本研究的目的在探討壘球選手下肢膝關節等速肌力之最大力矩及肌群比值。以高中女子壘球選手16名為施測對象，平均年齡16.81±0.83歲，身高162.06±6.72公分，體重59±8.41公斤，球齡4.44±1.03。下肢膝關節等速肌力測驗部分利用Biodex System 3 Quickset等速測力儀測量慣用腳及非慣用腳之最大力矩，進行60°/s 、180°/s 及300°/s三種角速度測驗，每種角速度皆反覆五次。測驗結果以重複量數二因子變異數分析各參數差異之顯著性，顯著水準定為α=.05。結果發現，無論慣用腳或非慣用腳之膝關節最大力矩，在不同角速度下，伸展肌群均顯著大於屈曲肌群（p < .05），且最大力矩值與伸屈肌差值隨角速度增加而降低。在肌力比值部分，慣用腳與非慣用腳之屈伸肌比值隨角速度增加而提升；慣用腳與非慣用腳之對稱肌群肌力比值差異為1-7 %。結果顯示，慣用腳及非慣用腳各角速度之F/E ratio均符合文獻所提之平衡範圍，左右對稱肌群之E/E ratio和F/F ratio差異皆低於10 %，顯示本研究中之女子壘球選手肌力均達到良好的平衡狀態。

The purpose of this study was to compare isokinetics knee peak torque (PT), flexor/extensor ratios (F/E ratios), and strength differences between dominant/non-dominant leg (extensor/extensor ratios, E/E ratios and flexor/flexor ratios, F/F ratios) in high school softball players. Sixteen youth softball players participated in this study, with average ages: 16.81±0.83 years, heights: 162.06±6.72 cm and weights: 59±8.41 kg, training age: 4.44±1.03 years. Biodex System 3 Quickset was used to measure the isokinetics knee PT. All subjects performed five maximal knee extension and flexion efforts at 60˚/s, 180˚/s and 300˚/s of both leg under concentric conditions. Two-way ANOVA repeated measure statistical procedures were applied on test of difference of the PT, F/E ratios. The significance level was set at α=.05. Results: The peak torque (PT) of knee extensor muscle groups at different velocities was significantly higher than flexor muscle groups (p < .05), and the PT value decreased with increase in velocities. The flexor/extensor ratios (F/E ratios) and reciprocal peak torque ratios (E/E ratios and F/F ratios) increased with velocities decrease; E/E ratios and F/F ratios difference in between 1-7 %. Conclusions: The findings of the present study indicate that the F/E ratios was not different between dominant/non-dominant leg, the E/E ratios and F/F ratios differ are lower than 10%. The results show that the softball players lower limb strength was not imbalance.

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