Body mass index bmi is a value used to get a general sense of a persons overall mass and is calculated using a persons height and weight. The calculation measures the total volume of water in the body lean tissue and muscle contain a higher percentage of water than fat and estimates the percentage of fat based on this information.
Body Mass Index Wikipedia
Body fat measurement wiki. Breathe in and exhale normally. For best results let your arms hang at your sides while someone else measures. Bf 457ρ 4142 100 siri formula is. Bf 495ρ 450 100. Guide the measuring tape around the waist at the belly button. The caliper method also called skinfold or pinch test involves pulling your subcutaneous fat away from your muscles at certain points and pinching it with measuring calipers.
Record the abdomen measurement after you have released the breath. 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 flows through the body and the voltage is measured in order to calculate impedance resistance of the body. To achieve this the meter passes a small harmless electric current through the body and measures the resistance then uses information on the persons weight height age and sex to calculate an approximate value for the persons body fat percentage. Body weight is measured in kilograms a measure of mass throughout the world although in some countries such as the united states it is measured in pounds or as in the united kingdom stones and pounds. For example your abdomen may measure 35 inches. Most hospitals even in the united states now use kilograms for calculations but use kilograms and pounds together for other purposes.
The body fat percentage is commonly calculated from one of two formulas ρ represents density in gcm 3. Most body water is stored in muscle. It is more often used than weight alone to determine if an individual is underweight normal weight overweight or obese. Use calipers to measure body fat.
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