Weight Loss Basics -- Basal Metabolic Rate (BMR) (Print Ready)
Knowing how much work the liver has to perform constantly, that’s hardly surprising. It is surprising though that the heart, which never ever rests, uses only 7%—a very efficient muscle, that. BMR Measurement An accurate measurement of BMR is a complex process that involves a gas analysis through either direct or indirect calorimetry (the measurement of quantities of heat)—don’t try this at home.
A rough estimation ofBMR can be made through an equation using age, sex, height, and weight. Many online tools are available using these factors to calculate your BMR. Use them. BMR can also be estimated by the determining the amount of lean tissue that makes up your body. Lean tissue at rest, whether male or female, burns roughly 16 calories per pound per day, so once lean mass is determined and multiplied by 16, you’d have the basal caloric need for that person. Why Do You Care? That takes us back to our old friend 1LTD, the First Law of Thermodynamics. To lose weight you need to burn more calories than you consume; and in order to establish exactly how many calories you burn during any given day, you need to account for BMR, which is 70% of that amount.
The proud owner of a body containing 125 pounds of lean mass would have a BMR of roughly 2,000 calories. Another 300 or so calories are spent by the digestive system. The rest is physical activity; say 600 calories depending on what you do. This person would burn 2,900 calories a day, so in order to lose weight he or she would have to consume less than 2,900 calories.
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