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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 neuromuscular disease, a variety of factors can influence the compositional and micro structural aspects of muscle, including most notably muscle fiber atrophy and disorganization, the deposition of fat and connective tissues, as occurs in muscular dystrophy, and the presence of inflammation, among many other pathologies. EIM captures these ...
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]
But BMI tends to overestimate body fat in people with a lot of muscle and it doesn’t show how much abdominal fat you have, which is a risk factor for health issues like cardiovascular disease.
However, its accuracy declines at the extremes of body fat percentages, tending to slightly understate the percent body fat in overweight and obese persons (by 1.68–2.94% depending on the method of calculation), and to overstate to a much larger degree the percent body fat in very lean subjects (by an average of 6.8%, with up to a 13% ...
Dimitrios Kambouris/Getty; Amy Sussman/Getty. Angelina Jolie on June 16 (left) and Brad Pitt in 2019 (right).
Many parents are threatening no gifts from Santa Claus as a way to get their children to behave this holiday season. An expert explains why consistency is key if they want that method to work.
This is an accepted version of this page This is the latest accepted revision, reviewed on 14 January 2025. Relative weight based on mass and height Medical diagnostic method Body mass index (BMI) Chart showing body mass index (BMI) for a range of heights and weights in both metric and imperial. Colours indicate BMI categories defined by the World Health Organization ; underweight, normal ...