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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.
The scales received media attention when magician Penn Jillette, having lost nearly 120 pounds in four months to preserve his health, attributed his success to a strict regimen and the Withings smart scale. [46] [47] Its Body Scan scale was launched in 2022, and it can perform an electrocardiogram and measure nervous activity. Body Scan ...
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However, research in the 1980s used computed tomography to measure deep fat, and showed a lack of correlation between that and subcutaneous fat. However, for children and adolescents the skinfold and circumference measurements provide a fair assessment of total body fat because that is where most body fat lies during those stages of human ...
Relative Fat Mass (RFM) is a simple formula for the estimation of overweight or obesity in humans that requires only a calculation based on a ratio of height and waist measurements. [ 1 ] High body fat is associated with increased risks of poor health and early mortality. [ 2 ]
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]