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Related Experiment Videos

Does lung function limit performance in a 24-hour ultramarathon?

G L Warren1, K J Cureton, P B Sparling

  • 1Department of Physical Education, University of Georgia, Athens 30602.

Respiration Physiology
|November 1, 1989
PubMed
Summary
This summary is machine-generated.

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Ventilatory muscle fatigue may slow runners in ultramarathons. Reduced maximum voluntary ventilation (MVV12) significantly correlated with decreased running speed during a 24-hour race.

Area of Science:

  • Exercise Physiology
  • Sports Medicine
  • Respiratory Physiology

Background:

  • Marathon and ultramarathon running can lead to impaired lung function.
  • Performance decline in prolonged running events suggests potential physiological limitations.

Purpose of the Study:

  • To investigate if ventilatory muscle fatigue contributes to the decline in running speed during a 24-hour ultramarathon.
  • To test the hypothesis that reduced ventilatory muscle endurance limits performance in extreme endurance events.

Main Methods:

  • Ten competitors in a 24-hour ultramarathon underwent pulmonary function tests every 3 hours.
  • Tests included inspiratory capacity, peak flow, forced vital capacity, forced expiratory volume in 1 sec, maximum voluntary ventilation for 12 sec (MVV12), and maximal respiratory pressures.

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  • Running speed was averaged over 3-hour intervals.

    • Main Results:

    • Maximum voluntary ventilation for 12 sec (MVV12) significantly decreased by 17% after 24 hours of running.
    • While other ventilatory measures showed a trend of decrease, changes were not statistically significant.
    • After adjusting for running speed differences, MVV12 explained 39% of the variance in running speed (P < 0.0001).

    Conclusions:

    • A decrease in ventilatory muscle endurance, specifically MVV12, may be a limiting factor for running speed in prolonged ultramarathon running.
    • Findings suggest that ventilatory muscle fatigue plays a role in performance decrements during extreme endurance events.