Objective: To investigates into the relationship between concentric isokinetic strength and explosive force of the knee extensors among elite taekwondo players. Materials and methods: Fifteen senior male taekwondo players performed an Isokinetic Test at two different angular velocities (i.e., 60°/s and 180°/s) and a Five-Jump Test (5JT). The isokinetic parameters are the peak torque (PT), the average power (AP), the acceleration time (AT) and the peak torque time (TPT). 5JT variables are the absolute performances, relative to the lower limb size and related to body mass performances. Results: The performance in the horizontal expansion of taekwondo athletes is correlated to the quadriceps concentric isokinetic strength parameters. The PT and AP are correlated to the performance of 5JT brought back in the athlete's body mass, for the two speeds (P < 0.05). The TPT is correlated with a lower limbs length for the slow speed (60°/s). No significant correlation between the AT and all 5JT values for both test speeds. Conclusion: The size of the lower limbs and body mass athlete are so critical in 5JT performance and isokinetic testing speeds selected. The 5JT can be an effective way to evaluate the explosive strength of the lower limbs (i.e., flexors/extensors of hip, knee and ankle) predominately in taekwondo players.
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