Department of Kinesiology, Health, and Nutrition, University of Texas at San Antonio, San Antonio, Texas.
Baseball Performance Science, Tampa Bay Rays.
J Strength Cond Res. 2018 May;32(5):1324-1328. doi: 10.1519/JSC.0000000000001980.
Oyama, S and Myers, JB. The relationship between the push off ground reaction force and ball speed in high school baseball pitchers. J Strength Cond Res 32(5): 1324-1328, 2018-Baseball pitching is a sequential movement that requires transfer of momentum from the lower extremity to the throwing arm. Therefore, the ground reaction force (GRF) during push off is suggested to play a role in production of ball speed. The purpose of this study was to investigate the correlation between GRF characteristics during push off and ball speed in high school baseball pitchers. A total of 52 pitchers performed fast pitches from an indoor pitching mound. A force plate embedded in an indoor mound was used to capture the push off GRF. The GRF characteristics (peak anterior, vertical, and resultant forces, vertical and resultant forces at the time of peak anterior GRF, and impulse produced by the anterior GRF) from the 3 fastest strike pitches from each pitcher were used for analyses. Spearman's rank correlation coefficients were used to describe the relationships between ball speed and the GRF characteristics. Ball speed was only weakly correlated with peak resultant force (ρ = 0.32, p = 0.02) and vertical (ρ = 0.45, p < 0.001) and resultant (ρ = 0.42, p = 0.002) forces at the time of peak anterior force. The ball speed was not correlated with other variables. The correlation between ball speed and push off force in high school pitchers was weak, especially when compared with what was reported for adult pitchers in other studies. Unlike for adult pitchers, higher push off force is only weakly correlated with ball velocity in high school pitchers, which suggests that training to better use body momentum may help high school pitchers improve ball speed.
大山和迈尔斯。高中棒球投手离地步反作用力与球速的关系。J 强与康 Res 32(5):1324-1328,2018-棒球投球是一个连续的动作，需要从下肢到投掷臂传递动量。因此，离地步反作用力（GRF）在推动时被认为在球速的产生中起作用。本研究的目的是探讨高中棒球投手离地步反作用力特征与球速的相关性。共有 52 名投手从室内投球土墩上投出快球。一个嵌入室内土墩的测力板用于捕捉离地步反作用力。从每个投手的 3 个最快的打击球中，使用 GRF 的特征（前向、垂直和合成力的峰值，前向 GRF 时的垂直和合成力，以及前向 GRF 产生的冲量）进行分析。Spearman 等级相关系数用于描述球速与 GRF 特征之间的关系。球速仅与峰值合成力（ρ=0.32，p=0.02）和垂直力（ρ=0.45，p<0.001）以及前向力峰值时的垂直和合成力（ρ=0.42，p=0.002）有弱相关。球速与其他变量无关。与其他研究中报道的成年投手相比，高中投手的球速与离地步反作用力的相关性较弱。与成年投手不同，高离地步反作用力仅与高中投手的球速有弱相关，这表明更好地利用身体动量的训练可能有助于高中投手提高球速。
