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 ?
Some types of data sets are good only to serve as validation sets, for example, the doubly labeled water data set, where there is only one reading of total energy expenditure every two weeks.
As mentioned earlier, doubly labeled water is the most accurate method to estimate energy expenditure, but provides only one reading per 14 days.
Results of doubly labeled water studies are of paramount importance during the prerelease evaluation of the candidate models because they provide valuable feedback on how an algorithm would behave in free-living settings.
Validation of Pattern-Recognition Monitors in Children Using the Doubly Labeled Water Method.
1997) A 7 day activity diary for assessment of daily energy expenditure validated by the doubly labeled water method in adolescents.
2002) Energy expenditure assessed by heart rate and doubly labeled water in young athletes.
2005) Appendix I: Doubly labeled water data used to predict energy expenditure.
Use of an automated chromium reduction system for hydrogen isotope ratio analysis of physiological fluids applied to doubly labeled water analysis.
Validation of the use of tritiated water, doubly labeled water, and 22Na for estimating food, energy, and water intake in Little Penguins, Eudyptula minor.
Doubly labeled water method: in vivo oxygen and hydrogen isotope fractionation.
Measurement of energy expenditure in humans by doubly labeled water method.
Measurement of total energy and material balance in rats by means of doubly labeled water.