The aims of this study were 1) to assess the ergonomic physical risk factors from
practitioner’s viewpoint in a truck assembly plant with an in-house observational method
and the NIOSH lifting equation, and 2) to compare the results of both methods and their
differences. The in-house ergonomic observational method for truck assembly i.e. the
SCANIA Ergonomics Standard (SES) and the NIOSH lifting equation were applied to evaluate
physical risk factors and lifting of loads by operators. Both risk assessment approaches
revealed various levels of risk, ranging from low to high. Two workstations were
identified by the SES method as high risk. The NIOSH lifting index (LI) was greater than
two for four lifting tasks. The results of the SES method disagreed with the NIOSH lifting
equation for lifting tasks. Moreover, meaningful variations in ergonomic risk patterns
were found for various truck models at each workstation. These results provide a better
understanding of the physical ergonomic exposure from practitioner’s point of view in the
automotive assembly plant.
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