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Related Experiment Videos

Normalization of electromyogram in the neck-shoulder region

H Nieminen1, E P Takala, E Viikari-Juntura

  • 1Institute of Occupational Health, Department of Physiology, Helsinki, Finland.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1993
PubMed
Summary

Comparing electromyogram (EMG) normalization methods, this study found that arm posture affects muscle activity during simulated work. Normalizing EMG in a middle arm position is acceptable for these tasks.

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Occupational Health

Background:

  • Electromyogram (EMG) normalization is crucial for comparing muscle activity across individuals and tasks.
  • Different normalization methods exist, including linear and curvilinear approaches, with varying impacts on results.
  • Understanding the influence of arm posture on EMG normalization is important for accurate assessment in occupational settings.

Purpose of the Study:

  • To compare linear and curvilinear EMG normalization methods in healthy men during a simulated work task.
  • To investigate the effect of arm posture on the relationship between shoulder load moment and EMG activity.
  • To evaluate the repeatability and acceptability of EMG normalization techniques under varying conditions.

Main Methods:

Related Experiment Videos

  • Ten healthy men performed a simulated work task ('Solitaire test') involving arm holding and attention.
  • Maximal voluntary contractions (MVC) and gradually increasing contractions were used for normalization.
  • EMG activity was recorded from shoulder muscles (supraspinatus, infraspinatus, trapezius, deltoid, pectoralis major) in various arm postures.
  • Shoulder load moment was calculated using a 2D model for flexion tests.

    • Main Results:

    • Differences up to 30% in normalized EMG values were observed between linear and curvilinear methods.
    • Short-term repeatability of normalization using gradually increasing contractions was good.
    • Arm posture significantly affected the EMG-load moment relationship for all studied muscles.
    • Arm posture did not significantly alter amplitude probability distribution functions during the work task.

    Conclusions:

    • Linear and curvilinear EMG normalization methods yield different results.
    • Normalization in a middle arm position is acceptable for the simulated work tasks studied.
    • Arm posture is a significant factor influencing EMG-load moment relationships, necessitating careful consideration in analysis.