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Physiological responses at the fatigue threshold.

T J Housh1, G O Johnson, S L McDowell

  • 1Center for Youth Fitness and Sports Research, University of Nebraska-Lincoln.

International Journal of Sports Medicine
|June 1, 1991
PubMed
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The fatigue threshold (FT) in runners is very close to maximal effort and cannot be sustained long. This study questions the FT

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • The fatigue threshold (FT) is a physiological marker used in endurance sports.
  • Understanding the sustainability of the FT is crucial for training and performance.
  • Previous research has explored various physiological responses at the FT.

Purpose of the Study:

  • To determine oxygen consumption, heart rate, and plasma lactate responses at the FT.
  • To estimate the duration the FT can be maintained in adult males.
  • To assess the validity of the FT as a measure of sustainable maximal running velocity.

Main Methods:

  • Ten adult males performed maximal treadmill tests and FT tests.
  • Measurements included oxygen consumption (VO2), heart rate, and plasma lactate.

Related Experiment Videos

  • Data were analyzed to compare responses at FT and maximal effort.

    • Main Results:

    • The FT (14.0 km/hr, 197 bpm, 47.5 ml/kg/min, 5.4 mM lactate) was similar to maximal effort.
    • Maximal effort (VO2max) values were 14.4 km/hr, 203 bpm, 49.5 ml/kg/min, 7.4 mM lactate.
    • The FT could only be maintained for 0.16 to 0.28 hours.

    Conclusions:

    • The fatigue threshold is physiologically very close to maximal exertion.
    • The FT cannot be sustained for extended periods without exhaustion.
    • Findings do not support the FT's validity as a measure of sustainable maximal running velocity.