Posterior shoulder capsule of the dominant arm is stiffer in baseball players than that in non-throwing population
Posterior shoulder capsule of the dominant arm is stiffer in baseball players than that in non-throwing population
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棒球运动员的优势臂后肩关节囊比非投掷人群更僵硬
DOI：
10.1016/j.jse.2022.01.119
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发表时间：
2022
影响因子：
3
通讯作者：
Masaki Katayose
中科院分区：
文献类型：
--
作者：
Naoya Iida;Keigo Taniguchi;Shogo Soma;Kazuya Saizaki;Hajime Toda;Kota Watanabe;Masaki Katayose
肩关节后囊膜过紧是高空运动员肩关节损伤的重要因素之一。最近的研究表明，在棒球运动员中，优势臂的后囊膜比非优势臂的后囊膜更硬。然而，优势臂的后囊膜紧缩是否仅限于过头顶运动员仍不清楚。本研究旨在探讨是否在棒球运动员的优势臂肩关节后囊膜僵硬比nonthrowing population.Methods15名男大学生无症状的棒球运动员（棒球运动员组）和15名男大学生谁没有参加过头顶运动（nonthrowing组）参加了这项研究。我们通过超声剪切波弹性成像测量了优势臂中、下后囊、上级冈下肌、下冈下肌、小圆肌和后三角肌的剪切模量。我们使用独立样本t检验和Mann-Whitney检验比较两组之间的剪切模量。此外，我们还利用Pearson相关系数分析了各组盂肱关节内旋范围与各剪切模量之间的相关性。结果棒球运动员组的剪切模量显著高于非投掷组，无论是在中后囊还是在后囊（棒球运动员组：36.1 ± 5.6 kPa vs.非投掷组：29.0 ± 8.6 kPa;P= 0.018）和下后囊（37.1 ± 9.6 kPa vs. 27.9 ± 6.8 kPa;P= 0.002）。然而，没有差异的剪切模量的个别肌肉群被确定。在棒球运动员组中，盂肱关节内旋范围与下后囊的剪切模量呈显著负相关（Pearson相关系数=-0.586，P =.022.ConclusionOur研究结果表明，棒球运动员的优势臂肩关节后囊比非投掷人群更硬。
BackgroundPosterior shoulder capsule tightness is one of the factors for shoulder injuries in overhead athletes. Recent studies have shown the posterior capsule of the dominant arm to be stiffer than that of the nondominant arm in baseball players. However, whether posterior capsule tightness in the dominant arm is exclusive to overhead athletes remains unknown. This study aimed to investigate whether the posterior shoulder capsule of the dominant arm in baseball players is stiffer than that in nonthrowing population.MethodsFifteen male collegiate asymptomatic baseball players (baseball-player group) and fifteen male college students who did not partake in overhead sports (nonthrowing group) participated in this study. We measured the shear moduli of the middle and inferior posterior capsules, superior infraspinatus, inferior infraspinatus, teres minor, and posterior deltoid in the dominant arm by ultrasound shear wave elastography. We compared shear moduli between the two groups using an independent samples t-test and Mann–Whitney test. In addition, we investigated the correlation between the range of glenohumeral internal rotation and each shear modulus in each group using the Pearson correlation coefficient.ResultsThe shear moduli in the baseball-player group were significantly higher than those in the nonthrowing group in both the middle posterior capsule (baseball-player group: 36.1 ± 5.6 kPa vs. nonthrowing group: 29.0 ± 8.6 kPa;P= .018) and inferior posterior capsule (37.1 ± 9.6 kPa vs. 27.9 ± 6.8 kPa;P= .002). However,no difference in the shear moduli of individual muscle groups was identified. The glenohumeral internal rotation range exhibited a statistically significant negative correlation with the shear modulus of the inferior posterior capsule in the baseball-player group (Pearson correlation coefficient = −0.586,P= .022).ConclusionOur findings suggest that the posterior shoulder capsule of the dominant arm in baseball players is stiffer than that in nonthrowing population.