A dynamic biomechanical evaluation of lifting maximum acceptable loads.

摘要: A biomechanical evaluation of the job-related stresses imposed upon a worker is potential means reducing high incidence rates manual material handling injuries in industry. model consisting seven rigid links joined at six articulations has been developed for this purpose. Using data from cinematographic analysis lifting motions calculates: (1) body position articulation angles, (2) angular velocities and accelerations, (3) inertial moments forces, (4) reactive forces each articulation, including L5/S1 joint. Results indicated effects common task variables. Larger load box sizes increased rise times peak values both vertical ground reaction predicted compressive forces. However, boxes with handles resulted higher than without handles. Also, larger subjects did not sufficiently compensate reduced weights order to maintain uniform Smoothed rectified EMG erector spinae muscles correlated significantly while measured also significantly, indicating validity as tool predicting job physical stresses.