Diffendaffer Alek Z, Fleisig Glenn S, Ivey Brett, Aune Kyle T
a American Sports Medicine Institute , Birmingham , AL , USA.
Sports Biomech. 2019 Aug;18(4):448-455. doi: 10.1080/14763141.2018.1429489. Epub 2018 Mar 21.
While 10% of the general population is left-handed, 27% of professional baseball pitchers are left-handed. Biomechanical differences between left- and right-handed college pitchers have been previously reported, but these differences have yet to be examined at the professional level. Therefore, the purpose of this study was to compare pitching biomechanics between left- and right-handed professional pitchers. It was hypothesised that there would be significant kinematic and kinetic differences between these two groups. Pitching biomechanics were collected on 96 left-handed pitchers and a group of 96 right-handed pitchers matched for age, height, mass and ball velocity. Student -tests were used to identify kinematic and kinetic differences ( < 0.05). Of the 31 variables tested, only four were found to be significantly different between the groups. Landing position of the stride foot, trunk separation at foot contact, maximum shoulder external rotation and trunk forward tilt at ball release were all significantly greater in right-handed pitchers. The magnitude of the statistical differences found were small and not consistent with differences in the two previous, smaller studies. Thus, the differences found may be of minimal practical significance and mechanics can be taught the same to all pitchers, regardless of throwing hand.
虽然普通人群中10%是左撇子，但职业棒球投手中27%是左撇子。此前已有关于左、右利手大学投手生物力学差异的报道，但这些差异尚未在职业水平上进行研究。因此，本研究的目的是比较左、右利手职业投手的投球生物力学。研究假设这两组之间在运动学和动力学上存在显著差异。收集了96名左利手投手和一组年龄、身高、体重及投球速度相匹配的96名右利手投手的投球生物力学数据。使用学生t检验来确定运动学和动力学差异（P<0.05）。在测试的31个变量中，两组之间仅发现4个变量存在显著差异。右利手投手的跨步脚落地位置、脚触地时的躯干分离、最大肩部外旋以及球出手时的躯干前倾均显著更大。所发现的统计差异幅度较小，与之前两项规模较小的研究中的差异不一致。因此，所发现的差异可能在实际中意义不大，无论投球手是哪只手，投球力学都可以以相同的方式教授。
