Document Detail

Bronchial hyperresponsiveness, airway inflammation, and airflow limitation in endurance athletes.
MedLine Citation:
PMID:  15947305     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Whereas a high prevalence of bronchial abnormalities has been reported in endurance athletes, its underlying mechanisms and consequences during exercise are still unclear. STUDY OBJECTIVES: The purpose of this study was to assess the following: (1) bronchial responsiveness to methacholine and to exercise; (2) airway inflammation; and (3) airflow limitation during intense exercise in endurance athletes with respiratory symptoms. DESIGN: Cross-sectional observational study. SETTING: Lung function and exercise laboratory at a university hospital. PATIENTS AND MEASUREMENTS: Thirty-nine endurance athletes and 13 sedentary control subjects were explored for the following: (1) self-reported respiratory symptoms; (2) bronchial hyperresponsiveness (BHR) to methacholine and exercise; (3) airflow limitation during intense exercise; and (4) bronchial inflammation using induced sputum and nitric oxide (NO) exhalation. RESULTS: Fifteen athletes (38%) showed BHR to methacholine and/or exercise in association with bronchial eosinophilia (mean [+/- SD] eosinophil count, 4.1 +/- 8.5% vs 0.3 +/- 0.9% vs 0%, respectively), higher NO concentrations (19 +/- 10 vs 14 +/- 4 vs 13 +/- 4 parts per billion, respectively), a higher prevalence of atopy, and more exercise-induced symptoms compared with non-hyperresponsive athletes and control subjects (p < 0.05). Furthermore, airflow limitation during intense exercise was observed in eight athletes, among whom five had BHR. Athletes with airflow limitation reported more symptoms and had FEV1, FEV1/FVC ratio, and forced expiratory flow at midexpiratory phase values of 14%, 9%, and 29%, respectively, lower compared with those of nonlimited athletes (p < 0.05). CONCLUSION: BHR in endurance athletes was associated with the criteria of eosinophilic airway inflammation and atopy, whereas airflow limitation during exercise was primarily a consequence of decreased resting spirometric values. Both BHR and bronchial obstruction at rest with subsequent expiratory flow limitation during exercise may promote respiratory symptoms during exercise in athletes.
Samuel Vergès; Gilles Devouassoux; Patrice Flore; Eliane Rossini; Michèle Fior-Gozlan; Patrick Levy; Bernard Wuyam
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Chest     Volume:  127     ISSN:  0012-3692     ISO Abbreviation:  Chest     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-06-10     Completed Date:  2005-07-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0231335     Medline TA:  Chest     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1935-41     Citation Subset:  AIM; IM    
HP2 Laboratory, Department of Medicine, CHU Grenoble, Joseph Fourier University, France.
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MeSH Terms
Airway Obstruction / diagnosis*,  epidemiology
Bronchial Hyperreactivity / diagnosis*,  epidemiology
Bronchial Provocation Tests
Bronchitis / diagnosis*,  epidemiology
Bronchoconstriction / physiology
Cross-Sectional Studies
Methacholine Chloride / diagnostic use
Physical Endurance
Reference Values
Respiratory Function Tests
Risk Assessment
Sports / physiology*
Statistics, Nonparametric
Reg. No./Substance:
62-51-1/Methacholine Chloride

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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