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Notebook computer use on a desk, lap and lap support: effects on posture, performance and comfort.

Authors
Asundi-K; Odell-D; Luce-A; Dennerlein-JT
Source
Ergonomics 2010 Jan; 53(1):74-82
NIOSHTIC No.
20036336
Abstract
This study quantified postures of users working on a notebook computer situated in their lap and tested the effect of using a device designed to increase the height of the notebook when placed on the lap. A motion analysis system measured head, neck and upper extremity postures of 15 adults as they worked on a notebook computer placed on a desk (DESK), the lap (LAP) and a commercially available lapdesk (LAPDESK). Compared with the DESK, the LAP increased downwards head tilt 6 degrees and wrist extension 8 degrees . Shoulder flexion and ulnar deviation decreased 13 degrees and 9 degrees, respectively. Compared with the LAP, the LAPDESK decreased downwards head tilt 4 degrees, neck flexion 2 degrees, and wrist extension 9 degrees. Users reported less discomfort and difficulty in the DESK configuration. Use of the lapdesk improved postures compared with the lap; however, all configurations resulted in high values of wrist extension, wrist deviation and downwards head tilt. STATEMENT OF RELEVANCE: This study quantifies postures of users working with a notebook computer in typical portable configurations. A better understanding of the postures assumed during notebook computer use can improve usage guidelines to reduce the risk of musculoskeletal injuries.
Keywords
Biomechanics; Computer-equipment; Computers; Ergonomics; Injury-prevention; Laboratory-testing; Motion-studies; Muscles; Musculoskeletal-system; Musculoskeletal-system-disorders; Posture; Risk-analysis; Risk-factors; Author Keywords: lapdesk; laptop; musculoskeletal disorder; posture; upper extremity
Contact
Department of Environmental Health, Harvard School of Public Health, Boston, MA
CODEN
ERGOAX
Publication Date
20100101
Document Type
Journal Article
Funding Amount
121350
Funding Type
Grant
Fiscal Year
2010
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-003997; Grant-Number-R01-OH-008373
Issue of Publication
1
ISSN
0014-0139
Source Name
Ergonomics
State
MA
Performing Organization
Harvard University, Boston, Massachusetts
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