The quantification of mechanical work as a resource for analysis of postural control

Abstract

The study aims to propose two methods for calculating the amount of mechanical work (W) as a resource for analysis of postural control in individuals subject to motor disturbances, visual and / or are in the process of physical rehabilitation. This study addresses the W quantification performed by the muscle after the extension of the trunk to the upright position (self-disturbance) in subjects with preserved vision (VP) and temporary deprivation of vision (PMV) by two methods known as: i) Mechanical Work Total (W_tot) and ii) Mechanical Work of the Center of Mass (W_CM). The sample consisted of 10 healthy volunteers, males aged 25,6 (± 2,2) years. Five trials were performed for each volunteer in both conditions. An imaging system for tracking optoelectronic three-dimensional it used to collect data, consisting of 8 video cameras, with a frequency of capture of 200 Hz. The linear regression analysis W_tot and W_CM show strong correlation between the two conditions (r² = 0,77 for the VP condition and r² = 0,84 for condition PMV) and the Student t test was observed statistically significant differences (p<0,10) in the first attempt among the volunteers with VP and PMV for W_tot during the post-interval disturbance, and differences in W_CM the intervals [0,80]ms and [0,100]ms. It was concluded that the methods to calculate W_tot and W_CM investigate possible postural control after motor and visual disturbances may be used as a resource in physical rehabilitation.