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Related Experiment Video

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Non-invasive Optical Measurement of Cerebral Metabolism and Hemodynamics in Infants

Non-invasive Optical Measurement of Cerebral Metabolism and Hemodynamics in Infants

Published on: March 14, 2013

Determining energy expenditure in preterm infants: comparison of 2H(2)18O method and indirect calorimetry.

C L Jensen¹, N F Butte, W W Wong

¹United States Department of Agriculture, Department of Pediatrics, Baylor College of Medicine, Houston, Texas 77030.

The American Journal of Physiology

|September 1, 1992

Summary

The doubly labeled water method accurately estimates energy expenditure in preterm infants. This study validated the method against indirect calorimetry, finding close agreement despite individual variability.

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Area of Science:

Neonatal physiology
Energy metabolism research
Biomarker validation

Background:

The doubly labeled water (2H218O) method is sensitive to analytic error in preterm infants due to high body water content.
Accurate measurement of total energy expenditure (EETotal) is crucial for understanding preterm infant metabolism.

Purpose of the Study:

To evaluate the utility of the 2H218O method for measuring energy expenditure in preterm infants.
To compare energy expenditure (EE) estimates from 2H218O with indirect calorimetry in this population.

Main Methods:

Simultaneous measurement of EE in 12 preterm infants using indirect calorimetry and the 2H218O method over 5 days.
Indirect calorimetry utilized an environmental chamber and heart rate monitoring; EE was continuously assessed.
2H218O method involved isotopic dosing, serial urine collection, and gas-isotope-ratio mass spectrometry for enrichment analysis.

Main Results:

The ratio of 2H to 18O dilution spaces was 1.01 ± 0.01, and the ratio of turnover rates (kO/kH) was 1.16 ± 0.04.
Energy expenditure estimated by 2H218O and indirect calorimetry agreed within 1% on average.
Significant individual variability was observed between the two methods.

Conclusions:

The 2H218O method provides a valid estimation of total energy expenditure in preterm infants when compared to indirect calorimetry.
Despite overall agreement, the individual variability highlights the need for careful application and interpretation in preterm neonates.