Faculty of Sports Science, Sendai University.
Faculty of Sports and Health Studies, Hosei University.
Fukushima J Med Sci. 2023 Apr 5;69(1):1-10. doi: 10.5387/fms.2022-14. Epub 2023 Feb 11.
Lower back pain (LBP) is common among baseball players, and the occurrence of lumbar intervertebral disc degeneration is high. The dynamic load on the lumbar spine due to the postures and movements characteristic of baseball is suspected of aggravating LBP caused by degeneration, but the difference in batting action between players with and without degeneration is not known. The purpose of this study was to investigate the difference in batting motion in the presence and absence of lumbar disc degeneration (LDD). The subjects were 18 male baseball players belonging to the University League Division I: seven with disc degeneration and 11 without. The motion task analyzed tee batting. The items examined were the angles of rotation of shoulder, pelvis, hip, and twisting motion; rotation angular velocity; time to maximum angular velocity; and muscle activity potentials of the bilateral latissimus dorsi, erector spinae, multifidus, external oblique, internal oblique, rectus abdominis, and gluteus medius muscles; at each stage of batting action. There were significant differences between the shoulder and pelvis in rotation angle, time to maximum angular velocity, and muscle activity in the presence and absence of LDD, and in the time to maximum angular velocity between the shoulder and pelvis. We infer that these differences are characteristic of batting motion due to LDD.
下背痛（LBP）在棒球运动员中很常见，腰椎间盘退变的发生率很高。由于棒球特有的姿势和动作对腰椎的动态负荷，怀疑会加重退变引起的 LBP，但退变患者和无退变患者的击球动作差异尚不清楚。本研究旨在探讨腰椎间盘退变（LDD）存在和不存在时的击球动作差异。研究对象为 18 名属于大学联盟一级的男性棒球运动员：7 名椎间盘退变和 11 名无退变。分析的运动任务是打 T 字球。检查的项目包括肩部、骨盆、臀部的旋转角度、扭转运动；旋转角速度；达到最大角速度的时间；以及双侧背阔肌、竖脊肌、多裂肌、腹外斜肌、腹内斜肌、腹直肌和臀中肌的肌肉活动电位；在击球动作的每个阶段。LDD 存在和不存在时，肩部和骨盆的旋转角度、达到最大角速度的时间和肌肉活动以及肩部和骨盆之间的达到最大角速度的时间存在显著差异。我们推断这些差异是由于 LDD 导致击球动作的特征。
