title: Does living in a cold climate or recreational skiing increase the risk for obstructive respiratory diseases or symptoms?
abstract: OBJECTIVE
  Respiratory symptoms and obstructive pulmonary diseases experienced during exercise and in cold weather were analysed in a large postal questionnaire study of a general adult population living in a cold climate. The aim of this study was to assess the prevalence of shortness of breath (SOB) during exercise, or in cold weather, and to find out if the risks (odds ratio=OR) for asthma, chronic bronchitis, or SOB during exercise, or in cold weather, were affected by recreational cross-country skiing, or by outdoor work in a cold climate.
  
  
  RESULTS
  Of the 7937 invited persons, 84% responded; 876 of them were outdoor workers and 1497 were recreational cross-country skiers. Of the non-smoking responders, asthmatic subjects had the highest prevalence of SOB during exercise in cold weather (78%-82%), but allergic and bronchitic persons also had significantly higher prevalence rates (22%-38% and 27%-59%, respectively) than healthy persons (10%-19%). In all categories, the prevalence of SOB was significantly higher among current smokers than among ex- or non-smokers. Risk factor analysis revealed increased risks for respiratory conditions among those who had a family history of obstructive airway disease, or allergy. Skiers did not have a significantly increased risk for asthma, or respiratory symptoms. Among outdoor workers the risk for SOB during exercise in cold weather, OR 1.23 (CI 1.03-1.47), and for chronic bronchitis, OR 1.77 (CI 1.21-2.60), was higher than among indoor workers.
  
  
  CONCLUSIONS
  In conclusion, the risk for chronic bronchitis and bronchitic symptoms was elevated among outdoor workers, but not among regular recreational cross-country skiers, and the risk for asthma was not significantly elevated by regular exercising, or by working in a cold climate.
authors.affiliation: Department of Pulmonary Medicine, Päijät-Häme Central Hospital, Lahti, Finland. jyrki.kotaniemi@phks.fi
authors.forename: Jyrki-Tapani
authors.initials: JT
authors.lastname: Kotaniemi
authors.forename: Jari
authors.initials: J
authors.lastname: Latvala
authors.forename: Bo
authors.initials: B
authors.lastname: Lundbäck
authors.forename: Anssi
authors.initials: A
authors.lastname: Sovijärvi
authors.forename: Juhani
authors.initials: J
authors.lastname: Hassi
authors.forename: Kjell
authors.initials: K
authors.lastname: Larsson
mesh_terms: D000328:Adult; D003081:Cold Climate; D004417:Dyspnea / Q000453:epidemiology / Q000209:etiology; D005260:Female; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000453:epidemiology / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D005082:Physical Exertion; D012307:Risk Factors; D012865:Skiing