Oronasal Distribution of Ventilation at Different Ages
| Autor: | William E. Lambert, Christine A. Stidley, Jonathan M. Samet, Christine M. Mermier, David S. James, Thomas W. Chick |
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| Rok vydání: | 1997 |
| Předmět: |
Adult
Male Aging Adolescent Physical exercise Nose Positive-Pressure Respiration Route of administration Humans Environmental Chemistry Medicine Respiratory system Young adult Child Volunteer Aged General Environmental Science Inhalation business.industry Airway Resistance Respiration Public Health Environmental and Occupational Health Mouth Breathing Middle Aged Respiratory Function Tests medicine.anatomical_structure Anesthesia Breathing Female business |
| Zdroj: | Archives of Environmental Health: An International Journal. 52:118-123 |
| ISSN: | 0003-9896 |
| DOI: | 10.1080/00039899709602874 |
| Popis: | The route of breathing, oral or nasal, is a determinant of the doses of inhaled pollutants delivered to target sites in the upper and lower respiratory tracts. We measured partitioning of ventilation, using a divided oronasal mask during a submaximal exercise test, in 37 male and female subjects who ranged in age from 7 to 72 y. The following four patterns of breathing were evident during exercise: (1) nasal only (13.5%), nasal shifting to oronasal (40.5%), oronasal only (40.5%), and oral only (5.4%). Children (i.e., 7-16 y of age) displayed more variability than adults with respect to their patterns of ventilation with exercise. Young adults (i.e., 17-30 y of age) who initially breathed nasally with exercise switched to oral ventilation at a lower percentage of the previously measured maximum ventilation (10.8%) than older subjects (31.8%). The partitioning of ventilation between the nasal and oral routes follows complex patterns that cannot be predicted readily by the age, gender, or nasal airway resistance of the subject. |
| Databáze: | OpenAIRE |
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