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The paper highlights the need to determine applicability of various ergonomic assessment methods. The methods such as Ovako working posture analysing system (OWAS), Rapid entire body assessment (REBA) and Rapid upper limb assessment (RULA) were used for the evaluation. The current research is carried out in three phases. The first phase involves assessing 25 postures at four different load levels (100 postures) to confirm the existence of variation in outcome of assessment. In the second phase, 24 male participants were selected to simulate the selected set of 100 postures-load combination in the laboratory and their perceived exertion rating was noted. Phase three includes the result’s validation. ANOVA was carried out to identify significant factors. It may be concluded from the study that OWAS may be better suited to evaluate risk if the load is less than 5 kg. Similarly, REBA and RULA may be better suited for the load range 5 kg − 10 kg and load greater than 10 kg respectively. It is observed that outcome of assessment methods is insensitive to some posture cases. So, there is a need to identify all the insensitive zones within a method that has a considerable difference in perceived exertion.
Joshi et al. (Thu,) studied this question.