Análise cinemática do deslocamento vertical do movimento pélvico durante a marcha

Abstract

The purpose of the gait is the displacement of the body in the terrestrial environment efficiently, keeping the balance in a static and dynamic condition. It is also responsible for coordinating posture, balance and locomotion through the alternate advancement of one of the lower limbs while the other acts on the support of the body weight. So, the analysis of gait variability has been the focus of research in different fields of science. The purpose of the gait analysis is to improve the understanding of the problems involving the locomotor system, to determine a decision about the indication of surgical procedures, the prescription of orthoses or prostheses, physiotherapy for rehabilitation or even to improve the performance of athletes. The aim of this study was to develop a method to identify step and stride time intervals as well as variability by the coefficient of variation of these intervals and the extracted features. The study consisted of a group of seven individuals (22.86 ± 1.47 years) from the local community who walked on a treadmill for a period of one minute with two markers positioned on the anterior-posterior iliac spine on both sides of the pelvis, and the pelvic movement was captured by 10 infrared cameras positioned around the treadmill. For the analysis, the coordinates of the Z axis (vertical direction) were chosen, and the average and the 95% confidence interval estimated for the average of the step and stride time intervals were in agreement with the literature, as well as the coefficient of variation for these intervals. The Shapiro-Wilk test verified the normality (p> 0.05) of the intervals. It was also verified the variability of the features extracted between the limbs, and between the step and step intervals. The step intervals presented greater variability when compared to the group intervals.