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.