Pelvic positions during lifting, a multi factor analysis

The study is dedicated to the evaluation of the pelvic movements during the common acts involved in occupational lifting. Pelvic kinematics in terms o f angular rotation has been analyzed in a controlled set of experiments und er three methods of lifting while performing various lifting assignments, b y male and female subjects. The study was designed to evaluate positioning differences in anatomical geometry due to subject gender, object's weight a nd reach to object distances. Measurements of angular displacements describ e the geometrical motion of the pelvic during five phases of the lifting ac t. Analysis of the variance was performed on angular displacement, as recor ded for each lifting assignment. The findings are discussed in two modes, o ne for different values of lifting weights, and the other for different hor izontal reach distances. The paper presents an analysis of the factors affe cting the performance of lifting, which contributes to the effort directed toward prevention of back injury.