Breathing dry or humid air and exercise-induced asthma during swimming.

摘要: Recent studies have shown the relevance of air humidity to provocation bronchoconstriction by running. The present study was undertaken ascertain whether humid breathed during swimming could explain protective effect on asthmatic. Nine asthmatic children 9–15 years old swam while inspiring dry (25–35% R. H.) or (80–90% administered in a random order, week separating two sessions. exercise challenge an 8-min tethered swim at metabolic rate (\(\dot V\)O2) 29 ml·kg−1·min−1, minute ventilation (VE) 34 L·min−1, and heart (HR) 161 beats·min−1. Ambient water temperature were 28±2‡ C 27±2‡ C, respectively. Pulmonary functions tested pre post swimming. Exercise VE, VO2 HR similar under conditions. No reduction any pulmonary (FVC, FEV1.0, MMEFR, MBC) found after 5 10 minutes following either In contrast, treadmill run ventilatory intensity induced when room dried 25–30% H. It is suggested that, unlike running, low asthmogenicity even inspired neutral temperatures.