The determination of isokinetic performance values of knee joint and Hamstring (flexor)/Quadriceps (extensor) ratios differences in Volleyball players’

Abstract

The aim of this study was to determined the values of isokinetic performance in knee joint and the ratios of hamstring/quadriceps (H/Q) between volleyball players and controls. 30 male volleyball players (age: 19,46±2,1) and 30 male controls (age: 19,66±2,0) were participated in this study. This study investigated hamstring and quadriceps muscles strength ratio obtained during concentric muscle contraction. The ratio of H/Q muscle strength which was an indicator of normal balance between the knee flexors and extensor and it is important to estimate of the capacity for stabilization of knee joint and the preventation of disability. Knee flexion and extension measurements were tested on biodex system–3 dynamometer in %60, %180 and %300 deg/sec test protocols. The range of motion of knee Joint was evaluated by biodex system–3 dynamometer. There was no statistical difference in the ROM of the knee joint between volleyball players and controls (p>0,05). The isokinetic values of volleyball players were significantly higher than controls (p<0,05). H/Q values must be determined to prevent disability. For the aim of get ready for the season and supply the continuity of performance level increases, preseason isokinetic testing of athletes may be helpful to test for strength imbalance and to determine the correct exercises which is suitable for remove the H/Q disproportion.