本研究的主要目的在探討最大等速膝仲展肌力與蹲踞跳及下蹲跳之垂直跳躍指標闊的相關性，並探討彈動動作(counter-movement)在增進動作表現中的機制與意義。受試對象為17位中年男性。受試者在Cybex6000等速測力 儀從事每秒60度及120度的等速膝伸展最大肌力測試。蹲踮跳與下蹲跳如使用Kistler測力板各跳三次，以表現最佳的一次作為依據，藉由電腦軟體分析兩種不同跳躍方法之跳躍高度、最大力量、動力、快速肌力指數、至最大力量時間、最大發力率與總功量。研究發現:蹲路跳躍高度與總功量顯著低於下蹲跳(0.47m)，與至最大力量時間則長於下蹲跳;兩種跳法於跳躍高度、至最大力量時間、總功量上有顯著的相關性(p<.05);每秒60度和每秒120度最大等違膝仲展肌力分別與蹲路跳的最大力量(Fmax)呈顯著相關(r=.677& r= .730， p<.01) ，除以體重的每秒120度最大等速膝仲展肌力亦與除以體重的蹲路跳最大力量(Fmax/BW)主顯著相關(r=0.488，p<.05) ;每秒60度最大等速膝仲展肌力與蹲路跳的最大功率呈顯著相關(r=.567，p<.05) ，每秒120度最大等速膝伸展肌力更分別與下蹲跳與蹲路跳的最大功率呈顯著相關(r=.654& r=.687， p<.Ol)。主要的研究結論為:←)下蹲跳能較快地達到最大力量，提 高垂直跳躍高度;ω等遠向心肌力不通於作為評估垂直立定跳運動表現的工具;(;)膝關節伸展等速向心肌力的量iQ1並不會對量測肌群不會對作用肌群產生牽張反射，而量測到作用肌群的反射性肌力。

The purposes of this study were firstly to detennine the relationship between the concentric isokinetic peak torque and the vertical-jumping indexes， secondly to observe the significant difference between the vertical-jumping indexes of squat jump (SJ) and counter-movement jump (CMJ)， 17 mid-aged healthy males participated in this study. The concentric isokinetic peak torque (knee extension: 60 degree· S-l and 120 degree ﹒S-l)of each subject was obtained by Cybex 6000. Then，the subjects perfonned SJs and CMJs three times individually with their maximal effort on the Kistler force plate. Thevertical-jumping indexes， jump height (JH)，maximal force (Fmax)， maximal power (Pmax)， SSI, RFD， total work (W)， and the time to maximal force (Tmax)， were computed by Bioware Perfonnance Module Biomechanical Software Analysis System (version 1.0)on a computer. TheJH， Tmax， & W were significantly different between CMJ and SJ (p<.05); TheE60p and E120p correlated to Fmax in SJ significantly (r=.677 & r=.730，. p<.Ol)， and the E120p correlated to Pmax in SJ and CMJ (r=.654 & r=.687， p<.Ol). All the data suggest that: (1 )To reach the Fmax more fast in CMJ resulted in greater height in CMJ than SJ; (2)The concentric isokinetic peak torque is not suitable to evaluate the performance of standing vertical jump; (3) There was no counter-movement to induce the stretch reflex in the activated muscle group during isokinetic torque tests.