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Related Experiment Videos

Myofascial trigger point development from visual and postural stressors during computer work.

D Treaster1, W S Marras, D Burr

  • 1The Biodynamics Laboratory, The Ohio State University, 1971 Neil Ave, 210 Baker Systems, Columbus, OH 43210, USA.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|September 9, 2005
PubMed
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Computer work may cause trapezius muscle pain. High visual stress, not postural stress, was linked to trigger point development and increased pain sensitivity in a study on female computer users.

Area of Science:

  • Ergonomics
  • Pain Medicine
  • Occupational Health

Background:

  • Musculoskeletal pain from low-level static exertions during computer work is not well understood.
  • Myofascial pain may develop from trigger points in the trapezius muscles due to static postural and visual stress.
  • Understanding these mechanisms is crucial for preventing occupational pain.

Purpose of the Study:

  • To investigate the hypothesis that static postural and visual stress during computer use contribute to trapezius muscle trigger point development.
  • To examine the relationship between visual and postural stress levels and the onset of myofascial pain.
  • To identify specific stress conditions that exacerbate trigger point sensitivity.

Main Methods:

  • A study involving 16 female subjects using computers under controlled high and low postural and visual stress conditions.

Related Experiment Videos

  • Monitoring trigger point development using expert assessment, subject self-reports, and electromyographic (EMG) activity.
  • Analyzing cyclic trends in the median frequency of EMG signals in the trapezius muscles.

    • Main Results:

    • High visual stress conditions significantly increased trigger point sensitivity, as reported by subjects and specialists.
    • Electromyographic analysis revealed significant differences in trapezius muscle activity patterns between stress conditions, particularly in the right trapezius.
    • Fewer EMG signal cycles were observed under high visual and low postural stress compared to other conditions.

    Conclusions:

    • High visual stress appears to be a significant factor in the development of myofascial pain responses during computer work.
    • Visual stress may play a more critical role than postural stress in trapezius muscle trigger point sensitivity.
    • Findings suggest targeted interventions focusing on visual stress reduction may help mitigate occupational musculoskeletal pain.