Considering appropriate Throwing load index for prevent injuries for junior high school baseball players.

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K19494
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 59020:Sports sciences-related
• Research Institution: Juntendo University
• Principal Investigator: Nakamura Emi 順天堂大学, 保健医療学部, 助教 (10780223)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 投球障害 / 中学野球 / 成長期

Outline of Final Research Achievements

we investigated that the load on the shoulder and elbow during throwing in juniour high school baseball players was examined based on the difference in the ball used.The results showed that the average ball speed of hard-baseball players was significantly faster than that of soft-baseball players, and the maximum valgus torque applied to the medial elbow was also significantly higher.In addition, we examined gender differences, it was confirmed that male players had a significantly faster ball speed than female players, but there was no difference between the average maximum valgus torque applied to the medial elbow during pitching.Furthermore, an investigation into the relationship with pitching load was conducted on players who were able to be followed up for one year, and it was found that players who had newly developed shoulder or elbow pain within the year (symptomatic group) had significantly faster arm speed during pitching compared to the asymptomatic group.

Free Research Field

スポーツ理学療法学

Academic Significance and Societal Importance of the Research Achievements

成長期の野球選手の連投や投球過多が問題しされており，障害予防の観点から現在は球数制限やイニング制限などが多くの大会にて導入されている．本研究では，発育発達のスパート期にある中学野球選手を対象に，投球時の負荷量を明らかにし，繰り返しの投球動作にともなう障害発生との関連を明らかにし，新たな障害発生の予防に繋げることを目的としておこなった．結果，中学期では使用球の違いにより，投球時の肘内側へ加わる負荷が異なることが明らかとなり硬式球使用選手の方が，繰り返しの投球負荷量により留意する必要があることが明らかとなった．