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Ergonomics. 1999 Oct;42(10):1333-49.

Effects of keyboard tray geometry on upper body posture and comfort.

Author information

1
Department of Design and Environmental Analysis, Cornell University, NYS College of Human Ecology, Ithaca 14853-4401, USA. ah29@cornell.edu

Abstract

The effects of a downward-tilting (DT) keyboard tray on wrist posture, seated posture and self-assessed musculoskeletal discomfort were investigated in a field experiment. Thirty-eight professional office workers were studied. A pretest assessed how they typed using either a conventional keyboard on a desk or on an articulating keyboard tray, and with or without wrist rests. Workers were randomly allocated to a control (n = 15) or test group (n = 23) that used their existing keyboard in a DT system. A post-test was conducted 3 weeks later. Results showed no significant changes in wrist posture, seated posture or reports of musculoskeletal discomfort for the control group, and approximately 50% of typing wrist movements put the hand in a neutral zone. There were significant improvements in wrist posture, seated posture and upper body musculoskeletal discomfort for the test group using the DT system. Over 80% of typing wrist movements put the hand into a neutral zone with the DT arrangement. Reactions to using a conventional keyboard on a DT system were positive.

PMID:
10582503
DOI:
10.1080/001401399184983
[Indexed for MEDLINE]

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