Typing keystroke duration changed after submaximal isometric finger exercises |
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Authors: | Joe Chang Che-Hsu Johnson Peter W Katz Jeffrey N Eisen Ellen A Dennerlein Jack T |
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Institution: | Department of Environmental Health, Harvard School of Public Health, 665 Huntington Avenue, Boston, MA, 02115, USA. chjchang@gmail.com |
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Abstract: | A repeated-measures laboratory experiment tested whether keystroke duration during touch-typing changes after a finger performs
submaximal isometric flexion exercises. Fourteen right-handed touch-typists used right ring finger to perform three 15-min
exercise conditions, two isometric exercises and a no-force condition, each on a separate day. Before and after each exercise
condition, typing keystroke duration and isometric force elicited by electrical stimulation were measured for right ring finger.
Keystroke duration of right ring finger decreased by 5% (6 ms, P < 0.05) immediately after the exercises but not after the no-force condition. Peak isometric finger force elicited by electrical
stimulation decreased by 17–26% (P < 0.05) for the flexor digitorum superficialis and decreased by 4–8% for the extensor digitorum communis after the isometric
exercises. After the finger was exposed to isometric exercises, changes in typing keystroke duration coincided with changes
in the physiological state of the finger flexor and extensor muscles. |
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Keywords: | Computer use Muscle physiology Fatigue Musculoskeletal disorders Exposure assessment |
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