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The body volume and density is calculated by using standard measure body fat formulas (Siri or Brozek). measure body fat Body fat percentage is then calculated from body density. A person with more bone and muscle will weigh more in water, meaning they have a higher bone density and lower percentage of body fat The underwater weighing system uses strain gauges mounted under the water on the floor of a stainless steel tank. A person kneels or sits on a cot or stool placed on these gauges which allows the body mass to be suspended in water. This method is not practical measure body fat for testing large numbers of people because it requires a lot of cooperation from each individual. It is difficult for people who are not comfortable with swimming, or apprehensive about submersion, or who simply have difficulty expelling all the air in their lungs (a requirement for the test), and may take from 15 minutes to an hour to obtain valid results. The system requires a number of pieces of special equipment and experienced technicians, thereby limiting the method to clinics and sophisticated health clubs.
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