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Comparison of Gas Exchange Measurements With a Mouthpiece, Face Mask, and Ventilated Canopy
Author(s) -
Forse R. Armour
Publication year - 1993
Publication title -
journal of parenteral and enteral nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.935
H-Index - 98
eISSN - 1941-2444
pISSN - 0148-6071
DOI - 10.1177/0148607193017004388
Subject(s) - mouthpiece , carbon dioxide , canopy , respiratory quotient , oxygen , environmental science , materials science , chemistry , medicine , dentistry , biology , ecology , organic chemistry
This study compared gas exchange measurements obtained by using a mask, mouthpiece, and ventilated canopy in 30 normal, healthy volunteers. The ventilated canopy and its gas analyzers had an accuracy for oxygen consumption of 98.0 ± 0.8% and for carbon dioxide production of 100.1 ± 1.1%. The study indicates that the apparatus used for gas exchange measurement will significantly affect the measurements. The magnitude of the effect is a significant 7.9% increase for oxygen consumption with a mouthpiece and a significant 7.1% increase with a face mask. Carbon dioxide production was significantly increased 10.2% with a mouthpiece and 4.1% with a face mask. There were no differences in the respiratory quotient. The specific purpose for collecting gas exchange measurements will determine whether these differences are of practical significance. (Journal of Parenteral and Enteral Nutrition 17:388–391, 1993)