title: ARE THERE DIFFERENCES IN STRENGTH TESTS USING ISOKINETIC DYNAMOMETRY BETWEEN FIELD AND INDOOR PROFESSIONAL SOCCER PLAYERS?
abstract: OBJECTIVE
  The objective of this study was to conduct a comparative analysis on isokinetic strength assessments between field and indoor male professional soccer players and correlate the findings with the higher levels of injury risk described in the literature.
  
  
  METHODS
  We analyzed 16 field soccer players and 15 indoor soccer players. All these professionals were male. Isokinetic muscle strength assessments were made on their knees.
  
  
  RESULTS
  The mean weight was 81.81 kg for field soccer and 80.33 kg for indoor soccer. The right and left peak extensor torque left and right for field soccer and indoor soccer were, respectively, 302.50 and 313.31 Nm and 265.20 and 279.80 Nm, and for flexors, 178 and 184.88 Nm and 158.27 and 154 Nm. The peak torque rates according to body weight for the left and right extensors for field soccer and indoor soccer were, respectively, 3.84 and 3.7 Nm/kg and 3.32 and 3.52 Nm/kg, and for flexors, 2.17 and 2.26 Nm/kg and 1.98 and 1.93 Nm/kg. The balance relationships between flexors and extensors on the right and left sides for field soccer and indoor soccer were, respectively, 59.81 and 59.44% and 60.47% and 54.80%. The relationships for extensors between the right and left sides for field soccer and indoor soccer were, respectively, 11.44 and 9.20%, and for the flexors, 7.31 and 8.80%.
  
  
  CONCLUSIONS
  In accordance with international parameters, comparative analysis on isokinetic strength assessments between field and indoor male professional soccer players before the season showed that there was muscle balance and low probability of injury. There were no statistically significant differences in the parameters analyzed between the players of the two types of soccer.
authors.affiliation: MSc in Orthopedics and Traumatology from the School of Medical Sciences, Santa Casa de São Paulo; Volunteer Physician in the Sports Trauma Group, Santa Casa de São Paulo, São Paulo, SP, Brazil.
authors.forename: Adriano Barros
authors.initials: AB
authors.lastname: de Aguiar Leonardi
authors.affiliation: Volunteer Physician in the Sports Trauma Group, Santa Casa de São Paulo, São Paulo, SP, Brazil.
authors.forename: Mauro Olivio
authors.initials: MO
authors.lastname: Martinelli
authors.affiliation: Head of the Sports Trauma Group, Department of Orthopedics and Traumatology, School of Medical Sciences, Santa Casa de São Paulo, São Paulo, SP, Brazil.
authors.forename: Aires Duarte
authors.initials: AD
authors.lastname: Junior
keywords: Isometric Contraction; Muscle Strength Dynamometer; Soccer