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Wrist and forearm postures of users of conventional computer keyboards.

Authors
Simoneau-GG; Marklin-RW; Monroe-JF
Source
Hum Factors 1999 Sep; 41(3):413-424
NIOSHTIC No.
20031352
Abstract
The aim of this study was to perform a comprehensive investigation to document wrist and forearm postures of users of conventional computer keyboards. We instrumented 90 healthy, experienced clerical workers with electromechanical goniometers to measure wrist and forearm position and range of motion for both upper extremities while typing. For an alphabetic typing task, the left wrist showed significantly greater (p < .01) mean ulnar deviation (15.0 degrees +/- 7.7 degrees) and extension (21.2 degrees +/- 8.8 degrees) than the right wrist (10.1 degrees +/- 7.2 degrees and 17.0 degrees +/- 7.4 degrees for ulnar deviation and extension, respectively). Conversely, the right forearm had greater mean pronation (65.6 degrees +/- 8.3 degrees) than the left forearm (62.2 degrees +/- 10.6 degrees). We noted minimal functional differences in the postures of the wrists and forearms between alphabetic and alphanumeric typing tasks. Ergonomists should consider the statistically significant and probable practical difference in wrist and forearm posture between the left and right hand in ergonomic interventions in the office and in the design of computer keyboards. Actual or potential applications of this research include guiding the design of new computer keyboards.
Keywords
Musculoskeletal-system-disorders; Repetitive-work; Office-workers; Keyboard-operators; Cumulative-trauma-disorders; Humans; Equipment-design; Human-factors-engineering; Ergonomics
Contact
Department of Physical Therapy, Marquette University, Milwaukee, WI 53201-1881
CODEN
HUFAA6
Publication Date
19990901
Document Type
Journal Article
Email Address
simoneaug@vms.csd.mu.edu
Funding Amount
72714
Funding Type
Grant
Fiscal Year
1999
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R03-OH-003184
Issue of Publication
3
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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