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Modelling relative masseter force from surface electromyograms during mastication in non-human primates

W L Hylander1, K R Johnson

  • 1Department of Biological Anthropology and Anatomy, Duke University Medical School, Durham, NC 27710.

Archives of Oral Biology
|March 1, 1993
PubMed
Summary

This study analyzed masseter electromyograms (EMGs) and force during chewing. Findings provide a basis for modeling jaw muscle force using EMGs during near-isometric contractions.

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Physiology

Background:

  • Understanding the relationship between muscle electrical activity and force is crucial for biomechanical modeling.
  • Mastication involves complex jaw muscle coordination and force generation.

Purpose of the Study:

  • To analyze the relationship between masseter electromyograms (EMGs) and relative masseter force during the power stroke of mastication.
  • To determine an optimal time constant for EMG analysis to best mimic muscle force.

Main Methods:

  • Recorded masseter EMGs using bipolar surface electrodes in macaques and baboons.
  • Estimated relative masseter force by measuring surface bone strain on the zygomatic arch.
  • Quantified EMGs using root-mean-square (r.m.s.) analysis with varying time constants.

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Main Results:

  • The optimal time constant for EMG analysis varied between subjects (35-72 ms, median 42 ms).
  • Using a 42-ms time constant yielded an average latency of ~30 ms between EMG and force.
  • Established an empirical basis for modeling relative jaw-muscle force from EMGs.

Conclusions:

  • Surface EMGs can be used to model relative jaw-muscle force during near-isometric contractions.
  • The findings offer insights into the neuromuscular control of mastication.
  • This approach provides a foundational method for future biomechanical studies of jaw function.