title: Exercise-induced asthma in asthmatic children of southern Iran.
abstract: BACKGROUND
  Asthma is a common illness, especially among children. Exercise-induced asthma is an important consideration, both as a factor, limiting physical activity of patients, and also as an indicator of poor long term control. We investigated pre-Valence of exercise-induced asthma in a group of asthmatic children living in southern Iran.
  
  
  METHODS
  We conducted treadmill exercise challenge test in 40 young asthmatic patients aged 6 to 18. After 8 minutes exercise to achieve 80% of maximum heart rate predicted for age, patients were examined and spirometry values recorded at frequent intervals. We defined exercise-induced asthma as 10% or more decline in Forced Expiratory Volume in one second (FEV1) within 30 minutes after exercise challenge.
  
  
  RESULTS
  Of 40 patients evaluated, 22 patients ( 55% of total ) met our criteria for exercise-induced asthma. Most positive responses (7 of 22, 31.8%) occurred at about 10 minutes after exercise. Cough was the most consistent sign (18 of 22 patients, 81%). In 2 patients (9%), FEV 1 decline did not accompany any symptom or sign.
  
  
  CONCLUSIONS
  We concluded that Exercise- induced asthma occurs in a relatively smaller subset of southern Iranian asthmatic children. Also treadmill exercise challenge performed by a trained staff, following standard protocol and using enough monitoring and precautions is safe and diagnostic in children and adolescents.
authors.forename: Abbas
authors.initials: A
authors.lastname: Fayezi
authors.forename: Reza
authors.initials: R
authors.lastname: Amin
authors.forename: Sara
authors.initials: S
authors.lastname: Kashef
authors.forename: Soheila
authors.initials: S
authors.lastname: Al Yasin
authors.affiliation: ahvaz jundishapur university of medical sciences. mohammadbahadoram@yahoo.com.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Bahadoram
mesh_terms: D000293:Adolescent; D001250:Asthma, Exercise-Induced / Q000175:diagnosis / Q000453:epidemiology*; D002648:Child; D005080:Exercise Test / Q000379:methods / Q000706:statistics & numerical data; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D007492:Iran / Q000453:epidemiology; D008297:Male; D015995:Prevalence; D012129:Respiratory Function Tests / Q000379:methods / Q000706:statistics & numerical data; D013147:Spirometry / Q000379:methods / Q000706:statistics & numerical data