棒球的研究中指出，快速球、曲球、變速球與滑球之間的動作有許多的差異存在，而且各種球路的球速落差蠻大。本研究的目的，即在探討女子壘球使用下肩投法，投出之快速球、下墜球和上飄球是否也有所差異？本研究是利用Peak Performance 3D動作分析系統與SPSS電腦統計軟體，針對女子壘球投手投擲快速球、下墜球與上飄球三種球路作運動學特徵的分析比較。本研究對象五名平均年齡22歲，平均身高169公分，平均體重65公斤。本研究的將動作過程分成傳輸期與加速期兩個階段來進行研究。本研究得到結論如下：
投快速球與投下墜球的動作有下列不同：一、球出手時的重心垂直速度。二、跨步腳著地時的軀幹角度。投快速球與投上飄球的動作有下列不同：一、球出手時的重心垂直速度。二、球出手時的軀幹側傾角度。投下墜球與投上飄球的動作差異較多，分別為：一、球出手時的重心垂直高度。二、球出手時的軀幹側傾角度。三、球出手時的軀幹角度。四、加速期的軀幹角位移。三種球路較大的差異在於軀幹的動作。棒球投手投擲快速球與曲球的動作中，以前臂的肢段貢獻最大，在本研究女子壘球投手的投擲動作，則以前臂與手的貢獻最大。

The study of the pitching baseball indicated that there were kinematic differences among the fastball, curveball, change-up and slider. The purpose of this study was to analyze the kinematic differences among the fastball, drop and rise of the female softball pitchers. The Peak Motus system was used to digitize and analyze the data. Five elite female pitchers served as the subject for this study. Their mean age, height and weight are 22years, 169cm, 65kg respectively. The pitching motion was divided into translation and acceleration phase. The selected variables were tested by using the ANOVA program of SPSS. The results are following:
There were significant differences on the vertical velocity of CG at ball release and the trunk tilt at foot contact between the fastball and drop. There were significant differences on the vertical velocity of CG at ball release and lateral trunk tilt at ball release between fastball and rise. In addition, there were significant differences between drop and rise on the height of CG at ball release, lateral trunk tilt at ball release, trunk tilt at ball release, and trunk displacement at acceleration phase. The study also found that the forearm and hand contributed the greatest percentages of the ball release velocity during the softball pitching.

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