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This study aimed to evaluate the effect of the number of fingers used during typing on the biomechanical loading on the upper extremity. Six subjects typed in phone numbers using their right hand on a stand-alone numeric keypad in three conditions: (1) typing using the index finger; (2) typing using the index and the middle fingers; (3) typing using the index, middle and ring fingers. Typing with...
Musculoskeletal disorders associated with computer use span the joints of the upper extremity. Computing typically involves tapping in multiple directions. Thus, we sought to describe the loading on the finger, wrist, elbow and shoulder joints in terms of kinematic and kinetic difference across single key switch tapping to directional tapping on multiple keys. An experiment with repeated measures...
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