Sensitivity of methods for calculating energy expenditure by use of doubly labeled water
Attempts to estimate human energy expenditure by use of doubly labeled water have produced three methods currently used for calculating carbon dioxide production from isotope disappearance data: (1) the two-point method, (2) the regression method, and (3) the integration method. An ideal data set was used to determine the error produced in the calculated energy expenditure for each method when specific variables were perturbed. The analysis indicates that some of the calculation methods are more susceptible to perturbations in certain variables than others. Results from an experiment on one adult human subject are used to illustrate the potential for error in actual data. Samples of second void urine, 24-h urine, and breath collected every other day for 21 days are used to calculate the average daily energy expenditure by three calculation methods. The difference between calculated energy expenditure and metabolizable energy on a weight-maintenance diet is used to estimate the error associated with the doubly labeled water method.
- Research Organization:
- Beltsville Human Nutrition Research Center, MD (USA)
- OSTI ID:
- 6074690
- Journal Information:
- J. Appl. Physiol.; (United States), Journal Name: J. Appl. Physiol.; (United States) Vol. 66:2; ISSN JAPYA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
ANIMALS
CALCULATION METHODS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
DATA COVARIANCES
DEUTERIUM
DOUBLE LABELLING
HEAVY WATER
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
LABELLING
LIGHT NUCLEI
MAMMALS
MAN
MATHEMATICS
METABOLISM
NUCLEI
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
PRIMATES
REGRESSION ANALYSIS
SENSITIVITY ANALYSIS
STABLE ISOTOPES
STATISTICS
TRACER TECHNIQUES
VERTEBRATES
WATER