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Updated: Jun 10, 2026

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test
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Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test

Published on: July 27, 2015

Changes in paraspinal electromyographic spectral analysis with exercise: Two studies.

D A Thompson1, H J Biedermann, J M Stevenson

  • 1Department of Psychology, Queen's University, Kingston, Canada.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|August 20, 2010
PubMed
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Electromyographic (EMG) power spectrum (PS) analysis shows promise for evaluating low back pain treatment. This method detected adaptive changes in paraspinal muscles after exercise interventions in both healthy individuals and those with low back pain.

Area of Science:

  • Biomechanics
  • Neuromuscular Physiology
  • Rehabilitation Science

Background:

  • Electromyographic (EMG) power spectrum (PS) analysis is a potential tool for assessing paraspinal muscle adaptations.
  • Its efficacy in evaluating low back pain (LBP) treatment outcomes requires substantiation.

Purpose of the Study:

  • To investigate the utility of EMG PS analysis in measuring paraspinal muscle adaptations.
  • To assess changes in multifidus and iliocostalis muscles following exercise interventions.

Main Methods:

  • Two studies were conducted: one with sedentary healthy women in a fitness program, and another with LBP sufferers in a back-care program.
  • Subjects underwent physical fitness assessments and EMG PS analysis of paraspinal muscles before and after a 10-12 week intervention.

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Last Updated: Jun 10, 2026

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  • EMG PS analysis focused on initial median frequency (IMF) and fatigue (FTG) parameters.

    • Main Results:

    • EMG PS measures were sensitive to adaptive changes in paraspinal muscles.
    • Fitness class participants showed decreased multifidus IMF and FTG.
    • Back-care participants exhibited increased multifidus IMF and decreased multifidus and iliocostalis FTG.

    Conclusions:

    • EMG PS analysis can detect adaptive changes in paraspinal muscles in response to exercise.
    • Findings suggest potential links between spectral changes and muscle fiber characteristics.
    • Further research is needed to validate these links and the clinical application of EMG PS analysis for LBP treatment evaluation.