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Wrist and forearm posture from typing on split and vertically inclined computer keyboards.

Authors
Marklin-RW; Simoneau-GG; Monroe-JF
Source
Hum Factors 1999 Dec; 41(4):559-569
NIOSHTIC No.
20031298
Abstract
A study was conducted on 90 experienced office workers to determine how commercially available alternative computer keyboards affected wrist and forearm posture. The alternative keyboards tested had the QWERTY layout of keys and were of three designs: split fixed angle, split adjustable angle, and vertically inclined (tilted or tented). When set up correctly, commercially available split keyboards reduced mean ulnar deviation of the right and left wrists from 12 degrees to within 5 degrees of a neutral position compared with a conventional keyboard. The finding that split keyboards place the wrist closer to a neutral posture in the radial/ulnar plane substantially reduces one occupational risk factor of work-related musculoskeletal disorders (WMSDs): ulnar deviation of the wrist. Applications of this research include commercially available computer keyboard designs that typists can use and ergonomists can recommend to their clients in order to minimize wrist ulnar deviation from typing.
Keywords
Musculoskeletal-system-disorders; Repetitive-work; Office-workers; Keyboard-operators; Cumulative-trauma-disorders; Humans; Equipment-design; Human-factors-engineering; Ergonomics
Contact
Marquette University, Department of Mechanical and Industrial Engineering, P.O. Box 1881, Milwaukee, WI 53201-1881
CODEN
HUFAA6
Publication Date
19991201
Document Type
Journal Article
Email Address
ergo@marquette.edu
Funding Amount
72714
Funding Type
Grant
Fiscal Year
2000
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R03-OH-003184
Issue of Publication
4
ISSN
0018-7208
Priority Area
Musculoskeletal-system-disorders
Source Name
Human Factors
State
WI
Performing Organization
Marquette University, Department of Mechanical and Industrial Engineering, Milwaukee, Wisconsin
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