Abstract
The purpose of current study was to investigate the effects of vertical ground accelerations induced by simulated wave motions on trunk muscle activation and trunk kinematics during manual materials handling tasks. Sixteen subjects performed lifting, lowering and static weight-holding tasks under ten different combinations of load mass and vertical acceleration of the ground surface (ten different effective loads). The results showed that this effective load had a significant effect on the peak sagittal plane angular acceleration during lifting and peak sagittal plane angular deceleration during lowering. The EMG results indicate that the boat motions tend to amplify the effects of the slant of the lifting surface.
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