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Evaluation and Quantification of Manual Materials Handling Risk Factors

Sesek R., Gilkey D., Drinkaus P., Bloswick D. S., Herron R.

International Journal of Occupational Safety and Ergonomics

2003

Vol. 9, No. 3

271--287

This study investigated the ability of the Revised NIOSH Lifting Equation (RNLE) to measure the risk of low back injury as verified by employee health outcomes. In addition, several basic risk factors and combinations of risk factors presumed related to low back disorders were explored. The RNLE was modified to allow analysis of one-handed and two-handed, asymmetric lifts. Predictive performance was not changed. Simplifying the RNLE by removing several variables did not significantly reduce the RNLE’s predictive performance. These modifications to the RNLE show promise for increasing both the usability and utility of the RNLE.

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.