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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
While impractical for field or general use, underwater weighing provides an accurate point against which other measures can be validated.
Correlation coefficients between hydrodensitometry (underwater weighing; UWW), [sup.40]K spectroscopy (K40) and Jackson-Pollock skinfold equation (SFJP) methods within each age group for % body fat
The most accurate test, underwater weighing, is also the most cumbersome and thus is not available except in some hospitals and research labs.
Laboratory procedures such as underwater weighing are typically difficult to perform -- and costly.
Techniques such as dual X-ray absorptiometry (DEXA), magnetic resonance imaging (MRI), and underwater weighing are just a few.
There are several methods of determining the percentage of fat and lean body mass in your body, and the best of these is by underwater weighing. While body fat levels do not change with age, the percentage of body fat can be maintained at a suitable level throughout a lifetime.

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