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The purpose of this study was to use EMG data of the erector spinae muscles synchronized with three-dimensional video techniques to determine the body's responses to asymmetric lifting under weight belt conditions. The subjects performed static maximum voluntary exertions and dynamic lifts from 0° and 45° from the midline of the body. Three weight belt conditions were used. EMG data revealed significant differences in EMG variables with belt conditions. Weight belt use decreased burst area, peak voltage, and maximum frequency. Kinematic data indicated a significant difference in the left knee and left and right elbow range of motion when the type of lift, symmetric or asymmetric, was considered. Lifting technique also produced a significant effect on the maximum and minimum velocity of the center of mass. The results of the study indicate that weight belt use is an effective means of reducing spinal compression and thus may be helpful in preventing low back injury. / School of Physical Education

Thesis (M.S.) -- Mississippi State University. Department of Agricultural and Biological Engineering. / Title from title screen. Includes bibliographical references.