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Bioelectrical impedance analysis (BIA) is a method for estimating body composition, in particular body fat and muscle mass, where a weak electric current flows through the body, and the voltage is measured in order to calculate impedance (resistance and reactance) of the body. Most body water is stored in muscle.
In 2009, Withings released a WiFi Body Scale which was the first [38] connected body scale. It measures weight and fat mass and sends data to the user's app over Wi-Fi, [39] and also connects to platforms such as Google Health [40] and Microsoft HealthVault [41] as well as diet and exercise sites such as DailyBurn. [42]
Hydrostatic weighing, also referred to as underwater weighing, hydrostatic body composition analysis and hydrodensitometry, is a technique for measuring the density of a living person's body. It is a direct application of Archimedes' principle , that an object displaces its own volume of water.
A wide variety of body composition measurement methods exist. The gold standard measurement technique for the 4-compartment model consists of a weight measurement, body density measurement using hydrostatic weighing or air displacement plethysmography, total body water calculation using isotope dilution analysis, and mineral content measurement by dual-energy X-ray absorptiometry (DEXA). [1]
In April 2012, [50] Fitbit released a weighing scale called the Fitbit Aria. It recognizes users and measures weight, body mass index and percentage of body fat of the user. It can keep track of eight individual users and updates information to fitbit.com automatically via Wi-Fi network. [51]
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