This study is expected to demonstrate that during experimental days of seated computer work sustained and focalized low-level muscle activity contributes to the development of long-lasting fatigue effects (and thus possible disorder). On days with and without frequent interruptions, signs of fatigue and the activity pattern of the trapeze muscle are registered and compared using electromyographic registrations of the trapezius muscle.
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EMG profile recorded by a single bipolar electrode: Rest-time
Timeframe: Continuously from the beginning to 370 min (end) of the simulated working activity of both the control and intervention day
Spatio-temporal distribution of EMG activity: Area of muscle activity
Timeframe: Continuously from the beginning to 370 min (end) of the simulated working activity of both the control and intervention day
Muscle fatigue: Change of muscle twitch
Timeframe: Change between 30 min before the beginning of the simulated working activity and 30 min after the end of the simulated working activity of both the control and intervention day
Muscle fatigue: Change of dynamic force control accuracy
Timeframe: Change between 30 min before the beginning of the simulated working activity and 30 min after the end of the simulated working activity of both the control and intervention day