Atividade eletromiográfica da musculatura do quadríceps associado às diferentes posições do pé: um estudo piloto

The strengthening of the femoral quadriceps (FQ) muscular group is very important due to its function for moving. The joint position might generate modifications in muscular recruitment, therefore the objective of this study was to verify if the feet positions variations during knee extension, are efficient for the specific selection of the rectus femoris, vastus lateralis and vastus medialis muscles, that compose the FQ. Eleven female college students (age 22,36 ± 3,56 years old) participated in the study. The muscles activation was evaluated through surface electromyography, with bipolar configuration, in 3 series of 10 maximum repetition (MR) of bilateral knee extension, in three feet positions: neutral position, internal rotation and external rotation. The results do not indicate significant differences among the superficial FQ muscles in all feet positions. In conclusion, the results of the present study suggest that the variations in degrees of feet rotation during knee extension are not efficient for the specific selection of the muscles that compose the FQ.