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Fatigue01:21

Fatigue

Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...

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Related Experiment Video

Updated: Jun 18, 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

A mechanomyographic frequency-based fatigue threshold test.

C Russell Hendrix1, Terry J Housh, Jorge M Zuniga

  • 1Department of Nutrition and Health Sciences, Human Performance Laboratory, 110 Ruth Leverton Hall, University of Nebraska-Lincoln, Lincoln, NE 68583-0806, United States. rhendri7@unlserve.unl.edu

Journal of Neuroscience Methods
|December 1, 2009
PubMed
Summary
This summary is machine-generated.

The mechanomyographic mean power frequency fatigue threshold (MMG MPF(FT)) estimates maximal isometric torque without motor unit firing rate changes. This non-invasive test shows potential for evaluating interventions affecting muscle fatigue.

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Motor Control

Background:

  • The mechanomyographic (MMG) mean power frequency fatigue threshold (MMG MPF(FT)) theoretically defines the maximal isometric torque sustainable without altering motor unit firing rates.
  • Electromyography (EMG) signal analysis has been used to estimate fatigue thresholds.

Purpose of the Study:

  • To assess the applicability of a mathematical model for estimating the electromyographic (EMG) MPF(FT) to the MMG signal for a novel MMG MPF(FT).
  • To compare mean torque levels derived from the MMG MPF(FT) test across vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF) muscles during isometric leg extension.

Main Methods:

  • Nine healthy adults (4 men, 5 women; mean age 21.6 years) underwent fatiguing isometric leg extension actions at 30-75% of maximum voluntary isometric contraction (MVIC).
  • Surface MMG signals were recorded from VL, VM, and RF muscles.
  • MMG MPF(FT) was determined as the y-intercept of the isometric torque versus MMG MPF (slope coefficient) over time plot.

Main Results:

  • No significant differences were found in MMG MPF(FT) values among the VL (34.8±23.4 Nm), VM (32.1±16.1 Nm), and RF (31.6±15.2 Nm) muscles.

Conclusions:

  • The MMG MPF(FT) test offers a potential non-invasive method for assessing changes in global motor unit firing rates during isometric contractions.
  • This method could be valuable for evaluating the impact of various interventions on muscle fatigue and performance.