doubly labeled water

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doub·ly la·bel·ed wa·ter

(dŭb'lē lā'bĕld waw'tĕr)
Noncalorimetric technique for measuring energy expenditure in free-living subjects using an oral dose of water containingstable nonradioactive isotopes, 2H and 18O. Derived CO2 production is used to calculate energy expenditure using indirect calorimetry formulas.
References in periodicals archive ?
(7) Doubly-labeled water is considered the gold standard in the measurement of energy expenditure and is commonly used to validate other methods.
Use of doubly-labeled water (3HH18O) for determination of [H.sub.2]O flux and C[O.sub.2] production by a mammal in a humid environment.
C[O.sub.2] production in animals: an analysis of potential errors in the doubly-labeled water method.
Here we report results of a study of the at-sea metabolism of breeding Northern Fulmars at Shetland using the doubly-labeled water (DLW) technique.