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Related Experiment Videos

Total body composition by dual-photon (153Gd) absorptiometry.

R B Mazess, W W Peppler, M Gibbons

    The American Journal of Clinical Nutrition
    |October 1, 1984
    PubMed
    Summary

    Dual-photon absorptiometry accurately measures body composition, including lean-fat percentage and skeletal mineral mass. Anthropometry offers a comparable alternative for estimating body fat and lean body mass.

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    Area of Science:

    • Human Physiology
    • Body Composition Analysis
    • Radiological Imaging

    Background:

    • Accurate assessment of lean-fat composition and skeletal mineral mass is crucial for understanding human physiology and health.
    • Traditional methods like body density measurements have limitations in accounting for skeletal variations.
    • In vivo assessment techniques offer a non-invasive approach to body composition analysis.

    Purpose of the Study:

    • To evaluate dual-photon absorptiometry for in vivo determination of lean-fat composition (%FATR) and skeletal mineral mass.
    • To compare the accuracy of dual-photon absorptiometry with traditional body density methods (%FATD) for estimating body composition.
    • To assess the predictive capability of anthropometric measurements for lean-fat composition and lean body mass.

    Main Methods:

    • Dual-photon absorptiometry (153Gd) performed a rectilinear raster scan over the entire body in 18 subjects.
    • Single-photon absorptiometry (125I) measured bone mineral content on the radius.
    • Body density was determined using underwater weighing with residual lung volume correction to calculate %FATD.

    Main Results:

    • Percentage fat from absorptiometry (%FATR) and underwater density (%FATD) showed a strong correlation (r = 0.87).
    • Deviations between %FATD and %FATR were significantly influenced by skeletal mineral content (r = 0.90).
    • Anthropometric measurements (fatfolds, weight) predicted %FATR and lean body mass (LBM) with accuracy comparable to underwater density.

    Conclusions:

    • Skeletal mass variability necessitates its measurement for accurate body composition analysis, limiting the standalone utility of body density.
    • Dual-photon absorptiometry provides a reliable method for assessing both soft tissue composition and skeletal mineral mass.
    • Anthropometry serves as a practical and effective tool for estimating body fat and lean body mass when direct skeletal measurement is not feasible.

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