Abstract
The primary objective of this work was to investigate dynamic psychophysical (acceptable) material handling strengths (capabilities) of an older population (aged 55–74 years; n = 20). The findings are presented in two parts. Part I deals with manual lifting capabilities; Part II deals with manual carrying capabilities. In order to determine dynamic psychophysical strengths, routine everyday tasks were simulated in the laboratory. Lifting activities simulating work-related tasks included eight sequences of lifting (two lifting heights × four lifting frequencies); for each sequence, the maximum acceptable weight of lift (MAWL) was determined. Psychophysical lifting strengths of a younger population (18–35 years; n = 20) were also determined to find how the MAWL of the older population differed from that of the younger population. In addition to the MAWL, a number of responses at the MAWL were recorded: heart rate (HR), oxygen uptake (VO2), and category-ratio ratings of perceived exertion (CRRPE). The results indicated no practically significant age-related differences in responses between either the older and younger males, or older and younger females. Based on the limited data collected in this study, it appears that age has no significant influence on people's capability to lift loads. Consequences of these findings on design are discussed.
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Wright, U.R., Mital, A. Maximum Weights of Handling Acceptable to People Aged 55–74 Years: Part I. Lifting. J Occup Rehabil 9, 3–13 (1999). https://doi.org/10.1023/A:1021385230426
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DOI: https://doi.org/10.1023/A:1021385230426