John underwent a body composition test which involved going under water and remaining still while the technician quickly took measurements. this method of body fat measurement is known as hydrostatic weighing.
What is hydrostatic weighing?
- The hydrostatic weighing method is one of the most accurate ways to determine body fat.
- The test will be administered while you are submerged in water while seated on a scale. An administrator will calculate your body fat percentage by comparing your weight on land to your weight underwater.
- Body volume and density measurements underwater are used to calculate body composition in densitometry, which also incorporates air displacement plethysmography. It uses Archimedes' displacement principle.
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