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Effect on discomfort of frequency of wrist exertions combined with wrist articulations and forearm rotation

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posted on 2017-04-11, 14:40 authored by Abid Ali Khan, Leonard O'SullivanLeonard O'Sullivan, Timothy J. Gallwey
This study investigated the combined effects of forearm rotation, radial/ulnar deviation and flexion/extension on discomfort score for two levels of frequency (10 exertions/min and 20 exertions/min) in a repetitive wrist flexion task with a force of 10 N. There were three levels of wrist deviation (neutral, 35%ROM in radial and ulnar), three levels of wrist flexion/extension (neutral, 35%ROM in flexion and extension) and three levels of forearm rotation (neutral, 60%ROM in prone and supine). The dependent variable was discomfort on a Visual Analogue Scale. ANOVA results showed that there were highly significant effects of all the main factors (p < 0.001) on discomfort. The two-way interaction of forearm rotation with radial/ulnar wrist deviation was highly significant (p = 0.001) as was forearm rotation by participant. Similarly, three of the three-way interactions and one four-way interaction were highly significant (p < 0.001 and p < 0.01), probably due to having participants as one of the factors in them. Posture changes from neutral to 35%ROM increased discomfort by about 20%, but combinations of deviated postures increased discomfort by up to 70%. The higher frequency increased discomfort by 28%. Some of the increase in discomfort appears to have been due to reductions in wrist flexion MVC at non-neutral postures.

History

Publication

International Journal of Industrial Ergonomics;40 (5), pp 492-503

Publisher

Elsevier

Note

peer-reviewed

Rights

This is the author’s version of a work that was accepted for publication in International Journal of Industrial Ergonomics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Interational Journal of Industrial Ergonomics, 2010, 40 (5), pp. 492-503, http://doi.org/10.1016/j.ergon.2010.05.003

Language

English

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