Initial wrist posture during typing as a function of keyboard height and slope
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Results indicated that flexion was minimum when the keyboard was 45 degrees from horizontal, and that overall the left wrist exhibited extension while the right wrist exhibited flexion. Ulnar deviation was minimized when the keyboard height was -10 cm below elbow height, and both ulnar and radial deviation were minimized at slope conditions 22 and 45 degrees from horizontal. Higher keyboard heights coupled with positive slopes reduced radial and ulnar deviation as did lower keyboard heights coupled with negative slopes.
For low keyboard heights, the right hand exhibited more extreme ulnar deviation than the left hand. Pronation was minimum when the keyboard was 10 cm above elbow height and -45 degrees from horizontal, and was maximum when the keyboard was -5 cm below operator elbow height and 45 degrees from horizontal. Correct words typed per minute was maximun1 at 0 degrees from horizontal, and decreased quadratically as slope was both increased and decreased.
- Masters Theses