Document Detail

Comparison of exhaled nitric oxide and cardiorespiratory indices between nasal and oral breathing during submaximal exercise in humans.
MedLine Citation:
PMID:  9504133     Owner:  NLM     Status:  MEDLINE    
In order to examine the origin and role of nitric oxide (NO) in exhaled air during exercise, exhaled NO outputs of 8 healthy human subjects were compared using different breathing methods, through the mouth or nose, at two intensities of bicycle exercise. The concentration of NO in the exhaled air and ventilatory gas exchange variables were measured by a chemiluminescence analyzer and a mixing chamber method, respectively. The concentration and total output of NO in the expired air was significantly higher under nasal breathing than under oral breathing for both exercise intensities, whereas no significant difference was observed in cardiorespiratory variables between them. NO output increased significantly when exercise intensity was increased from unloaded (0 W) to 60 W under nasal breathing, but not under oral breathing. A negative correlation among subjects was found between NO output and minute ventilation in both breathing methods only for unloaded exercise. Data indicate that nasal airways have a large contribution, at least 50% of total NO output in the exhaled air during nasal breathing, but this nasal NO may have no further modulation on respiratory function during submaximal exercise by healthy humans.
Y Yasuda; T Itoh; M Miyamura; H Nishino
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  The Japanese journal of physiology     Volume:  47     ISSN:  0021-521X     ISO Abbreviation:  Jpn. J. Physiol.     Publication Date:  1997 Oct 
Date Detail:
Created Date:  1998-03-19     Completed Date:  1998-03-19     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  2985184R     Medline TA:  Jpn J Physiol     Country:  JAPAN    
Other Details:
Languages:  eng     Pagination:  465-70     Citation Subset:  IM; S    
Research Center of Physical Fitness, Sports and Health, Toyohashi University of Technology, Japan.
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MeSH Terms
Breath Tests
Carbon Dioxide / metabolism
Exercise / physiology*
Heart Rate / physiology
Hemodynamics / physiology
Least-Squares Analysis
Middle Aged
Mouth Mucosa / metabolism
Nasal Cavity / physiology
Nitric Oxide / metabolism*
Oxygen Consumption / physiology
Reference Values
Respiration / physiology*
Respiratory Transport
Reg. No./Substance:
10102-43-9/Nitric Oxide; 124-38-9/Carbon Dioxide

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