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Changes in respiratory function during a wilderness multisport endurance competition.

I R Rogers¹, S Inglis, D Speedy

¹Department of Emergency Medicine, Sir Charles Gairdner Hospital, Perth, Australia.

Wilderness & Environmental Medicine

|April 11, 2001

Summary

Wilderness endurance athletes experienced significant declines in respiratory function, including forced expiratory volume in 1 second (FEV1) and forced vital capacity (FVC), during a multisport event. These changes were not observed in control subjects, highlighting potential impacts of extreme exertion.

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Area of Science:

Sports Medicine
Pulmonary Physiology
Environmental Health

Background:

Wilderness multisport endurance events present unique physiological challenges.
Understanding respiratory function changes during such events is crucial for athlete health and performance.

Purpose of the Study:

To document changes in respiratory function (FEV1 and FVC) in competitors during a wilderness multisport endurance event.
To compare respiratory function changes in athletes versus a control group.

Main Methods:

Prospective observational cohort study design.
Measurement of forced expiratory volume in 1 second (FEV1) and forced vital capacity (FVC) at baseline, midrace, and end of race.
Inclusion of 25 competitors in a 105-km ski/run/cycle/paddle race and 9 control subjects.

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Main Results:

Mean decline in FEV1 was 15.1% and FVC was 13.0% among competitors.
56% of subjects showed a >10% decline in FEV1 and FVC; 28% showed a >20% decline.
No significant changes in FEV1 or FVC were observed in the control group.

Conclusions:

Significant declines in FEV1 and FVC are common during wilderness multisport endurance events.
The etiology of these respiratory changes requires further investigation.