Abstract
The purpose of this study was to determine the effects of repetitive lifting on trunk muscle activity and spine kinematics during an intense, forty minute, asymmetrical lifting and lowering task. Contrary to many previous sagittal plane materials handling studies, the asymmetrical task did result in differences in kinematics between lifting and lowering. Further, there were few consistent effects of fatigue on trunk muscle activity and only spine flexion was observed to decrease over the course of the trials. However, some individual subjects did demonstrate fatigue related changes that may have increased their risk of injury if performed over prolonged periods.
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