Document Detail

Does elevating and tilting the input device support surface affect typing force and postural exposures of the wrist?
MedLine Citation:
PMID:  21673446     Owner:  NLM     Status:  In-Data-Review    
Objective: Compare wrist kinematics and typing force during computer work across two workstations, one configured according to recommended guidelines with the keyboard support surface flat and near resting elbow height, the other according to users' actual setup and preference, with an elevated, and positively tilted support surface. Participants: Twenty participants completed a standard computer task at the two workstation configurations. Methods: A thin profile force plate, placed under the keyboard recorded keyboard reaction forces. Twin axis electro-goniometers (SG65 Biometrics Ltd, London, UK) affixed to the back of the right and left hand of each subject continuously measured wrist extension/flexion and ulnar/radial deviation.Results: Typing force and wrist kinematics were similar between the two configurations with only 10th percentile ulnar deviation for the right hand showing a borderline significant difference of 1° between the two configurations. Conclusion: Elevating and tilting the input device support surface does not necessarily affect typing force and kinematics of the wrist. The combination of the input device support surface and user upper extremities form a complex kinematic system with several degrees of freedom. Wrist postures during computer use are a function of multiple factors other than simply keyboard tilt.
Krishna Asundi; Peter W Johnson; Jack T Dennerlein
Related Documents :
23899596 - Circadian clocks, food intake, and metabolism.
17708216 - Human influence on california fire regimes.
22696586 - Effect of stimulation frequency on immediate freezing of gait in newly activated stn db...
10367966 - Balanced interactions in ganglion-cell receptive fields.
18965786 - High performance optical absorbance detectors based on low noise switched integrators.
14759496 - The phototransduction cascade in the isolated chick pineal gland revisited.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Work (Reading, Mass.)     Volume:  39     ISSN:  1875-9270     ISO Abbreviation:  Work     Publication Date:  2011  
Date Detail:
Created Date:  2011-06-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9204382     Medline TA:  Work     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  187-93     Citation Subset:  IM    
Department of Environmental Health, Harvard School of Public Health, Boston, MA, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Ergonomic evaluation of ten single-channel pipettes.
Next Document:  The effect of two alternative arm supports on shoulder and upper back muscle loading during pipettin...