title: Repeatability and methodology of resting energy expenditure in patients with cystic fibrosis.
abstract: In this study, intra-individual variation of resting energy expenditure (REE) in adults with cystic fibrosis (CF) and the effect of measurement duration were determined. Twelve adults with CF and chronic Pseudomonas aeruginosa (Ps. aeruginosa) infection and 12 healthy volunteers, matched for age and sex were studied whilst clinically stable on days 1.2, and 15. Respiratory gas exchange was monitored by continuous measurement of oxygen uptake (VO2) and carbon dioxide production (VCO2) using a ventilated hood indirect calorimeter. Coefficients of variation (CVs) were 4.3% in patients and 2.4% in controls comparing days 1 and 2. The CV for patients was 5.0% and for controls 2.9% comparing days 1 and 15. The effect of measurement duration on REE was assessed in eight of the CF patients. REE remained stable for 40 min but tended to rise by 80 min. Plasma catecholamine concentrations were stable between study days in patients but fell with time in controls suggesting some adaptation to experimental procedure. The greater variability of REE in patients was related to change in serum CRP over 2 weeks. REE is a repeatable measurement in clinically stable patients with CF, though variability was greater in patients than healthy subjects. This has implications for the design and interpretation of longitudinal studies of REE in patients with chronic lung disease.
authors.affiliation: Section of Respiratory Medicine, University of Wales College of Medicine, Llandough Hospital and Community NHS Trust, Penarth, South Glamorgan, UK. bells@health.qld.gov.au
authors.forename: S C
authors.initials: SC
authors.lastname: Bell
authors.forename: J S
authors.initials: JS
authors.lastname: Elborn
authors.forename: L E
authors.initials: LE
authors.lastname: Nixon
authors.forename: I A
authors.initials: IA
authors.lastname: Macdonald
authors.forename: D J
authors.initials: DJ
authors.lastname: Shale
mesh_terms: D000305:Adrenal Cortex Hormones / Q000627:therapeutic use; D000328:Adult; D001481:Basal Metabolism / Q000502:physiology*; D001993:Bronchodilator Agents / Q000627:therapeutic use; D002097:C-Reactive Protein / Q000032:analysis; D003270:Contraceptive Agents / Q000627:therapeutic use; D003550:Cystic Fibrosis / Q000503:physiopathology*; D004837:Epinephrine / Q000032:analysis; D005541:Forced Expiratory Volume / Q000502:physiology; D006801:Humans; D009638:Norepinephrine / Q000032:analysis; D011552:Pseudomonas Infections / Q000503:physiopathology*; D011659:Pulmonary Gas Exchange / Q000502:physiology*
chemical_list: D000305:Adrenal Cortex Hormones; D001993:Bronchodilator Agents; D003270:Contraceptive Agents; D002097:C-Reactive Protein; D009638:Norepinephrine; D004837:Epinephrine