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To the Editor.—
I think the problem of asthmogenicity (236:152, 1976) in the various sports can be solved by looking at the type of breathing in these events. Swimming is done in a prone or supine position, where diaphragmatic breathing is the rule. In addition, expiration is done against resistance.These two factors—diaphragmatic breathing and exhalation against pressure—reduce trapped air and prevent asthma.
Sheehan GA. Asthma and Athletic Performance. JAMA. 1977;237(2):120. doi:10.1001/jama.1977.03270290020017
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