Body Fat Measurement Electrical Impedance Accuracy

In part 1 of this series you learned about how body fat testing is a prediction not a measurement. This week we investigate the accuracy of bioelectrical impedance analysis bia for measuring percentage body fat and predicting a patients risk of cardiovascular and other diseases of. Used a lab based machine called a bod pod to take accurate body fat measurements.
body fat measurement electrical impedance accuracy

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In part 2 you learned about underwater weighing and in part 3 you learned about the bod pod.

Body fat measurement electrical impedance accuracy. Bioelectrical impedance analysis bia is a method for measuring body composition based on the rate at which an electrical current travels through the body. Now lets talk about bia. They run a light electrical current through your body measure the degree of resistance or impedance to the flow of the current then use this information to estimate your body fat percentage. Limited information is available but some 3 d scanners may be fairly accurate with errors of around 4 body fat.

Most research shows that body fat scales arent accurate enough to track changes in body composition over time. However the convienience of this method comes at a price of accuracy. Body fat adipose tissue causes greater resistance impedance than fat free mass and slows the rate at which the current travels. Body fat scales use bioelectrical impedance analysis.

Bioelectrical impedance analysis bia is a commonly used method for estimating body composition in particular body fat and muscle massin bia a weak electric current flow through the body and the voltage is measured in order to calculate impedance resistance of the body. Most body water is stored in muscle. Bioelectrical impedance bia bia is one of the quickest and easiest methods for predicting body fat. Here is a video showing how a 3 d body scanner works.

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 168294 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 68 with up to a 13 overstatement of the reported body percentage of one. Body fat scales can be an easy way to track your body fat percentage but they may not tell the complete story about your health. Sends a weak electrical impulse through the body. Accuracy can also vary depending on various factors including.