Variation in upper limb posture and movement during word processing with and without mouse use

Lena Karlqvist · Mats Hagberg · Kristina Selin

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Ergonomics and Musculoskeletal Disorders Technostress in Professional Settings Occupational health in dentistry

Abstract

Work postures and movements of the upper limb were analysed for 12 'mouse' operators and 12 'non-mouse' computer operators employed in word-processing work. Measurements were carried out during correction of a given text. 'Mouse' operators spent 64% of the working time with the operative wrist deviating more than 15 degrees towards the ulnar side, while 'non-mouse' operators spent 96% of the time with the corresponding wrist in neutral position towards radial deviation. The rotation in the shoulder was at all times in neutral position towards inward rotation for 'non-mouse' operators, while 'mouse' operators worked 81% of the time with the shoulder rotated outward more than 30 degrees. 'Mouse' operators corrected a longer text during the given time. Our observations showed long periods of strenuous working postures for 'mouse' operators compared to 'non-mouse' operators. We believe that further investigations need to be carried out on the effects of word-processing techniques and to develop ergonomic work station designs for the 'mouse' and other non-keyboard input devices.

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References

1987Standardised Nordic questionnaires for the analysis of musculoskeletal symptoms 1991Work Posture, Workstation Design, and Musculoskeletal Discomfort in a VDT Data Entry Task 1981Postural and visual loads at VDT workplaces I. Constrained postures

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