The perception of dyspnea during exercise-induced bronchoconstriction in asthmatic children

Abstract

Introduction: The aim of this study is to investigate the difference of the perception of dyspnea between severity of EIB in asthmatic children. Methods: 6 minutes exercise challenge test by ergometer were performed in 185 asthmatic children (median age, 11.3 years). Sixty-three patients were under treatment with inhaled corticosteroids (ICS). The FENO was examined by the recommended method before exercise. Children classified themselves according to the modified Borg scales for their perception of dyspnea and general fatigue during exercise challenge test. Lung function test and Borg scales evaluation were performed before exercise and 0,5,15 minutes after exercise. According to max %fall of FEV1 after exercise, we divided into three groups. Results: In the severe EIB group (max %fall of FEV1≧20％, n=25), their perception of dyspnea were awared more strongly at 5(p Conclusion: In asthmatic children, it is difficult to distinguish mild EIB from EIB negative with questionnaire asking their perception of dyspnea and general fatigue. On the other hand, asthmatic children with severe EIB aware stronger perception of dyspnea and general fatigue at more than 5minites after exercise, not just after it.