Okamura Shun, Iida Kai
Department of Physical Therapy, Faculty of Health Science Technology Bunkyo Gakuin University.
Int J Sports Phys Ther. 2024 Nov 1;19(11):1447-1454. doi: 10.26603/001c.123954. eCollection 2024.
Trunk rotation during pitching correlates with pitching velocity and load on the joints of the upper limb. Trunk rotation is often focusing on during teaching the pitching motion. Athletes who exhibit early trunk rotation during pitching often have low thoracic spine rotational range of motion. The purpose of this study was to investigate the relationship between the range of thoracic spine rotation measured using the lumbar locked rotation test (LLR-t), hip-shoulder separation (H/S) and thoracic rotation angle at stride foot contact (SFC), and ball velocity.
Descriptive laboratory study.
Fifteen healthy male high school students belonging to a baseball club were recruited for participation. The throwing side and non-throwing side LLR-t was performed using an inclinometer. Hip-shoulder separation and thoracic rotation angle during SFC were measured using a pitching motion analysis application: Pitch AI. In addition, a tracking device specifically designed for pitching：Pitching2.0 was employed to measure ball velocity. Correlations between LLR angle, H/S, trunk rotation angles at SFC, and ball velocity were examined using Pearson's correlation coefficient.
There was a positive correlation（r=0.52，p=0.047） between the LLRt angle and H/S. Additionally, there was a negative correlation（r=-0.62, p =0.01） between the LLRt angle on the throwing side and thoracic rotation angle. There was a positive correlation(r=0.54, p=0.04) between ball velocity and H/S and a negative correlation(r=-0.56, p=0.03) between ball velocity and thoracic rotation angle during SFC. .
The LLR-t measures thoracic rotation angle with the pelvis-lumbar spine fixed. The results indicated that throwing side LLR was related to the thoracic angle during SFC and hip-shoulder separation.
投球过程中的躯干旋转与投球速度以及上肢关节的负荷相关。在教授投球动作时，躯干旋转常常是重点关注的内容。在投球过程中过早出现躯干旋转的运动员，其胸椎旋转活动度往往较低。本研究的目的是调查使用腰椎锁定旋转试验（LLR-t）测量的胸椎旋转范围、髋肩分离（H/S）以及步幅脚着地（SFC）时的胸椎旋转角度与球速之间的关系。
描述性实验室研究。
招募了15名隶属于棒球俱乐部的健康男性高中生参与研究。使用倾角仪测量投掷侧和非投掷侧的LLR-t。使用投球动作分析应用程序Pitch AI测量SFC期间的髋肩分离和胸椎旋转角度。此外，采用专门为投球设计的跟踪设备Pitching2.0测量球速。使用Pearson相关系数检验LLR角度、H/S、SFC时的躯干旋转角度与球速之间的相关性。
LLRt角度与H/S之间存在正相关（r = 0.52，p = 0.047）。此外，投掷侧的LLRt角度与胸椎旋转角度之间存在负相关（r = -0.62，p = 0.01）。球速与H/S之间存在正相关（r = 0.54，p = 0.04），在SFC期间球速与胸椎旋转角度之间存在负相关（r = -0.56，p = 0.03）。
LLR-t在骨盆-腰椎固定的情况下测量胸椎旋转角度。结果表明，投掷侧的LLR与SFC期间的胸椎角度和髋肩分离有关。
3级。
