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Evaluating protocols for normalizing forearm electromyograms during power grip.

Binh P T Ngo1, Richard P Wells1

  • 1Department of Kinesiology, University of Waterloo, 200 University Ave. W, Waterloo N2L 3G1, Canada.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|November 22, 2015
PubMed
Summary
This summary is machine-generated.

Resisted moment tasks yield higher forearm muscle electrical activity than standard grip tasks for normalizing electromyography (EMG) signals. Researchers should use these tasks for more accurate EMG amplitude estimates in power gripping studies.

Keywords:
ElectromyographyForearmMaximum voluntary electrical activationsNormalization

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Movement Science

Background:

  • Electromyography (EMG) signal amplitude normalization is crucial for forearm muscle activity analysis.
  • Current protocols for normalizing EMG during power grip tasks lack standardization.
  • A common reference task involves isometric maximum voluntary power grip in a mid-pronated forearm posture.

Purpose of the Study:

  • To investigate optimal tasks for normalizing forearm EMG signal amplitude.
  • To compare EMG activity during various maximal voluntary efforts against a standard reference task.
  • To provide guidance on recommended protocols for forearm EMG normalization.

Main Methods:

  • Examined EMG amplitude of six forearm muscles (three flexors, three extensors).
  • Assessed 16 participants (8 male, 8 female, aged 18-26).
  • Compared EMG during twenty maximal voluntary efforts (postures, force/moment exertions) to a standard grip force reference task.

Main Results:

  • Maximal muscle activity was observed during resisted moment tasks.
  • Resisted moment tasks produced EMG activity up to 2.8 times higher than the reference task (p<0.05).
  • Resisted flexor and extensor moment tasks yielded comparable or higher EMG activity than the reference task for respective muscle groups.

Conclusions:

  • Resisted moment tasks are superior to the standard grip task for normalizing forearm EMG.
  • These tasks provide better estimates of maximum electrical activation magnitudes for forearm muscles.
  • Recommends resisted flexor and extensor moment tasks for EMG normalization in power gripping studies.