没有实验结果验证这些发现。因此，本研究旨在通过实验检验杆身硬度对击球时杆头运动学的影响。在一项双盲研究设计中，40 名高尔夫球手用五种不同硬度（从“女士”到“超强”）的发球杆各打了 10 个球。通过高速运动分析系统捕捉到附在杆头上的三个反光标记的运动。在击球时，27 名受试者中有 27 名受试者的杆头速度、11 名受试者的仰角和 40 名受试者的杆面角受到杆身硬度的显著影响。而杆面角、由内向外的路径角和攻角则不受影响。这些结果表明，杆身硬度可以通过改变杆头速度和/或仰角来影响球的起飞条件。
