Three Dimensional Measures of Trunk Motion Components during Manual Materials Handling in Industry

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Abstract
The objective of this study was to monitor and document the three dimensional spine motion components experienced during the performance of industrial work that is associated with various risks of low back disorder (LBD). An industrial study was performed that examined on-the-job trunk motions of 64 workers from 13 different industries. Trunk range of motion, velocity and acceleration were documented. Worker anthropometry, health history, external load moments, job satisfaction and risk (identified from OSHA 200 logs) were also recorded for the various jobs. The results identified and quantified those trunk motion characteristics as well as other workplace variables that were associated with high risk jobs. A regression model of job related LBD risk was also created based upon this information. The relationship between these motions and biomechanical loading of the spine as well as means to reduce the risk of LBD in the work place (based upon this study) are discussed.

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