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Age changes in body composition revealed by computed tomography.

G A Borkan, D E Hults, S G Gerzof

    Journal of Gerontology
    |November 1, 1983
    PubMed
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    Older men exhibit reduced lean body mass and altered fat distribution compared to middle-aged men, with fat infiltrating muscle tissue. The exact causes for these age-related body composition changes remain unclear.

    Area of Science:

    • Gerontology
    • Human Physiology
    • Body Composition Analysis

    Background:

    • Aging is associated with significant physiological changes.
    • Understanding age-related shifts in body composition is crucial for health management.
    • Previous research indicates potential differences in lean mass and fat distribution with advancing age.

    Purpose of the Study:

    • To investigate age-related differences in body composition between middle-aged and older men.
    • To quantify changes in lean tissue mass, fat mass, and fat distribution.
    • To explore potential fat infiltration into muscle tissue in older individuals.

    Main Methods:

    • Computed tomography (CT) scans were utilized to assess body composition.
    • Two groups were studied: middle-aged men (mean age 46.3 years) and older men (mean age 69.4 years).

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  • Measurements included total lean tissue, total fat mass, abdominal fat (subcutaneous and intra-abdominal), and muscle areas.

    • Main Results:

    • Older men were significantly lighter (8.2 kg less) than middle-aged men, primarily due to reduced lean tissue.
    • While total abdominal fat was similar, older men had less subcutaneous fat and more intra-abdominal fat.
    • Muscle areas in the legs and arms, as well as lean tissues in the abdomen and chest, were significantly smaller in older men.
    • Evidence of fat infiltration into lean tissues was observed in the older group.

    Conclusions:

    • Aging leads to a decline in lean body mass and a redistribution of fat, with increased intra-abdominal fat.
    • Fat infiltration into muscle tissue occurs with aging.
    • The underlying causes for these age-related body composition changes require further investigation.