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Respiratory function changes in a wilderness multisport endurance competition: a prospective case study.

Ian R Rogers1, Dale Speedy, David Hillman

  • 1Department of Emergency Medicine, Sir Charles Gairdner Hospital, Perth, Australia. ian.rogers@health.wa.gov.au

Wilderness & Environmental Medicine
|July 3, 2002
PubMed
Summary

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Ultra endurance multisport athletes experience significant respiratory changes during competition, including decreased lung function and potential airflow obstruction. These effects were observed even without symptoms and were not prevented by medication.

Area of Science:

  • Sports Medicine
  • Pulmonary Physiology
  • Endurance Sports Research

Background:

  • Wilderness multisport endurance competitions present unique physiological challenges.
  • Understanding respiratory function changes in ultra-endurance athletes is crucial for performance and health.
  • Previous research has not extensively documented serial respiratory changes during such events.

Observation:

  • A prospective observational case study followed a single athlete over two years during a 105 km wilderness multisport endurance competition.
  • Respiratory function (FEV1, FVC, flow volume loops, oxygen saturation) was measured serially during the event.
  • Nedocromil prophylaxis was administered during the second year to assess its impact.

Findings:

  • Significant decreases in forced expiratory volume in 1 second (FEV1) (up to 25%) and forced vital capacity (FVC) (up to 22%) were observed post-race.

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  • A pattern consistent with evolving airflow obstruction was noted, despite normal baseline tests.
  • Oxygen saturation decreased to a minimum of 92%, and nedocromil did not prevent these respiratory changes.

    • Implications:

    • Ultra-endurance multisport events can induce substantial, potentially obstructive, changes in respiratory function.
    • These findings highlight the significant physiological stress placed on the respiratory system during extreme endurance activities.
    • Further research is warranted to explore the mechanisms and long-term consequences of exercise-induced respiratory changes in athletes.