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area union contractor requested NIOSH to conduct a study on a one-mile bridge that had over 2 million rebar ties. NIOSH investigators wanted to know if power tiers reduced WMSD risks for deck tying. The tying methods included pliers, battery powered tiers, and battery powered tiers with a 3 ft. extension handle. The extension handle allowed rodbusters to stand when tying the rebar.
Researchers measured the amount of wrist movement and forward bending rodbusters used with each tying method. Results showed that using pliers involved the most risk of injury. Using pliers required continuous wrist movements and unsupported stooping...
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