握力与重复性投球引起的内侧肘关节间隙增宽无关。
Grip strength is not related to increased medial elbow joint-space gapping induced by repetitive pitching.
作者信息
Hattori Hiroshi, Akasaka Kiyokazu, Otsudo Takahiro, Hall Toby
机构信息
Graduate School of Medicine, Saitama Medical University, Moroyama, Saitama, Japan.
Department of Rehabilitation, Kawagoe Clinic, Saitama Medical University, Kawagoe, Saitama, Japan.
出版信息
JSES Int. 2020 Aug 1;4(4):1026-1030. doi: 10.1016/j.jseint.2020.07.007. eCollection 2020 Dec.
BACKGROUND
Pitching induces elbow valgus stress, which can lead to an increase in medial elbow joint-space gapping when repeated. Previous basic research on the medial elbow joint shows that the contraction associated with gripping reduces medial elbow joint-space gapping. However, no studies have investigated the relationship between grip strength and increased medial elbow joint-space gapping during repetitive pitching. The purpose of this study was to investigate whether grip strength is related to medial elbow joint-space gapping during repetitive pitching. Our hypothesis was that increased grip strength would correlate with a reduction in medial elbow joint-space gapping.
METHODS
A total of 25 high school baseball players participated in this study. Each subject pitched 100 times. The medial elbow joint-space gapping and grip strength were measured before and after pitching. Correlation analysis was used to identify the relationship between medial elbow joint-space gapping and grip strength.
RESULTS
Medial elbow joint-space gapping (mm) increased by 25.5% ± 8.0% after 100 pitches (gapping before, 5.0 ± 0.9; gapping after, 6.2 ± 1.1; < .001). Grip strength (kg) after 100 pitches decreased by 2.8% ± 7.4% to that before pitching (before, 40.4 ± 5.5; after 39.2 ± 5.6; < .05). There was no significant correlation between the change rate of medial elbow joint gapping and grip strength at any time (grip strength: before pitching, = .74; after pitching, = .40; change rate from before to after pitching, = .24).
CONCLUSIONS
Grip strength is not related to increased medial elbow joint-space gapping induced by repetitive pitching. This indicates that physical ability expressed by grip strength is not associated with preventing increases in medial elbow joint-space gapping during repetitive pitching. Further studies are required to investigate the stabilization mechanism of the medial elbow joint during pitching.
背景
投球会产生肘部外翻应力，反复投球会导致内侧肘关节间隙增大。先前关于内侧肘关节的基础研究表明，与抓握相关的收缩会减少内侧肘关节间隙。然而，尚无研究探讨重复投球过程中握力与内侧肘关节间隙增大之间的关系。本研究的目的是调查重复投球过程中握力是否与内侧肘关节间隙有关。我们的假设是，握力增加将与内侧肘关节间隙减小相关。
方法
共有25名高中棒球运动员参与本研究。每位受试者投球100次。在投球前后测量内侧肘关节间隙和握力。采用相关性分析确定内侧肘关节间隙与握力之间的关系。
结果
100次投球后内侧肘关节间隙（mm）增加了25.5%±8.0%（投球前间隙为5.0±0.9；投球后间隙为6.2±1.1；<.001）。100次投球后的握力（kg）比投球前下降了2.8%±7.4%（投球前为40.4±5.5；投球后为39.2±5.6；<.05）。内侧肘关节间隙变化率与握力在任何时候均无显著相关性（握力：投球前，=.74；投球后，=.40；投球前后变化率，=.24）。
结论
握力与重复投球引起的内侧肘关节间隙增大无关。这表明握力所体现的身体能力与防止重复投球过程中内侧肘关节间隙增大无关。需要进一步研究来探讨投球过程中内侧肘关节的稳定机制。
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