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Related Experiment Video

Updated: May 14, 2026

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test
06:00

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test

Published on: July 27, 2015

Electromyographic study in 5 muscles during an isometric fatiguing protocol.

Larissa Di Oliveira Santhome1, Luciana Roberta Tenorio Peixoto, Claudia Mendes Guimaraes

  • 1School of Medicine of the University of Brasília, Brasília, DF, Brazil. fisiolarisadi@gmail.com

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|February 1, 2013
PubMed
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This study investigated muscle fatigue during isometric elbow flexion in healthy men. Electromyographic median frequency (MDF) decreased in all tested muscles, indicating fatigue in both agonist and antagonist muscles.

Area of Science:

  • Exercise Physiology
  • Biomedical Engineering
  • Neuromuscular Physiology

Background:

  • Muscle fatigue is a complex physiological response impacting physical performance.
  • Electromyography (EMG) is crucial for assessing neuromuscular activity.
  • Median Frequency (MDF) of EMG signals is a common indicator of muscle fatigue.

Purpose of the Study:

  • To investigate the electromyographic median frequency (MDF) changes in various elbow flexor and extensor muscles during isometric resistance to fatigue.
  • To determine if fatigue affects agonist and antagonist muscles during isometric contractions at different joint angles.

Main Methods:

  • 12 healthy young men performed isometric elbow flexion to fatigue at 45°, 90°, and 135°.
  • Electromyographic (EMG) data were recorded from Biceps Brachialis Long Head (BBL), Brachioradialis (BRD), Flexor Digitorum Superficialis (FDS), Triceps Brachialis Long Head (TBL), and Extensor Digitorum (ED).

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  • Median Frequency (MDF) of the EMG signal was analyzed to assess muscle fatigue.

    • Main Results:

    • A significant decrease in MDF was observed across all measured muscles, indicating the onset of muscle fatigue.
    • This reduction in MDF occurred in both the primary (agonist) and opposing (antagonist) muscles involved in the elbow flexion task.
    • Fatigue effects, as indicated by MDF decrease, were present at all tested joint angles (45°, 90°, 135°).

    Conclusions:

    • Isometric resistance exercise to fatigue leads to a reduction in EMG MDF in both agonist and antagonist muscles.
    • The findings suggest that neuromuscular fatigue affects the entire muscle group around the elbow joint during isometric contractions.
    • EMG MDF is a reliable indicator for detecting fatigue in multiple muscle groups during resistance exercises.