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Feeding-Induced Changes in Energy Expenditure in Children With Cystic Fibrosis

Department of Pediatrics, The Ohio State University College of Medicine, and Children's Hospital, Columbus, OH

C. Lawrence Kien, MD, PHD

Department of Pediatrics, The Ohio State University College of Medicine, and Children's Hospital, Columbus, OH

William B. Zipf, MD

Department of Pediatrics, The Ohio State University College of Medicine, and Children's Hospital, Columbus, OH

Karen S. McCoy, MD

Department of Pediatrics, The Ohio State University College of Medicine, and Children's Hospital, Columbus, OH

Seven children with cystic fibrosis (aged 7 to 12 years) were studied in the fasted and fed states. Using a primed, constant, intravenous infusion of NaH¹³CO₃, the rate of appearance of CO₂ (RaCO₂) was estimated. Net CO₂ excretion (VCO ₂) was also measured. Energy expenditure was calculated using the food quotient. RaCO₂ (mean ± SD) (µmol·kg^-1·min ^-1) in the fasted and fed states (297 ± 59 and 359 ± 67) was 117% and 105% of VCO₂ (259 ±48 and 352 ± 72). Feeding induced a 23% and a 37% increase in RaCO₂ and VCO₂, respectively, and respective 19% and 33% increases in energy expenditure (p < .05). Measurement of CO₂ production by isotopic dilution is a useful index of group changes in energy expenditure, including those induced by feeding. (Journal of Parenteral and Enteral Nutrition 18:497-502, 1994)

Journal of Parenteral and Enteral Nutrition, Vol. 18, No. 6, 497-502 (1994)
DOI: 10.1177/0148607194018006497


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