Comparison of Isokinetic Knee Strength Between the Dominant and Non-dominant Legs and Relationships Among Isokinetic Strength, Vertical Jump, and Speed Performance in Soccer Players

Abstract

A AB BS ST TR RA AC CT T O Ob bj je ec ct ti iv ve e: : The purpose of this study was to compare isokinetic knee strength of the dominant and non-dominant legs in 17-20 year-old soccer players and to investigate the relationships among isoki-netic knee strength, vertical jump, and 30-m sprint performance. M Ma at te er ri ia al l a an nd d M Me et th ho od ds s: : Thirty-six soccer players volunteered to participate in the study. The vertical jump height, 30-m sprint time, and the isoki-netic strength of hamstring (HM) and quadriceps muscles (QM) at angular velocities of 60 and 240° • s -1 were determined using jump-meter, photocell, and an isokinetic dynamometer, respectively. Isokinetic knee strength between the dominant and non-dominant legs was compared using the paired t-test. Pearson cor-relation coefficient was used to analyze the relationships among the peak torque values and vertical jump and 30-m sprint performance. R Re es su ul lt ts s: : H/Q ratio at 60° • s -1