Intra- and Inter-Limb Strength Asymmetry in Soccer: A Comparison of Professional and Under-18 Players

(1) Background: the present study examined isokinetic peak torque exerted by both knee extensors and flexors, anterior–posterior imbalance magnitude direction of inter-limb asymmetry in professional academy soccer players. (2) Methods: one hundred players (professional = 50, elite 50) volunteered to take part this investigation. An dynamometer was used measure extensor (quadriceps) flexors muscle (hamstrings) torques limbs as well asymmetries—using a standard percentage difference equation. (3) Results: exhibited significantly greater (effect size [ES] large) strength levels quadriceps hamstrings under testing conditions, higher (small moderate) intra-limb ratio values for 60°·s?1 but not 300°·s?1 test condition, lower all with exception at poor slight, indicating that limb dominance rarely same between groups. (4) Conclusions: shows assessments, i.e., ratio, subsequent asymmetry, direction, can differentiate