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Paper Information

Title: 

NASAL TO ORONASAL SWITCHING DURING EXERCISE

Type: PAPER
Author(s): KHAMENEHEI S.*
 
 *TUBERCULOSIS AND LUNG DISEASES RESEARCH CENTER, TABRIZ UNIV OF MED SCIENCES
 
Name of Seminar: IRANIAN CONGRESS OF PHYSIOLOGY AND PHARMACOLOGY
Type of Seminar:  CONGRESS
Sponsor:  PHYSIOLOGY AND PHARMACOLOGY SOCIETY, MASHHAD UNIVERSITY OF MEDICAL SCIENCE
Date:  2007Volume 18
 
 
Abstract: 

There is a choice for humans to breathe via nose, mouth or both. Nasal route has the major role in processing the inspired air which is finally delivered to the lower respiratory tract and alveoli. Inspired air is warmed and humidified mainly in the nose and not in the mouth article precipitation is performed more efficiently in nasal route. At rest nasal route is preferred. During exercise, however, beyond a certain level of ventilatory effort, it is shifted to oronasal state. Although there are some underlying physiological and anatomical factors, this appears to depend partly on personal perception of effort intensity. It is shown that the oronasal switching point (OSP) is correlated with the level turbulence which occurs in the nose. Nasal stripes are simple tools to reduce resistance and thereby facilitate and lengthen nasal breathing during exercise. It has also been shown that African Americans have a higher maximum inspiratory flow rate at this point, when compared to white Americans. Our studies indicate a higher intentional nasal breathing when compared to that of habitual one. According to these studies, although the time and the level of ventilation at OSP are less in women, but they show a higher ventilatory slope. Another series of experiments in our laboratory have demonstrated that training can significantly increase both the time and intensity of ventilatory effort tolerated via nose.

 
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