Although both muscle strength of lower limbs and ability to repeat high-intensity running, are of very importance for modern soccer players, little information is available on the relationship between these two factors. The aims of study were to examine the relationship between lower leg muscle strength and Yo-Yo intermittent recovery test level 2 (YoYoIR2) performance and single 20-m sprint performance in semi professional soccer players. Methods Twenty male semi-professional soccer players (age 24.3 ± 2.8 years, height 175.5 ± 5.5 cm, body mass 70.8 ± 6.3 kg) were participated in this study. Leg muscle strength was measured by isokinetic dynamometer within 10 days before and after the measurements of YoYoIR2 and 20 m sprint time. Results No significant relationship were seen between both absolute and relative peak isokinetic concentric knee extension and knee flexion torque of lower muscle strength and YoYoIR2, 20-m sprint time. Conclusion In conclusion, the data indicated the possibility that strength performance evaluated isokinetic muscle strength of lower limbs were the limited contribution to YoYoIR2 performance and 20-m sprint time in semi-professional soccer players.
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