EFFECTS OF A CHAIR MOUNTED SPLIT KEYBOARD ON POSTURE COMFORT AND PERFORMANCE
Gregory Shaw
Alan Hedge
Cornell Univ., Dept. DEA
and
John Bertram
Cornell Univ., Dept. Anatomy
August, 1996
SLIDES
Effects of a Chair Mounted Split Keyboard...
Justification:
Researchers have linked typing posture to keyboard related injuries.
How is posture related to musculoskeletal injury?
Design Interventions
An alternative design intervention:
The manufacturer claims the following:
Research Design
Research questions
Study Design
Dependent variables
Experimental Protocol
Results
Comparison of extreme wrist angles
Ulnar deviation means for all 12 subjects
Wrist extension means for all 12 subjects
Influence of secondary variables on wrist posture.
Wrist posture during cursor positioning
Upper body posture - Videomotion Analysis
Postural variables while typing
Postural variables while cursor positioning
Upper Body Posture I
Upper Body Posture I (Continued)
Upper Body Posture II
Upper Body Posture II (Continued)
Typing performance:
Typing accuracy (%)
Individual Questionnaire Results:
Comparison Questionnaire Results:
Discussion
Follow up study:
Follow-up study results:
Wrist movement scatter plot for subject #6
Wrist movement scatter plot for subject #2
Upper body posture
Contradictory evidence:
Implications:
Future Study
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