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Definition of Underwater weighing

Underwater weighing: A method for determining the lean body mass. This method weighs a person underwater and then calculates the lean body mass (muscle) and body fat. This method is one of the more accurate ones. However, it is generally done in special research facilities, and the equipment is costly. Also called hydrostatic weighing.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=25888
Last Editorial Review: 6/14/2012

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