Southard Dan, Groomer Levi
Department of Kinesiology, Texas Christian University, Fort Worth 76129, USA.
Res Q Exerc Sport. 2003 Sep;74(3):270-6. doi: 10.1080/02701367.2003.10609091.
The purpose of this study was to determine if warm-up with baseball bats of different moments of inertia has an effect on swing pattern and bat velocity. Ten experienced baseball players (ages 20-25 years) voluntarily participated in this study. Each participant was required to complete 10 dry swings (5 warm-up and 5 postwarm-up) at maximum effort within 3 different conditions. Post warm-up was always with a standard bat (I = .27 kgm2; 83.8 cm, 9.1 N). Warm-up for Condition 1 was with the standard bat. Condition 2 required participants to warm up with a standard bat plus a 6.1 N lead donut (I = .49 kgm2, 83.8 cm, 15.6 N). Condition 3 required participants to warm up with a hollow plastic bat (I = .08 kgm2; 83.8 cm, 3.34 N). Quantitative and qualitative analyses indicated that following warm-up with the weighted bat (largest moment of inertia), swing pattern was significantly altered, and post warm-up velocity was the lowest of the three conditions.
本研究的目的是确定使用不同转动惯量的棒球棒进行热身是否会对挥棒模式和球棒速度产生影响。十名经验丰富的棒球运动员（年龄在20至25岁之间）自愿参与了本研究。每位参与者需要在3种不同条件下以最大努力完成10次空挥（5次热身和5次热身之后）。热身之后总是使用标准球棒（I = 0.27千克·平方米；83.8厘米，9.1牛）。条件1的热身使用标准球棒。条件2要求参与者使用标准球棒加一个6.1牛的铅制甜甜圈（I = 0.49千克·平方米，83.8厘米，15.6牛）进行热身。条件3要求参与者使用空心塑料球棒（I = 0.08千克·平方米；83.8厘米，3.34牛）进行热身。定量和定性分析表明，在使用加重球棒（最大转动惯量）进行热身之后，挥棒模式发生了显著变化，并且热身之后的速度是三种条件中最低的。
