TY - JOUR
T1 - Oronasal distribution of ventilation at different ages
AU - James, David S.
AU - Lambert, William E.
AU - Mermier, Christine M.
AU - Chick, Thomas W.
AU - Stidley, Christine A.
AU - Samet, Jonathan M.
N1 - Funding Information:
Research described herein was supported by the National Institutes of Health National Research Service Award HL08446-01 (Dr. James); and by project number 89-7 from the Health Effects Institute (HEI), an organization jointly funded by the United States Environmental Protection Agency (EPA) (Assistance Agreement X812059) and automotive manufacturers.
PY - 1997
Y1 - 1997
N2 - 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.
AB - 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.
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U2 - 10.1080/00039899709602874
DO - 10.1080/00039899709602874
M3 - Article
C2 - 9124871
AN - SCOPUS:0030895220
SN - 0003-9896
VL - 52
SP - 118
EP - 123
JO - Archives of Environmental Health
JF - Archives of Environmental Health
IS - 2
ER -