Endurance raining damages small airway epithelium in mice

Airway inflammation in nonasthmatic amateur runners

Elite athletes show a high prevalence of symptoms and signs of asthma, but no study has assessed the acute effects of endurance exercise on airway cells in nonasthmatic athletes. We measured exhaled nitric oxide (NO) and collected samples of induced sputum after 3% NaCl aerosol administration for 20 min in nonasthmatic middle-aged amateur runners after the Fourth Palermo International Marathon and 6–9 wk later (habitual training period) at baseline. After the marathon, exhaled NO ( n = 9 subjects) was higher [27 ± 9 parts/billion (ppb)] than at baseline (12 ± 4 ppb; P < 0.0005). Polymorphonuclear neutrophil (PMN) counts in induced sputum were much higher in runners (91.2 ± 3.6% of total…

Exercise-induced changes in airway cells

Endurance Exercise Causes Mild Bronchial Epithelial Damage in Humans.