Purpose: The purpose of this study was to investigate the relationship between isokinetic knee and ankle extension, flexion with jumping performance (standing long jump and standing triple jump). Methods: Sixteen male students participated in this study. Their mean (± SD) age, height and body weight were 20.4 (± 2.06) years, 179.9 (±0.04) cm and 71.87(±5.8) kg respectively. All subjects performed five repetitions of 60º/s and 120º/s maximal knee and ankle extension, as well as flexion efforts of both legs. Pearson's Product Moment Correlation was used to test the relationship between isokinetic strength and jumping performance, Multiple Regression Analysis was also attempted. Results: The average peak torque at 60º/s and 120º/s were 218.67±44.44 Nm; 176.39±34.11 Nm in knee extension; 150.26± 23.53 Nm; 150.10±16.73 Nm in knee flexion and 28.32±6.88 Nm; 29.33±7.2 Nm in ankle extension; 120.09± 22.02 Nm; 102.83± 21.20 Nm in ankle flexion. There was significant positive relationship only in standing long jump (r= 0.520, p<0.05) with the isokinetic knee flexion at 120º/s however standing triple jump showed no significance with any isokinetic strength and power. Conclusion: The results indicated that there was a moderate relationship between isokinetic knee flexion torques and standing long jump. The ideal to predict jumping performance by isokinetic knee and ankle extension as well as flexion torque is questionable.
