The influence of precision requirements and cognitive challenges on upper extremity joint reaction forces,moments and muscle force estimates during prolonged repetitive lifting |
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| Authors: | Caroline Joseph Tyson A.C. Beach Jack P. Callaghan |
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| Affiliation: | 1. Department of Kinesiology, Faculty of Applied Health Science, University of Waterloo, Waterloo, ON, Canada;2. Faculty of Kinesiology and Physical Education, University of Toronto, Toronto, ON, Canada |
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| Abstract: | Prolonged repetitive lifting is a whole-body exertion. Despite this, the roles and physical exposures of the upper extremities are frequently neglected. The influence of precision requirements and cognitive distractions on upper extremity responses when lifting was evaluated by quantifying several biomechanical upper extremity quantities. Nine participants completed four 30-min lifting tasks with and without simultaneous cognitive distractions and/or precision placement constraints. Specific metrics evaluated were joint reaction forces and moments (wrist, elbow and shoulder) and modelled shoulder muscle forces (38 defined shoulder muscle mechanical elements). The addition of a precision requirement increased several metrics by up to 43%, while the addition of the cognitive distraction task had minimal influence. Furthermore, several metrics decreased by up to 14% after the first 10 min of lifting, suggesting a temporal change of lifting strategy. |
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| Keywords: | mental processing manual handling cumulative loading musculoskeletal disorders occupational health |
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