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Sex differences in surface EMG interference pattern power spectrum

R Cioni1, F Giannini, C Paradiso

  • 1Institute for Nervous and Mental Diseases, University of Siena, Italy.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|November 1, 1994
PubMed
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Sex differences were observed in muscle activity, with women showing lower median power frequency in surface electromyography (EMG) during contractions. These spectral parameter variations between sexes may stem from anatomical differences.

Area of Science:

  • Physiology
  • Biomedical Engineering

Background:

  • Surface electromyography (EMG) spectral analysis is crucial for understanding muscle fatigue and activation.
  • Investigating sex-based differences in neuromuscular function can reveal important physiological variations.

Purpose of the Study:

  • To examine sex differences in surface electromyogram (EMG) spectral parameters during voluntary muscle contractions.
  • To assess the impact of unipolar versus bipolar electrode configurations on these parameters.

Main Methods:

  • 15 healthy males and 15 healthy females performed voluntary muscle contractions of varying intensities.
  • Surface EMG signals were recorded using both unipolar and bipolar electrode leads.
  • Analysis focused on spectral parameters, including median power frequency and root mean square amplitude.

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Main Results:

  • The relationship between EMG amplitude (root mean square) and developed force was non-linear.
  • Mean median power frequency values were significantly lower in females compared to males.
  • Median power frequency increased progressively with force in both sexes, irrespective of lead type.

Conclusions:

  • Significant sex differences exist in EMG spectral parameters, likely attributable to anatomical variations.
  • Electrode type (unipolar vs. bipolar) did not alter the observed sex-specific trends in spectral parameters.