If you're trying to discover how your body is shedding energy you must find out the least amount of calories your body needs at compltete rest.
This is called your BMR, basal metabolic rate You can't get this done anywhere. It's essential you know how to figure you're BMR
Preparation
First you have to fast for a full twelve hours. It's completed to ensure your body is at rest, and free of activity.
Next, a full eight hours of sleep, and you sleep at a slight incline. This takes stress off of key points of your body. Thus your body is rested, relaxed, and you're feeling no stress. Finally, just to be sure you are truly calm, the measurements are normally taken in a darkened room.
Formulas for Calculation
When it comes to the actual calculations, there are two formulas typically used. There is the Harris-Benedict equation, and then the Mifflin equation. It's been found that the Harris-Benedict is not entirely accurate when used by people who are very young, very old, or rather overweight. So, keep that in mind when reviewing the number it gives you.
In terms of the actual formulas, they differ for men and women, and are as follows: For Harris-Benedict, a man's BMR is found by multiplying his weight in kilograms by 13.75, adding it to five times his height in cm, subtracting the product of his age times 6.76, and then adding sixty-six. For Women, the set up is different, but main points are the same.
It is 9.56 times her weight in kilograms, then add 1.85 times her height (also in centimetres), subtract 4.68 times her age, and add 655.
With the Mufflin equation, it also differs by gender, and is as follows: A man's BMR is equal to ten times his weight (still in kg), plus 6.25 times his height, subtracting five times his age, and adding five. For a woman, the formula is the same, except for the last factor. Rather than the addition of five, subtract 161. This does make it a very easy formula to use under and circumstance.
Things to Think About
Now, there are some other things to consider when using these calculations. As stated above, extremes of age and body build can adversely affect the results. Plus, you also need to remember that muscle mass burns a lot of calories; whereas, fat burns none. So, if you are particularly lean and muscular, your BMR will be substantially higher than the formulas indicate. Conversely, being overweight will result in a lower number.
To get just a rough calculation of your BMR, go online and do a search using that abbreviation. There are many websites that have a calculator available; some even use imperial/English units rather than metric. Merely type in your age, height, sex and weight, and it'll give you a rough metabolic number. It's not flawless, but it's a starting point.
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Learn how to figure your metabolic rate.
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