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Interaction of Physical and Mental Work

Singh S., Aghazadeh F., Ray T. G.

International Journal of Occupational Safety and Ergonomics

2002

Vol. 8, No. 4

451--463

The objective of the research was to determine the effect of mental load on the physical capacity of an individual. An experiment involving 9 combinations of lifting tasks, 1 lowering task, and 3 treadmill tasks was conducted. Heart rate was measured and maximum acceptable weight of lift was determined using the psychophysical method. A simple multiplication task was used as the mental load. The output variables were determined with and without the mental task. The results indicate that the individual’s physical capacity decreased with the mental task while lifting from floor to knuckle and shoulder to reach lifting heights.

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.