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Fatigue01:21

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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...
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Updated: Feb 14, 2026

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test
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Reduced Electromyographic Fatigue Threshold After Performing a Cognitive Fatiguing Task.

Justine R Ferris1,2, Mary A Tomlinson1,2, Tayler N Ward1,2

  • 1Physical Therapy Program, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, Michigan; and.

Journal of Strength and Conditioning Research
|February 27, 2018
PubMed
Summary
This summary is machine-generated.

Cognitive fatigue tasks significantly reduce the electromyographic fatigue threshold (EMGFT) and maximal heart rate during exercise. This suggests mental exertion can impair physical performance capacity.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Cognitive Neuroscience

Background:

  • Cognitive fatigue may impact exercise capacity.
  • The electromyographic fatigue threshold (EMGFT) quantifies exercise intensity limits.
  • No prior studies investigated cognitive fatigue's effect on EMGFT estimation.

Purpose of the Study:

  • To determine if cognitive fatigue, induced by a demanding task, reduces the estimated EMGFT.
  • To assess the impact of mental exertion on physiological responses during exercise.

Main Methods:

  • Eight healthy men underwent two conditions: a 60-minute cognitive fatigue task (AX continuous performance test) or a control (watching a video).
  • Following each condition, participants performed an incremental single-leg knee-extensor test with electromyography (EMG) and heart rate monitoring.
  • The EMGFT was calculated and compared between conditions using a paired samples t-test.

Main Results:

  • Maximal power output did not differ significantly between conditions.
  • A significant decrease in EMGFT was observed after the cognitive fatigue task (31 ± 3 W) compared to the control (24 ± 2 W).
  • Maximal heart rate was significantly lower following the cognitive fatigue task (151 ± 5 bpm) versus the control (132 ± 6 bpm).

Conclusions:

  • Performing a cognitive fatiguing task prior to exercise significantly reduces the electromyographic fatigue threshold.
  • Cognitive fatigue also leads to a reduction in the maximal heart rate response during exercise.
  • Mental exertion can impair physiological markers of exercise capacity.