Comparative analysis of knee extension movement in the extensor chair, associated with ankle dorsiflexion or plantar flexion during hypertrophy training in women

Abstract

The topic addressed in this article is the comparative analysis of knee extension movement on the leg extension machine, associated to dorsiflexion or plantar flexion of the ankle during the hypertrophy training on women, with the aim of performing a comparative analysis aimed at identifying if the dorsiflexion, according to Alter (2001), consists of moving the foot upwards, approaching the leg, or plantar flexion - also according to the same author's considerations -, opposing moving the foot downwards distancing it from the tibia, assists in the muscular hypertrophy of the quadriceps group when executed in the extensor chair. The current study happened at Top Fitness gym, located at the city of São Bento do Sul/SC, where 20 (twenty) students were evaluated, with the age group between 18 (eighteen) to 40 (forty) years old, with the BMI between 21,6 to 43,5 kg/m². The students were randomly divided into two groups (dorsiflexion and plantar flexion), being that, they were submmited to MR Test (maximum repetition) on the leg extension machine proposed by Prestes e Marchetti (2102) and anthropometrically evaluated following the Pollock e Wilmore protocol (1993) for skin folds and also the perimeter protocol cited by Petroski (2009), during the 18 (eighteen) weeks through their hypertrophy training. It has been verified through the statistically analysis of Student, the T test with significance (<0,05) that, all the students had a decrease of skinfolds at the region of the medial thigh, but the plantar flexion group (2) obtained a greater decrease and, consequently, evidencing that the data were of greater significance (<0,05) in this group. It is also possible to observe that there was a decrease in the perimeter and not an increase, so, the muscular hypertrophy were not significant to prove that there was hypertrophy in women during this exercise.