Oshikawa Tomoki, Morimoto Yasuhiro, Kaneoka Koji
Graduate School of Sport Sciences, Waseda University.
Faculty of Sport Sciences, Waseda University.
J Med Invest. 2018;65(1.2):56-59. doi: 10.2152/jmi.65.56.
Low back pain (LBP) often occurs in baseball players;however, the characteristics of the location of their LBP with respect to their throwing and hitting sides have not been clarified. In order to clarify the left-right asymmetry of LBP that occurs in baseball players, we surveyed 247 university baseball players using an LBP questionnaire. The main investigational items were:throwing and hitting side, position at the time of LBP experience, and LBP location. Based upon the indication of their throwing and hitting side, subjects were classified into unilateral rotational (UR) or bilateral rotational (BR) types. Subjects were also classified into categories of LBP location as described by ipsilateral or contralateral to dominant side of throwing or hitting. Chi-square test or Fisher exact test were used to compare LBP location side by rotational type (UR/BR) in all subjects and by position (pitcher/fielder). We found that among fielders, LBP occurring contralateral to the hitting side in UR was significantly more frequent than that in BR. We conclude that LBP occurred in baseball fielders with a left-right asymmetry, which suggests that high frequency unilateral rotation causes the lumbar region contralateral to the dominant hitting side to be subject to a high load. J. Med. Invest. 65:56-59, February, 2018.
下背痛（LBP）在棒球运动员中经常出现；然而，他们下背痛的位置相对于投球侧和击球侧的特征尚未明确。为了阐明棒球运动员中出现的下背痛的左右不对称性，我们使用下背痛问卷对247名大学棒球运动员进行了调查。主要调查项目包括：投球侧和击球侧、下背痛发作时的位置以及下背痛的位置。根据他们投球侧和击球侧的指示，受试者被分为单侧旋转（UR）或双侧旋转（BR）类型。受试者还根据与投球或击球优势侧同侧或对侧所描述的下背痛位置进行分类。使用卡方检验或Fisher精确检验来比较所有受试者中按旋转类型（UR/BR）以及按位置（投手/外野手）划分的下背痛位置侧。我们发现，在外野手中，UR类型中与击球侧对侧发生的下背痛明显比BR类型中更频繁。我们得出结论，棒球外野手中出现的下背痛存在左右不对称性,这表明高频单侧旋转会使优势击球侧对侧的腰椎区域承受高负荷。《医学调查杂志》65:56 - 59，2018年2月。
