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J Paediatr Child Health. 2004 Jul;40(7):380-3.

Measurement of resting energy expenditure in infants.

Author information

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

Abstract

OBJECTIVE:

The method for measurement of basal metabolic rate (BMR) using indirect calorimetry in adults is well established but is impractical in infants.

METHODS:

In this prospective study energy expenditure was measured using indirect calorimetry in 14 infants when sleeping and when lying quietly awake.

RESULTS:

Sleeping metabolic rate (SMR) was lower than energy expenditure (EE) measured in the same infants in a quiet resting state (mean difference [SD]: 297 [162] kJ/d; P < 0.005; 55 [33.4] kJ/kg per day; P < 0.005). The correlation within individuals suggests that these differences are related to the level of arousal. Awake EE, but not SMR, was significantly greater than estimated BMR using the FAO/WHO/UNU predictive equation.

CONCLUSIONS:

In infants, the level of arousal during measurement of EE can significantly impact on the interpretation of EE results. A standardized method for the measurement of EE in infants using indirect calorimetry is proposed.

[Indexed for MEDLINE]

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