BENEFICIAL EFFECT OF NASAL BREATHING ON EXERCISE-INDUCED BRONCHOCONSTRICTION

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Abstract
In the 1st step of a study of the relation of nasal and oral breathing during moderate treadmill exercise to the onset of bronchoconstriction in young patients with perennial bronchial asthma, most subjects spontaneously breathed with their mouths open when instructed to breath naturally. Subsequently, when they were required to breathe only through the nose during the exercise, an almost complete inhibition of the postexercise bronchonconstrictive airway response was demonstrated. When instructed to breathe only through the mouth during exercise, an increased bronchoconstrictive airway response occurred, as measured by spirometry, flow-volume relationships and body plethysmography. The nasopharynx and the oropharynx possibly play important roles in the phenomenon of exercise-induced bronchoconstriction.

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