Abstract

The present study aims to verify the isokinetic assessment of knee extension and flexion in soccer players, comparing the performance between soccer positions. The sample comprised 136 professional soccer players from five cities belonging to Brazil's first division during the competitive season. Participants separated by player positions – Strikers (S=29, height: 178.9±6.3cm, weight: 78.2±11.1kg) Wingers (W=10, height: 173.7±4.7cm, weight: 71.3±7.4kg), Midfield (M=50, height: 177±5.9cm, weight: 74.5±8.8kg), Goalkeeper (G=14, height: 189.9±4.9cm, weight: 88.4±5.8kg), and Defenders (D=21, height: 186.8±3.5cm, weight: 83.1±6.8kg). The following variables were determined: left anterior peak torque (quadriceps) (LQPT); right anterior peak torque (quadriceps) (RQPT); left posterior peak torque (hamstrings) (LPPT); right posterior peak torque (hamstrings) (RPPT); right quadricep/ right hamstring ratio (RQUADS/RHAMS, using percentage) and left quadricep/ left hamstring ratio (RQUADS/RHAMS, using percentage) and the respective side-to-side comparisons (Deficit = Right – Left peak torque). The equipment used to perform isokinetic tests was a dynamometer by Biodex System 4®. Peak torque, maximum repetitions, the energy used during this work, energy used in total isokinetic assessment work, and anaerobic work capacity (W) used in total isokinetic evaluation work were compared by ANOVA One-way and Bonferroni; comparisons considered p ≤0.05. The results showed a significant difference between goalkeepers and defenders > wingers and midfield in peak torque, maximal repetition, total work, and anaerobic work capacity of left anterior peak torque, left posterior peak torque, and right posterior peak torque. Such information may be valuable for more efficient monitoring of muscle strength profiles, improving the application of athletes' training, and identifying risk factors for injury.