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Bioelectrical impedance analysis. 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.
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% ...
By comparison with BMI, BRI quantifies body girth in relation to height, potentially providing more accurate estimates of fat mass. BRI scores range from 1 to 16, with most people between 1 and 10, although people with scores of 6.9 and up – indicating wider, rounder bodies – were found to have a risk of all-cause mortality that was ...
Body fat percentage is a measure of how much body fat you have in relation to your overall weight. It can be more accurate than BMI at assessing whether someone has a healthy weight and whether ...
In physical fitness, body composition refers to quantifying the different components (or "compartments") of a human body. [ 1 ] The selection of compartments varies by model but may include fat, bone, water, and muscle. [ 2 ] Two people of the same gender, height, and body weight may have completely different body types as a consequence of ...
v. t. e. The body adiposity index (BAI) is a method of estimating the amount of body fat in humans. The BAI is calculated without using body weight, unlike the body mass index (BMI). Instead, it uses the size of the hips compared to the person's height. Based on population studies, the BAI is approximately equal to the percentage of body fat ...
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