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Energy expenditures in four men estimated by D/sub 2/ /sup 18/O method at two times. III. Calculation methods and sources of error

Conference · · Fed. Proc., Fed. Am. Soc. Exp. Biol.; (United States)
OSTI ID:5392217
; ; ; ; ; ;
Three different methods have been used to calculate energy expenditures (EE) from D and /sup 18/O elimination data collected on 4 men as previously described. The three methods included the two-point method, regression analysis, and the Cambridge integration method. Estimates of body composition (initial, final, and/or across 21 days) were obtained by use of total body impedance analysis, D/sub 2/O or D/sub 2/ /sup 18/O dilution, under water weighting, and skinfold measurements and from the intercepts of D or /sup 18/O disappearance rates (log plots). Initial evaluations suggest that the different calculation methods yield different results with some data; these differences are larger for some sets of data compared to others. Variability in estimated total body water (derived from body composition estimates) have significant effects on calculated EE, EE estimates from EI are very sensitive to small changes in body composition (e.g., % body fat) including those changes which are probably within the error of measurement for most body composition methods.
Research Organization:
Dept. of Agriculture, Beltsville, MD
OSTI ID:
5392217
Report Number(s):
CONF-8604222-
Conference Information:
Journal Name: Fed. Proc., Fed. Am. Soc. Exp. Biol.; (United States) Journal Volume: 45:3
Country of Publication:
United States
Language:
English

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Related Subjects

550501* -- Metabolism-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ANIMALS
BODY COMPOSITION
CALCULATION METHODS
DEUTERIUM
DOUBLE LABELLING
ERRORS
EVEN-EVEN NUCLEI
HEAVY WATER
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
LABELLING
LIGHT NUCLEI
MAMMALS
MAN
MATHEMATICS
METABOLISM
NUCLEI
ODD-ODD NUCLEI
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PRIMATES
REGRESSION ANALYSIS
STABLE ISOTOPES
STATISTICS
TRACER TECHNIQUES
VERTEBRATES
WATER