title: Comparison of a face-mask and a mouthpiece for measuring resting energy expenditure with the 'Oxylog'.
abstract: Resting energy expenditure measurements were made simultaneously with an Oxylog and a ventilated hood indirect calorimeter, using (a) the Oxylog with the original oronasal face-mask and (b) the Oxylog with a mouthpiece and a noseclip, both in 15 subjects. The mean difference between Oxylog energy expenditure, when used with the mouthpiece, and ventilated hood measurements was very small: -0.4% (p less than 0.4; n = 15). When used with the face-mask, the Oxylog tended to underestimate energy expenditure relative to the ventilated hood, the mean difference being -2.4% (p = 0.054; n = 13). In 2 subjects, the Oxylog face-mask showed obvious leaks. The subjects did not find the mouthpiece less comfortable than the face-mask, and there was no evidence that the mouthpiece disturbed respiration more than the face-mask. The Oxylog is therefore suitable for measurements of resting energy expenditure, but the use of a mouthpiece and noseclip is preferable to the use of the original Oxylog face-mask.
authors.affiliation: Rowett Research Institute, Bucksburn, Aberdeen, UK.
authors.forename: S G
authors.initials: SG
authors.lastname: Bukkens
authors.forename: G
authors.initials: G
authors.lastname: McNeill
mesh_terms: D000328:Adult; D004734:Energy Metabolism / Q000502:physiology*; D004867:Equipment Design; D004864:Equipment and Supplies; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology*; D012119:Respiration / Q000502:physiology*; D012146:Rest / Q000502:physiology*