Cited by 217Asthma and respiratory diseasesOccupational exposure and asthmaRespiratory and Cough-Related Research

Effect of continuing or finishing high-level sports on airway inflammation, bronchial hyperresponsiveness, and asthma: A 5-year prospective follow-up study of 42 highly trained swimmers

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Helenius, Ilkka, Rytil[auml ], Paula, Sarna, Seppo, Lumme, Aki, Helenius, Miia, Remes, Ville, Haahtela, Tari·2002·Journal of Allergy and Clinical Immunology

Abstract

Background Mild eosinophilic airway inflammation and bronchial hyperresponsiveness-ie, mild asthma-have been shown to affect a high proportion of endurance athletes. The persistence of airway inflammation, bronchial hyperresponsiveness, and asthma in this population is not known, however, inasmuch as follow-up studies of athletes' asthma have not been performed. Objective The purpose of this study was to investigate effect of finishing high-level sports on airway inflammation, bronchial hyperresponsiveness, and asthma. Methods Forty-two elite competitive swimmers, most of them from the Finnish national team (37/42; 88%), were followed for 5 years in a prospective manner. All of the swimmers completed questionnaires and underwent resting spirometry, histamine challenge testing, and skin prick tests at baseline and at follow-up. Twenty-nine swimmers (69%) also gave induced sputum samples on both occasions. Sixteen (38%) of the swimmers had continued their competitive careers during follow-up (active swimmers), but 26 (62%) had stopped competing more than 3 months before the follow-up examination (past swimmers). Results Bronchial responsiveness was increased in 7 (44%) of the 16 active swimmers at baseline and in 8 (50%) of the 16 active swimmers at follow-up; it was increased in 8 (31%) of the 26 past swimmers at baseline and in 3 (12%) of the 26 past swimmers at follow-up (McNemar test, P =.025). The difference in the change in bronchial hyperresponsiveness between the study groups was significant (likelihood ratio test, P =.023). Current asthma (defined as bronchial hyperresponsiveness and exercise-induced bronchial symptoms monthly) was observed in 5 (31%) of the active swimmers at baseline and in 7 (44%) of the active swimmers at follow-up; of the past swimmers, it occurred in 6 (23%) at baseline and in 1 (4%) at follow-up (McNemar test, P =.025). The difference in the change in current asthma between the study groups was significant (likelihood ratio test, P =.0040). The sputum differential cell counts of eosinophils and lymphocytes increased significantly during the follow-up period in the active swimmers (Wilcoxon signed rank sum test; P =.033 and P =.0029, respectively); in the past swimmers, the sputum differential cell counts of eosinophils tended to decrease during the follow-up period (P =.17), whereas the differential cell counts of lymphocytes did not change significantly. The changes in the sputum differential cell counts of eosinophils between the study groups differed significantly (Mann-Whitney U test, P =.019). Conclusion In swimmers who had stopped high-level training, bronchial hyperresponsiveness and asthma attenuated or even disappeared. Mild eosinophilic airway inflammation was aggravated among highly trained swimmers who remained active during the 5-year follow-up. Our results suggest that athletes' asthma is partly reversible and that it may develop during and subside after an active sports career.

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Crossref · 10.1067/mai.2002.124769a

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Authors
Helenius, I., Rytil[auml ], P., Sarna, S., Lumme, A., Helenius, M., Remes, V., & Haahtela, T.
Affiliations
  • Helsinki University Hospital (FI)
  • University of Helsinki (FI)
Venue
Journal of Allergy and Clinical Immunology
Publisher
Elsevier BV
Published
2002-06
Volume
109
Issue
6
Pages
0962-0968
ISSN
0091-6749 (ISSN-L)
OpenAlex
W2165744221
Cited by
217
References
26
Citations by year
2026: 5 · 2025: 4 · 2024: 7 · 2023: 1 · 2022: 4 · 2021: 8 · 2020: 9 · 2019: 4 · 2018: 10 · 2017: 6 · 2016: 10 · 2015: 13 · 2014: 8 · 2013: 13 · 2012: 16
FWCI
2.86
Type
journal article
Language
en
Open access
Locations
  • Journal of Allergy and Clinical Immunology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Asthma and respiratory diseases
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Occupational exposure and asthma
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Respiratory and Cough-Related Research
Keywords
airway hyperresponsiveness, airway inflammation, elite swimmers, endurance athletes, eosinophilic airway inflammation, induced sputum, long-term follow-up, histamine challenge, asthma risk factors
MeSH terms
Adult, Asthma, Bronchial Provocation Tests, Female, Follow-Up Studies, Humans, Inflammation, Male, Physical Fitness, Prospective Studies, Skin Tests, Spirometry, Swimming, Bronchial Hyperreactivity

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