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Effect of a worktable position on head and shoulder posture and shoulder muscles in manual material handling.

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Effect of a worktable position on head and shoulder posture and shoulder muscles in manual material handling.

Work. 2014 May 27;

Authors: Kim MH, Yoo WG

Abstract
BACKGROUND: According to a recent research, manual working with high levels of static contraction, repetitive loads, or extreme working postures involving the neck and shoulder muscles causes an increased risk of neck and shoulder musculoskeletal disorders.
OBJECTIVE: We investigated the effects of the forwardly worktable position on head and shoulder angles and shoulder muscle activity in manual material handling tasks.
METHODS: The forward head and shoulder angles and the activity of upper trapezius, levator scapulae, and middle deltoid muscle activities of 15 workers were measured during performing of manual material handling in two tasks that required different forward head and shoulder angles.
RESULTS: The second manual material task required a significantly increased forward head and shoulder angle. The upper trapezius and levator scapulae muscle activity in second manual material task was increased significantly compared with first manual material task. The middle deltoid muscle activity in second manual material task was not significantly different compared with first manual material task.CONCLUSIONS: Based on this result, the forward head and shoulder angles while performing manual work need to be considered in selection of the forward distance of a worktable form the body. The high level contractions of the neck and shoulder muscles correlated with neck and shoulder pain. Therefore, the forward distance of a worktable can be an important factor in preventing neck and shoulder pain in manual material handling workers.

PMID: 24894687 [PubMed – as supplied by publisher]

Effect of a worktable position on head and shoulder posture and shoulder muscles in manual material handling | Work related upper limb disorder

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