Task demands for shovelling in non-erect postures

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Abstract
Five male subjects were trained to work in nonerect task postures and then shoveled in 5 task postures: normal erect, under ceilings set at 80 and 60% of normal stature; kneeling without ceiling restraint; and, kneeling under a ceiling set at 80% of kneeling height. The steady-state data for all 5 task postures were averaged with a resulting heart rate of 131 beats/min and an O2 uptake of 1.41 min. These averaged values compared well with studies of actual coal miners shoveling in normal working environments.

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