Análise do comportamento cinemático do joelho, quadril, lombar e pelve durante a realização do exercício “flexão de joelho em pé” com intensidade progressiva

Abstract

The purpose of the current study was to examine the pelvic and lumbar comportment during the realization of the standing leg curl (SLC) exercise with progressive intensity trials, on young adults of both genders. With this purpose, 13 individuals were evaluated, with ages between 20 and 34, familiarized with weight resistance training (WRT) and with this particular exercise. The subjects were aware of the testing procedures and accepted to participate spontaneously. They were submitted to One Maximal Repetition Test (1MR) on SLC exercise, and were filmed at each attempt to overcome the workload. The variables (angles) were obtained by means of the Peak Motus Inc. System. The attempts were arranged by the relative intensities of the subjects’ trials, nearly 45%, 65%, 75% e 85% of the 1RM. For each of the intensities the following variables were analyzed: a) angles of the hip and knee joints; b) pelvic angles from the sagittal, frontal and transversal planes; c) the angle of the lumbar spine. The Kruskal-Wallis statistical test was realized to analyze the difference between the intensity groups; the Pearson Correlation was used to analyze the difference between variables and finally a descriptive analysis was also done. The results for the objective (a) demonstrated that at the end of the movement the values of the knee angles decreased with the increase of the intensity, and this late one also has shown to have expressive effect on angle values of the hip articulation where it was possible to observe that the hip flexes with the knee joint. The results of objective (b) showed that the pelvis inclines itself to the opposite side of the exercise and posterior rotates on the side which the exercise is being performed occurring simultaneously anterior inclination with the movement. The intensity was significant only for the inclination angles. The results of the objective (c) showed that the lumbar angle decreases with a SLC exercises. The intensity was influent at the second half of the movement. It has been concluded that during the SLC exercise occur a compensatory movement of the structure analyzed and also that the intensity was significant for some variables, for instance hip flexion, pelvic inclination and lumbar extension.