Faculty Publications

Title

Source document position as it affects head position and neck muscle tension

Document Type

Article

Keywords

Ergonomics, Muscle tension, Neck

Journal/Book/Conference Title

Ergonomics

Volume

39

Issue

4

First Page

593

Last Page

610

Abstract

Measurements of head position, mechanical load at C7, and level of muscle EMG activity in the muscles of the neck were compared across six document positions in both a reading task and a typing (word processing) task. Source documents, identified as a primary visual task, were placed in two positions in front of the subject, flat on the table to each side of the keyboard, and on a document stand at each side of the keyboard. Each of the 20 subjects performed both a reading task and a typing task in each of these document positions while measurements were taken. It was found that the greatest variations in head position occurred in head rotation with documents flat on the table. This document position on each side also produced the greatest level of muscle tension in both the neck extensors and, to a lesser degree, the sternocleidomastoid muscles. In addition, greater variability between document position measures was found in the typing condition. © 1996 Taylor & Francis Group, LLC.

Original Publication Date

3-1-1996

DOI of published version

10.1080/00140139608964483

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