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The prevalence of airways hyperresponsiveness in members of an exercise training facility.
MedLine Citation:
PMID:  12870830     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Athletes have a high prevalence (11-50%) of exercise-induced asthma, which may be caused by the hyperventilation accompanying repetitive bouts of strenuous exercise. We hypothesized that recreational exercisers would display a similar trend. Eucapnic voluntary hyperventilation (EVH) bronchoprovocation (breathing 21% O2, 5% CO2, and 74% N2 at 60% of MVV for 5 minutes) was performed to determine the prevalence of airways hyperresponsiveness (AHR) in adults (n=212, 146 males, mean +/- standard deviation, age 32 +/- 10 years) who exercised regularly (10 +/- 10 years, 31 +/- 28% of their lives): none had a previous diagnosis of asthma. AHR was defined by at least a 10%, 20%, or 25% decline in FEV1, FEF(25-75), or PEFR, respectively, by spirometry at 1, 5, 10, and 15 minutes post-EVH. Forty-one of 212 (19%) tested positive for AHR: 20 of 41 (49%) were positive by FEV1, 28 of 41 (68%) by FEF(25-75), and 27 of 41 (66%) by PEFR. Comparing responders with nonresponders: pre-EVH lung function was equivalent, except for FEV1, which was reduced (p<0.05) in responders (96 +/- 13 vs. 102 +/- 12% predicted). Mean maximal negative deflections for responders were: for FEV1, -17 +/- 7%; FEF(25-75), -31 +/- 10%; PEFR, -38 +/- 11%. Ranges of decline for responders were: FEV1, -10 to -33%; FEF(25-75), -20 to -59%; PEFR, -25- to -70%. We conclude that in these regular exercisers, the prevalence of AHR is high and comparable with some athletic populations.
Authors:
Edward T Mannix; Melanie Roberts; Daniel P Fagin; Brandie Reid; Mark O Farber
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of asthma : official journal of the Association for the Care of Asthma     Volume:  40     ISSN:  0277-0903     ISO Abbreviation:  J Asthma     Publication Date:  2003 Jun 
Date Detail:
Created Date:  2003-07-21     Completed Date:  2003-08-26     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8106454     Medline TA:  J Asthma     Country:  United States    
Other Details:
Languages:  eng     Pagination:  349-55     Citation Subset:  IM    
Affiliation:
Division of Pulmonary, Allergy, Critical Care and Occupational Medicine, Department of Medicine, School of Medicine, Indiana University, Indianapolis, Indiana, USA. emannix@iupui.edu
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MeSH Terms
Descriptor/Qualifier:
Adult
Exercise / physiology*
Female
Humans
Male
Prevalence
Respiratory Function Tests
Respiratory Hypersensitivity / epidemiology*,  etiology

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