Avaliação da assimetria e déficit bilateral de músculos extensores de joelho em praticantes de futsal da Universidade Federal de Uberlândia

Abstract

Introduction: The main changes identified as risk factors for soccer injury are asymmetries in the parameters of muscular performance between dominant and non-dominant limbs and changes in the torque relation between antagonistic muscles. Objective: To evaluate and compare the maximal force production and electromyographic activity of the rectus femoris and vastus lateralis muscles in the exercise of isometric knee extension, in unilateral and bilateral conditions, in futsal athletes of the Federal University of Uberlândia. Methodology: The sample consisted of 12 university athletes with a mean age of 21.33 ± 2.22. The protocol consisted of two maximal voluntary isometric contractions under unilateral and bilateral conditions. The maximum force was collected through a load cell while the muscular signal was obtained through an electromyograph. For the contractions, an adapted extensor chair was used. Results: There were no significant differences (p> 0.05) in the values of maximum force production in the right and left unilateral conditions and no significant difference (p> 0.05) was found between the values of maximum isometric force production in the bilateral condition and sum of unilateral values. In addition, positive values of the bilateral strength index and the electromyographic signal were observed; however, no significant differences (p> 0.05) were observed in the bilateral force index and electromyographic signal values compared to the zero reference value. Conclusion: It was concluded that there was no bilateral deficit and asymmetry of strength between dominant and non-dominant limbs in knee extensor muscles in university futsal practitioners. It was observed an IBf > 0 accompanied by IBemg > 0, evidencing the presence of bilateral facilitation in volunteers practicing university futsal.