Isokinetic profiling of knee extensors and flexors strength among Soccer players in three field positions: A meta-Analysis

Background: This meta-analysis evaluated isokinetic strength profiles in soccer players, focusing on the hamstring-to-quadriceps (H/Q) ratio across three field positions. Objective: To assess positional differences in isokinetic strength and hamstring-to-quadriceps (H/Q) ratios based on the categorization structure that permits comparative evaluation (DEF-MID-ATT). Methods: Included were studies that reported quadriceps and hamstring peak torque and H/Q ratios at 60°/s and 180°/s. Three positional pairs were compared: (1) defenders vs. midfielders, (2) defenders vs. attackers, and (3) midfielders vs. attackers. Results: Defenders maintained superior quadriceps and hamstring strength over both midfielders and attackers. They also maintained higher H/Q conventional and functional ratios than midfielders. Attackers displayed moderately stronger hamstrings than midfielders. Conclusions: Defenders’ greater quadriceps and hamstring strength (particularly versus midfielders) likely reflects the mechanical demands associated with their field roles. These findings suggest that position-specific strength profiling may help guide training targets and reference values in soccer.