Laboratory and experimental evidence exists suggesting associations between muscle fatigue and injuries ( Mair et al. In previous studies, muscle fatigue is the most frequently discussed physiological change in that the factors associated with muscle fatigue are similar to those associated with injuries ( Dennerlein et al. Researchers have been studying the physiological changes in muscles in hope for understanding cumulative exposure and constructing the underlying exposure–response relationship. 1998), but the exposure–response relationship and injury mechanism are not yet well understood. 2007 Faucett and Rempel 1994 Matias et al. 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.Ĭomputer-related musculoskeletal disorders (MSDs) are of growing concern ( Bergqvist et al. 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. 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. Before and after each exercise condition, typing keystroke duration and isometric force elicited by electrical stimulation were measured for right ring finger. 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. A repeated-measures laboratory experiment tested whether keystroke duration during touch-typing changes after a finger performs submaximal isometric flexion exercises.
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