Psychophysical lifting capabilities for overreach heights

Document Type

Article

Publication Date

1-1-1987

Abstract

Overreach height, in this study, is defined as the maximum reach height of individuals measured to the top of the cut-out box-handles while subjects stand with their heels raised. Since such postures are inherently unstable, knowing how much weight individuals are willing to lift across overreach lifting heights is important. Ten young adult male students (mean age 25.9 years, mean weight 70.8 kg and mean height 175 cm) voluntarily participated in a study designed to investigate the effect of lifting heights above reach height on the maximum acceptable weights of lift. The weight was lifted using a ‘free-style’ technique in the mid-sagittal plane from the floor, knuckle and shoulder heights to overreach heights (individuals stand with their heels raised to deposit the load). The maximum acceptable weight of lift, on the average, declined by approximately 14%, compared with the maximum acceptable weight of lift for reach heights, when the box was lifted to overreach heights. The magnitude of decline in the maximum acceptable weight was highest for the floor to overreach height compared with the knuckle to overreach and shoulder to overreach lifting heights. © 1987 Taylor and Francis Group, LLC.

Publication Source (Journal or Book title)

Ergonomics

First Page

901

Last Page

909

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