Document Detail

Oral airway flow dynamics in healthy humans.
MedLine Citation:
PMID:  9925899     Owner:  NLM     Status:  MEDLINE    
1. Oral airway resistance (RO) is an important determinant of oro-nasal partitioning of airflow (e.g. during exercise and sleep); however, little is known of factors influencing its magnitude and measurement. 2. We developed a non-invasive standardized technique for measuring RO (based on a modification of posterior rhinomanometry) and examined inspiratory RO in 17 healthy male subjects (age, 36 +/- 2 years (mean +/- s.e.m.); height, 177 +/- 2 cm; weight, 83 +/- 3 kg). 3. Inspiratory RO (at 0.4 l s-1) was 0.86 +/- 0.23 cmH2O l-1 s-1 during resting mouthpiece breathing in the upright posture. RO was unaffected by assumption of the supine posture, tended to decrease with head and neck extension and increased to 1.22 +/- 0.19 cmH2O l-1 s-1 (n = 10 subjects, P < 0.01) with 40-45 deg of head and neck flexion. When breathing via a mouth-mask RO was 2.98 +/- 0.42 cmH2O l-1 s-1 (n = 7) and not significantly different from nasal airway resistance. 4. Thus, in awake healthy male subjects with constant jaw position, RO is unaffected by body posture but increases with modest degrees of head and neck flexion. This influence on upper airway patency may be important when oral route breathing is associated with alterations in head and neck position, e.g. during sleep.
T C Amis; N O'Neill; J R Wheatley
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of physiology     Volume:  515 ( Pt 1)     ISSN:  0022-3751     ISO Abbreviation:  J. Physiol. (Lond.)     Publication Date:  1999 Feb 
Date Detail:
Created Date:  1999-05-07     Completed Date:  1999-05-07     Revised Date:  2013-06-11    
Medline Journal Info:
Nlm Unique ID:  0266262     Medline TA:  J Physiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  293-8     Citation Subset:  IM    
Department of Respiratory Medicine, Westmead Hospital, and University of Sydney, Westmead, NSW 2145, Australia.
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MeSH Terms
Airway Resistance / physiology*
Exercise / physiology
Mouth / physiology*
Nose / physiology
Posture / physiology
Sleep / physiology
Supine Position / physiology

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