The purpose of this study was to quantify Stevens' power function for the heaviness of boxes being lifted and lowered. This was determined for 91 firemen using a ratio rating method. For 90/91 subjects the equation was satisfactorily fitted to a power relationship despite considerable variation between individuals. The mean exponent for perceived heaviness was 1·35 and fractionation point 0·06 kg. It was concluded that doubling a weight being lifted resulted in a 2·6 increase in perceived weight.
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Baxter et al. (1986) studied this question.
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