underwater weighing


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un·der·wat·er weigh·ing

(ŭn'dĕr-waw'tĕr wā'ing)
Assessment of body volume by measuring a person's weight in air and again under water; loss of scale weight (corrected for water density) equals body volume. Body density (body mass:volume ratio) is then used to compute percent body fat.
Synonym(s): densitometry, hydrodensitometry, hydrostatic weighing.

underwater weighing

an accurate method for the measurement of body density from which the percentages of body fat and lean body mass can be determined using standard equations. Weight in air is compared with weight in water during brief immersion, holding the breath after full expiration (at residual lung volume which is separately measured). Density is calculated from the volume of water displaced according to the Archimedes principle, which states that an object submerged in water is buoyed up by the weight of water displaced. syn hydrostatic weighing. See also body composition.
References in periodicals archive ?
Validity of this approach has been demonstrated in children, with two or more skinfolds at different sites having high correlation with estimation of body fatness from underwater weighing (Harsha, 1978).
fat quantities ranged from 10 5 percent with DEXA (a highly accurate method used primarily in research facilities), 9 percent with underwater weighing, 8.
The most accurate test, underwater weighing, is also the most cumbersome and thus is not available except in some hospitals and research labs.
The BOD POD replaces inaccurate skinfold calipers and the inconvenient underwater weighing test method.

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