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Related Experiment Video

Updated: Jun 19, 2026

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test

Published on: July 27, 2015

Association between the electromyographic fatigue threshold and ventilatory threshold.

T V Camata¹, T R Lacerda, L R Altimari

¹GEPESINE - Group of Study and Research in Neuromuscular System and Exercise, CEFE - State University of Londrina (UEL), PR, Brazil.

Electromyography and Clinical Neurophysiology

|October 23, 2009

Summary

This study found that the electromyographic fatigue threshold (EMGth) closely aligns with the ventilatory threshold (Vth) during incremental cycling tests. Shorter time windows, specifically 5 and 10 seconds, are recommended for calculating EMGth from RMS signals for better accuracy.

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Area of Science:

Exercise Physiology
Sports Science
Biomedical Engineering

Background:

The electromyographic fatigue threshold (EMGth) and ventilatory threshold (Vth) are key indicators of exercise intensity.
Determining the precise relationship and optimal calculation methods for EMGth is crucial for performance analysis.

Purpose of the Study:

To verify the coincidence between EMGth and Vth during incremental cycling tests.
To compare the accuracy of Root Mean Square (RMS) calculations for EMGth using different time windows.

Main Methods:

Thirteen male cyclists performed ramp incremental tests on a cycle simulator.
EMG data from quadriceps femoris muscles were collected.
Statistical analyses included t-tests, Pearson's correlation, and Bland-Altman analysis.

Main Results:

No significant differences were observed between Vth and EMGth across various RMS calculation time windows (2, 5, 10, 30, 60 seconds).
EMGth calculated using 5 and 10-second RMS windows showed better appropriateness for visual inspection and determination.

Conclusions:

EMGth and Vth demonstrate strong concordance during incremental exercise in cyclists.
Employing 5 and 10-second windows for RMS calculation is recommended for reliable EMGth determination.