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Electromyographic activity during typewriter and keyboard use.
KTH, School of Technology and Health (STH), Ergonomics. (Ergonomi)
1994 (English)In: Ergonomics, ISSN 0014-0139, E-ISSN 1366-5847, Vol. 37, no 3, 477-84 p.Article in journal (Refereed) Published
Abstract [en]

This study investigated how ergonomic design influences neck-and-shoulder muscle strain, through keyboard assessment. Muscular activity was measured electromyographically (EMG) from six muscles in the forearm and shoulders of eight experienced typists using each of five different types of keyboard: one mechanical, one electromechanical, and one electronic typewriter; one personal computer/word processor (PC-XT) keyboard; and one angled at 20 degrees in the horizontal plane. The impact on muscular activity of using a palmrest was also studied. The mechanical typewriter induced a higher strain in the forearm and finger muscles than did the modern typewriters and keyboards. These induced no different strain on the neck-and-shoulder muscles, except for the right shoulder muscle, which was more active with the electronic typewriter than with the other machines. Using a palmrest did not decrease the strain on the muscles investigated. Use of the 'angled' PC-XT keyboard did not influence the measured muscular load on the forearm and finger muscles compared to typing on an ordinary PC-XT keyboard, but decreased the extensor muscular strain compared to the electronic typewriter.

Place, publisher, year, edition, pages
1994. Vol. 37, no 3, 477-84 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:kth:diva-77575DOI: 10.1080/00140139408963664PubMedID: 8143692OAI: diva2:498436
NR 20140805Available from: 2012-02-12 Created: 2012-02-07 Last updated: 2012-02-12Bibliographically approved

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