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. 2003 Mar;34(2):125-30.
doi: 10.1016/S0003-6870(02)00145-X.

The Effect of an Ergonomic Computer Device on Muscle Activity of the Upper Trapezius Muscle During Typing

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The Effect of an Ergonomic Computer Device on Muscle Activity of the Upper Trapezius Muscle During Typing

M Tepper et al. Appl Ergon. .

Abstract

Objective: Investigate whether an ergonomic computer device, characterised by an inclined working area and keyboard localisation close to the screen (the Up-Line), decreases the muscle activity of the upper trapezius muscle.

Methods: In a crossover design 19 healthy subjects and 19 patients with Whiplash Associated Disorder (WAD) typed during 10 min at the Up-Line and at a standard workstation with 15 min of rest in between. During typing surface EMG was measured of the trapezius muscle. The subjects were asked to rate sitting comfort and complaints.

Results: Although most subjects subjectively preferred the Up-Line, on average no significant differences were found in muscle activity between the two workstations for both patients and healthy subjects. Individually in 5 healthy subjects (25%) and in 6 patients (31%) muscle activity was lower when working at the Up-Line.

Conclusion: Although some subjects subjectively prefer the Up-Line in sitting comfort, on average the Up-Line did not decrease the muscle activity, both in healthy subjects as in patients with WAD.

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