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A hydrostatic weighing method using total lung capacity and a small tank.

J G Warner, R Yeater, L Sherwood

British Journal of Sports Medicine

|March 1, 1986

Summary

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This study validates a new hydrostatic weighing method using total lung capacity (TLC) in a prone position. This tank method is a reliable and accurate technique for measuring body density and body fat percentage.

Area of Science:

Physiology
Anthropometry

Background:

Hydrostatic weighing is a gold standard for body composition analysis.
Accurate determination of lung volumes is crucial for precise body density measurements.

Purpose of the Study:

To validate and assess the reliability of a novel hydrostatic weighing method.
This method utilizes total lung capacity (TLC) measured in a prone position within a small tank.

Main Methods:

Compared the TLC prone (tank) method against three established pool-based hydrostatic weighing methods (RV seated, TLC seated, TLC prone).
Assessed validity using correlation coefficients and reliability through repeated measurements.
Eighty subjects participated in the validity testing, and twenty in reliability testing.

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Main Results:

High validity coefficients (0.98-0.99) were found between the TLC prone (tank) method and pool methods for % body fat.
Reliability coefficients for body density and % body fat were also high (0.99).
Significant differences in body density and % body fat were observed between the residual volume seated (pool) method and TLC methods, though HW error differences were negligible.

Conclusions:

The TLC prone (tank) method is a valid and reliable technique for hydrostatic weighing.
This method offers a favorable alternative for body composition assessment.