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Measurement of resting energy expenditure in infants

J E Bines1, H D Truby

  • 1Gastroenterology and Clinical Nutrition, Royal Children's Hospital, Paediatrics, University of Melbourne, Melbourne, Victoria, Australia. julie.bines@rch.org.au

Journal of Paediatrics and Child Health
|July 2, 2004
PubMed

Insights

Measuring infant energy expenditure (EE) requires careful consideration of arousal state. Sleeping metabolic rate (SMR) is lower than awake EE, impacting basal metabolic rate (BMR) estimations.

Area of Science:

  • Pediatric physiology
  • Metabolic research
  • Indirect calorimetry applications

Background:

  • Basal metabolic rate (BMR) measurement via indirect calorimetry is standard in adults but challenging in infants.
  • Infant metabolic rate assessment requires specialized, practical methodologies.

Purpose of the Study:

  • To compare energy expenditure (EE) in sleeping versus awake infants.
  • To evaluate the impact of arousal state on infant metabolic rate measurements.
  • To assess the suitability of predictive equations for infant BMR.

Main Methods:

  • Prospective study involving 14 infants.
  • Indirect calorimetry used to measure energy expenditure.
  • Measurements taken during both sleeping and quiet awake states.

Main Results:

  • Sleeping metabolic rate (SMR) was significantly lower than awake energy expenditure (EE).
  • Differences in EE were correlated with the infant's arousal level.
  • Awake EE, not SMR, exceeded estimated BMR from predictive equations.

Conclusions:

  • Infant arousal state critically influences energy expenditure (EE) measurements.
  • A standardized indirect calorimetry method for infant EE assessment is proposed.
  • Current predictive equations may not accurately reflect infant BMR due to arousal variations.
Abstract

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