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Evaluation of Different Scales for Measurement of Perceived Physical Strain During Performance of Manual Tasks

Hernandez L., Alhemood A., Genaidy A. M., Karwowski W.

International Journal of Occupational Safety and Ergonomics

2002

Vol. 8, No. 4

413--432

The main objective of this study was to evaluate different scales of perceived strain during the performance of various physical tasks. A total of 52 male and female participants took part in 4 experiments to achieve the study objective. The results suggest that a bipolar comfort-discomfort scale is a more appropriate instrument than a discomfort scale for assessing cumulative physical stresses at work, especially at the beginning of the shift. For assessing discomfort at the end of the work shift, a unipolar scale may also be used. On the basis of the obtained results, red, green, and yellow zones are suggested to establish priorities for work redesign efforts in ergonomic control programs.