Careful selection and training of workers, and good job design have not substantially reduced the incidence of low back injuries. Therefore, reduction in number and severity of such injuries has become a priority concern of many researchers. The specific question addressed by this research was “Are there any discrepancies between the rankings for the lifting tasks based on the subjective estimates of stress at the lower back and the rankings based on compressive force at L5/S1 predicted by the biomechanical model?” The results showed that some of the tasks evaluated to be less severe biomechanically were evaluated to be severe based on the subjective estimation of stress at the lower back.
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