| Oronasal distribution of respiratory airflow. | |
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MedLine Citation:
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PMID: 7244427 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The oronasal distribution of respiratory airflow was determined during incrementally graded submaximal exercise in 30 (14 M, 16 F) healthy adult volunteers. Nasal airflow was measured by a pneumotachograph attached to a nasal mask. Oral airflow was determined as the difference between nasal airflow and total pulmonary airflow, the latter being measured by a head-out exercise body plethysmograph. The two airflow signals were sampled every 20 msec by a microprocessor, which calculated the oral and nasal minute volumes (separating inspiration and expiration) and produced an on-line print-out of the results. Twenty subjects ("normal augmenters") switched from nasal to oronasal breathing at a VE of 35.3 +/- 10.8 1 . min-1, four subjects ("mouth breathers") habitually breathed oronasally, five subjects ("nose breathers") persistently breathed through the nose only, and one subject showed no consistent nose/mouth breathing pattern. After the switch to oronasal breathing, the nasal portion of VE decreased suddenly to 57% of total VE. With a further increase of VE, oral minute volume increased rapidly, equalling nasal minute volume at a VE of 45 1 . min-1, and accounting for 61% of the total ventilation at high respiratory minute volumes (90 1 . min-1). During oronasal breathing, normal augmenters inspired some 2 1 . min-1 more nasally than they expired. Similarly, the nasal inspiration of mouth breathers exceeded expiration by 2 1 . min-1 at rest, but the difference increased to 13.51 . min-1 at a VE of 81.51 . min-1. |
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Authors:
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V Niinimaa; P Cole; S Mintz; R J Shephard |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Respiration physiology Volume: 43 ISSN: 0034-5687 ISO Abbreviation: Respir Physiol Publication Date: 1981 Jan |
Date Detail:
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Created Date: 1981-08-10 Completed Date: 1981-08-10 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0047142 Medline TA: Respir Physiol Country: NETHERLANDS |
Other Details:
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Languages: eng Pagination: 69-75 Citation Subset: IM; S |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Adult Humans Mouth Breathing / physiopathology Nasal Cavity / physiology Oropharynx / physiology* Physical Exertion* Respiration* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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