Abstract
Thirty males and thirty females performed lifting tasks while being exposed to varying levels of physical (box weight, task asymmetry), psychosocial (social support and mental concentration), and combination (lift rate, box placement) workplace factors. The study investigated the impact of these variables as well as individual factors (gender, personality) on trunk kinematics and kinetics, muscle activity, and the three-dimensional spinal loads. The study results indicate box weight, placement control, individual's anthropometry, and to a lesser extent gender and personality directly impact the loads on the spine as well as the trunk kinematics, kinetics, and muscle activity. Both the physical and mental aspects of the workplace must then be considered when developing ergonomic interventions.
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