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Objective: 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 isokinetic knee strength, vertical jump, and 30-m sprint performance. Material and Methods: Thirty-six soccer players volunteered to participate in the study. The vertical jump height, 30-m sprint time, and the isokinetic 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 correlation coefficient was used to analyze the relationships among the peak torque values and vertical jump and 30-m sprint performance. Results: H/Q ratio at 60°•s-1 and HM strength at 240°•s-1 were significantly greater in the dominant leg than that of the non-dominant leg (p<0.05). Vertical jump height correlated with 30-m sprint time (r=-0.40, p<0.05). QM strength correlated with 30-m sprint performance in the dominant and the non-dominant leg at 60°•s-1 (r=-0.36, p<0.05; r=-0.43, p<0.01, respectively) and at 240°•s-1 (r=-0.36, p<0.05; r=-0.34, p<0.05, respectively), and with vertical jumping at 60°•s-1 (r=0.37, r=0.38, p<0.05, respectively). Besides, dominant leg HM strength only showed a significant correlation with 30-m sprint performance at 240°•s-1 (r=-0.36, p<0.05). Conclusion: The results revealed that H/Q ratio at low velocity and HM strength at high velocity were higher in favor of dominant leg in 17-20 year-old players. The QM strength had a decisive role in vertical jump and 30-m sprint performances at low angular velocity, and in 30-m sprint performance at high angular velocity. In addition, only the HM strength of the dominant leg at high velocity was effective in 30-m sprint performance.

türkiye klinikleri spor bilimleri/türkiye klinikleri spor bilimleri dergisi

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