Changes in airway resistance induced by nasal inhalation of cold dry, dry, or moist air in normal individuals

J Appl Physiol (1985). 1996 Oct;81(4):1739-43. doi: 10.1152/jappl.1996.81.4.1739.

Abstract

Nasopulmonary bronchomotor reflexes elicited by mechanical or irritant stimulation of the nose have been described in animals and asthmatic patients. However, few studies were devoted to the consequences of nasal breathing of cold and dry air or of only dry or only moist air on the bronchomotor control in normal individuals. The present study reported changes in interruption resistance (Rint) measured during eupneic breathing of moderately cold (-4 or -10 degrees C) and dry [0.3% relative humidity (RH)] air or of room air at 23 degrees C that is either dry (0.3% RH) or moist (97% RH). Nasal inhalation of cold (-4 degrees C) dry air or of only dry air significantly increased baseline Rint value (17 and 21%, respectively) throughout the 15-min test periods. The response to cold was significantly accentuated when the air temperature was lowered to -10 degrees C (42%). After nasal anesthesia or inhalation of a cholinergic antagonist, cold air did not induce a change in Rint. Nasal inhalation of moist room air had no effect. No Rint changes were measured during oral breathing of the three test agents. It is concluded that the activation of cold receptors or osmoreceptors in the nasal mucosa induces protective bronchoconstrictor responses in normal individuals.

Publication types

  • Clinical Trial
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Administration, Inhalation
  • Adult
  • Airway Resistance / drug effects
  • Airway Resistance / physiology*
  • Cholinergic Antagonists / administration & dosage
  • Cholinergic Antagonists / pharmacology
  • Cold Temperature / adverse effects*
  • Female
  • Forced Expiratory Volume
  • Humans
  • Humidity / adverse effects*
  • Male
  • Mechanoreceptors / drug effects
  • Mechanoreceptors / physiology
  • Middle Aged
  • Nasal Mucosa / drug effects
  • Nasal Mucosa / physiology
  • Pharynx / drug effects
  • Pharynx / physiology
  • Reference Values
  • Reflex / drug effects
  • Reflex / physiology
  • Vital Capacity

Substances

  • Cholinergic Antagonists