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BMJ. 1993 November 20; 307(6915): 1326–1329.
PMCID: PMC1679468

High prevalence of asthma in cross country skiers.


OBJECTIVES--To study the prevalence of asthma (asthma symptoms and bronchial hyperresponsiveness) in Swedish cross country skiers compared with non-skiers and monitor changes in symptoms and bronchial hyperresponsiveness during the year. DESIGN--Cross sectional study during the winter ski season and in the summer. SETTING--Six ski clubs for élite skiers (total 47) in two different areas of Sweden. SUBJECTS--42 élite cross country skiers and 29 non-skiing referents. MAIN OUTCOME MEASURES--Bronchial responsiveness, asthma symptoms, and lung function. RESULTS--Bronchial responsiveness was significantly greater and asthma symptoms more prevalent in the skiers than in the referents. There was no difference in bronchial responsiveness within either group between winter and summer. 15 of the 42 skiers used antiasthmatic drugs regularly and 23 had a combination of asthma symptoms and hyperresponsive airways or physician diagnosed asthma, or both. Altogether 33 skiers had symptoms of asthma or bronchial hyperresponsiveness. One of the referents had symptoms of asthma and bronchial hyperresponsiveness, and none used antiasthmatic drugs regularly. CONCLUSIONS--Asthma, asthma-like symptoms, and bronchial hyperresponsiveness are much more common in cross country skiers than in the general population and non-skiers. Strenuous exercise at low temperatures entailing breathing large volumes of cold air is the most probable explanation of persistent asthma in skiers.

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