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Exercise is a well-known trigger for asthma symptoms. In patients with asthma, strenuous physical activity increases the risk of an asthma attack, with a ‘U’-shaped curve showing that moderate exercise training carries a lower risk of asthma compared to high-intensity exercise training. Lack of physical activity appears to be independently associated with increased bronchial hyper-responsiveness (BHR).1 These observations are confirmed by a growing number of murine studies, but reviews examining the epidemiological evidence for such associations in humans show that the overall evidence on exercise and asthma is, at best, very …
Competing interests None declared.
Ethics approval Ethics Review Board of the Clinical Hospital (protocol 0121/10).
Provenance and peer review Commissioned; internally peer reviewed.