Castonguay Tristan, Roberts Mary, Dover Geoff
Department of Health, Kinesiology and Applied Physiology, Concordia University, Montreal, QC,Canada.
PERFORM Centre, Researcher, CRIR-Centre de Réadaptation Constance-Lethbridge du CIUSSS COMLT, Concordia University, Montreal, QC,Canada.
J Sport Rehabil. 2022 Jul 12;32(1):1-8. doi: 10.1123/jsr.2021-0351. Print 2023 Jan 1.
While most baseball players' warm-up with a weighted bat/donut, there is evidence to suggest the swing speed decreases after the warm-up even though the bat feels lighter. Warming up with a dynamic moment of inertia bat may not decrease the swing speed and therefore improve the performance of baseball players. The hypothesis is that a dynamic moment of inertia bat will negate the effect of the kinesthetic illusion observed with a weighted bat.
To measure the difference in bat swing speed between warming up with the dynamic moment of inertia bat compared with a weighted bat.
Thirty-nine competitive baseball players participated in the study. All players were randomly assigned a warm-up tool that could be either a dynamic moment of inertia bat or a weighted bat. After the players' warm-up, they swung their normal bat, and the bat swing speed was measured using a high-speed camera. We used motion analysis software to calculate the swing speed which measured the linear displacement during the last 15 frames before ball contact. The process was then repeated so that each player had the chance to try both warm-up bats.
The post warm-up swing speeds using the dynamic moment of inertia bat were significantly faster compared with a weighted bat warm-up. There was a 0.56 (0.78) m/s (1.26 [1.74] mph) increase in swing speed when using the dynamic moment of inertia bat (P = .0001), which is an average increase of 2.10% compared with a weighted bat warm-up.
Our findings suggest that using a dynamic moment of inertia bat before an at-bat can increase swing speed compared with a weighted warm-up. Future studies are needed to determine if using a dynamic moment of inertia bat as part of rehabilitation can facilitate returning to competition after injury by focusing on swing speed.
虽然大多数棒球运动员会使用加重球棒/甜甜圈进行热身，但有证据表明，热身之后挥棒速度会下降，即便球棒感觉变轻了。使用转动惯量动态变化的球棒进行热身可能不会降低挥棒速度，从而提高棒球运动员的表现。假设是转动惯量动态变化的球棒将消除使用加重球棒时观察到的运动错觉的影响。
测量使用转动惯量动态变化的球棒热身与使用加重球棒热身时球棒挥棒速度的差异。
39名竞技棒球运动员参与了该研究。所有运动员被随机分配一种热身工具，该工具可以是转动惯量动态变化的球棒或加重球棒。运动员热身之后，挥动他们常用的球棒，使用高速摄像机测量球棒挥棒速度。我们使用运动分析软件计算挥棒速度，该软件测量了球棒接触球之前最后15帧的线性位移。然后重复该过程，以便每个运动员都有机会尝试两种热身球棒。
与使用加重球棒热身相比，使用转动惯量动态变化的球棒热身之后的挥棒速度明显更快。使用转动惯量动态变化的球棒时，挥棒速度增加了0.56（0.78）米/秒（1.26 [1.74]英里/小时）（P = .0001），与使用加重球棒热身相比平均增加了2.10%。
我们的研究结果表明，与使用加重球棒热身相比，击球前使用转动惯量动态变化的球棒可以提高挥棒速度。未来需要进行研究，以确定使用转动惯量动态变化的球棒作为康复的一部分是否可以通过关注挥棒速度来促进受伤后重返比赛。
