Muscle Fatigue Clinical Trial
Official title:
Trapezius Muscle Fatigue of Long Duration: a Likely Neuromuscular Control Issue
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.
30 healthy adults without chronic neck pain participated in a laboratory study designed to
simulate two full workdays of computer work. Within each session, participants performed five
50-min working activities separated by 10-min breaks: i) Use a computer keyboard to type a
text presented on the left side of the screen; ii) do the typing task with the desk height
set10 cm above elbow height; iii) play the computer game Spider Solitaire implemented in
Windows 10; iv) Stroop test (This test consists of reading the name of a color whose text is
in a color different from the name. The color name was then selected from a multiple-choice
panel displaying color names; v) the same online puzzle game was presented to all
participants. Assembling the puzzle was performed by drag and drop actions. The work periods
were not disrupted (on the "control day") whereas two short interruptions of 5-min were
introduced at 1/3 and 2/3 of each working period on the "intervention day". During these
interruptions, participants were asked to perform "muscle disrupting/relaxing" activities.
For each experimental session a 30-min lunch break took place between the third and the
fourth work periods. The specific sequence of work activity type and disrupting/relaxing
activities was randomized across participants; however, for each participant the order of
work activities remained the same for the two experimental sessions (control and intervention
days). The order of control and intervention days was also randomized between participants.
A set of six measures were performed at specific time intervals during each experiment:
before the first work activity, before and after lunch, immediately and 1 hour after the
fifth (last) work activity: i) upper trapezius activation, assessed through the temporal EMG
profile recorded by a single bipolar signal; and ii) through the spatio-temporal distribution
of EMG activity detected by a 2D array of electrodes (64 channels); iii) muscle fatigue,
quantified by changes in electrically induced muscle twitch force signals, iv) isometric
performance, v) dynamic performance; iii) cognitive and physical load and stress level. In
addition, personality traits (anxiety level), perceived workload and musculoskeletal symptoms
were evaluated as covariates.
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