Estimation of body volume by underwater weighing: description of a simple method.

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Abstract
A description is given of a simple inexpensive device to determine body volume by the underwater weighing method. A standard swimming pool with a shallow end was used, and a wooden shell was placed in the pool to prevent water movement affecting the weighing. The method described makes it possible to study large numbers of subjects without the need for a special water tank. The prone position was used since less movement occurred when breathing in this position. Nine to 10 trials of underwater weight were determined for 86 female subjects. The average of the last 3 trials was used as true underwater weight. Intraindividual variability associated with the last 3 trials of weighing was .0004-.0007 kg, and adjacent trial correlations of weighing were between .92 and .99. Mean body density calculated for 86 female subjects was 1.051, with a standard deviation of 0.014.

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