A comparison between psychophysical and physiological approaches across low and high frequency ranges.
J Hum Ergol 1985 Dec; 14(2):59-64
Psychophysical and physiological approaches used to evaluate manual lifting capabilities were compared. Maximum acceptable weight of lift and metabolic energy expenditure rate data were collected from 37 industrial males and females. The variables in the lifting task were four lifting frequencies, three lifting heights, and three box sizes. The data were presented on graphs of oxygen uptake versus weight and lift frequencies, and weight versus frequency. At 29 percent of physical work capacity (PWC), the physiologically acceptable weight level for males was about 17.5 kilograms (kg) at one lift per minute, and about 9.5kg at 12 lifts per minute. For females at a PWC of 28 percent, the corresponding weight level was 16kg at one lift per minute and 8.5kg at 12 lifts per minute. Weight estimates based on the physiological fatigue criterion were consistently higher than psychophysical weight estimates. The differences ranged from 0.3 at 12 lifts to 4.3kg at one lift for males. The corresponding differences for females ranged from 0.4 to 5.5kg, respectively. The differences increased sharply below four lifts per minute. The author concludes that psychophysical and physiological weight estimates are not as different as previously thought.
Humans; Industrial-factory-workers; Repetitive-work; Work-analysis; Work-capacity; Work-performance; Psychophysiological-testing; Weight-factors; NIOSH-Publication; NIOSH-Grant; Manual-lifting; Manual-materials-handling
Journal of Human Ergology
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