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Protection of Human in the Working Environment

This study recruited 16 industrial workers to examine the effects of material, weight, and base area of container on reduction of grip force (∆GF) and heart rate for a 100-m manual carrying task. This study examined 2 carrying materials (iron and water), 4 carrying weights (4.4, 8.9, 13.3, 17.8 kg), and 2 base areas of container (24 ́ 24 cm, 35 ́ 24 cm). This study showed that carrying water significantly increased ∆GF and heart rate as compared with carrying iron. Also, ∆GF and heart rate significantly increased with carrying weight and base area of container. The effects of base area of container on ∆GF and heart rate were greater in carrying water condition than in carrying iron condition. The maximum dynamic effect of water on ∆GF and heart rate occurred when water occupied ~60%–80% of full volume of the container.