After that, volunteers had their knees positioned at 60° and were familiarized to the action they would do. After that, they were asked to perform 3 maximum voluntary isometric knee extension contractions for 5 s, with 1 min of rest interval between the contractions. Three min after the last contraction, subjects were familiarized with the isokinetic contraction and then performed 5 maximum isokinetic concentric knee extension contractions at 30º/s speed, from 90° to 15°, 0° being full extension, totaling up 75° of Range of Motion (ROM). Verbal encouragement37 as well as visual feedback from the equipment38 were given in an attempt to achieve a maximal voluntary effort level during all contractions each subject was asked to perform. The same procedures were repeated with the contralateral limb.