How Do BMI Scales Work?
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Understanding Your BMI
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Your BMI is your body mass index. The BMI is used to measure how much body fat you have by taking into consideration your height and weight. BMI scores can range from less than 18.5 meaning underweight, to over 30 meaning obese. Though your BMI can be calculated using your height and weight and a simple mathematical equation, products have now come on the market that test your BMI by standing on them like you would scales. These products are called BMI scales.
Bioelectrical Impedance Analysis
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Most BMI scales use Bioelectrical Impedance Analysis (BIA). BIA is a way to determine how much water is carried in body fat. Through BIA, the scales can determine your body composition and then make a pretty close assumption as to how much of your body is fat, muscle and water.
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The Process
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Before you stand on the scale your height is inputted into the scale. When you stand on the scale it starts by measuring your weight. A small, unnoticeable electric shock is then sent through your body. Using BIA, the scale is able to measure how much resistance is given to the current as it flows through your body. The more water your body has, the easier the electrical current will pass through your body. The higher your water content, the higher your muscle and leaner your tissue content. The scale can then use the feedback from the current to calculate how much of your body is water and lean or muscle tissue, and how much of your body is fat. The total body fat becomes your BMI.
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- Photo Credit Homedics
