Total body composition by dual-photon (153Gd) absorptiometry
The lean-fat composition (%FATR) of soft tissue and the mineral mass of the skeleton were determined in vivo using dual-photon (153Gd) absorptiometry (dose under 2 mrem). A rectilinear raster scan was made over the entire body in 18 subjects (14 female, 4 male). Single-photon absorptiometry (125I) measured bone mineral content on the radius. Percentage fat (%FATD) was determined in the same subjects using body density (from underwater weighing with correction for residual lung volume). Lean body mass (LBM) was determined using both %FATR and %FATD. Percentage fat from absorptiometry and from underwater density were correlated (r . 0.87). The deviation of %FATD from %FATR was due to the amount of skeletal mineral as a percentage of the LBM (r . 0.90). Therefore, skeletal variability, even in normal subjects, where mineral ranges only from 4 to 8% of the LBM, essentially precludes use of body density as a composition indicator unless skeletal mass is measured. Anthropometry (fatfolds and weight) predicted %FATR and LBM at least as well as did underwater density. The predictive error of %FATR from fatfolds was 5% while the predictive error in predicting LBM from anthropometry was 2 to 3 kg (3%).
- Research Organization:
- Univ. of Wisconsin, Madison
- OSTI ID:
- 5975445
- Journal Information:
- Am. J. Clin. Nutr.; (United States), Vol. 40:4
- Country of Publication:
- United States
- Language:
- English
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BODY COMPOSITION
MONITORING
PHOTON EMISSION SCANNING
DIAGNOSTIC USES
ADIPOSE TISSUE
FAT CELLS
GADOLINIUM 153
IN VIVO
LABELLED COMPOUNDS
MAN
MINERALS
SKELETON
TRACER TECHNIQUES
ANIMAL CELLS
ANIMAL TISSUES
ANIMALS
BETA DECAY RADIOISOTOPES
BODY
CONNECTIVE TISSUE
CONNECTIVE TISSUE CELLS
DAYS LIVING RADIOISOTOPES
DIAGNOSTIC TECHNIQUES
ELECTRON CAPTURE RADIOISOTOPES
EVEN-ODD NUCLEI
GADOLINIUM ISOTOPES
INTERMEDIATE MASS NUCLEI
ISOTOPE APPLICATIONS
ISOTOPES
MAMMALS
NUCLEI
ORGANS
PRIMATES
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SOMATIC CELLS
TISSUES
USES
VERTEBRATES
550201* - Biochemistry- Tracer Techniques