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Basal Metabolic Rate

Basal Metabolic Rate. Human Biology 11. What Is Your BMR?. Your BMR measures the minimum calorie requirement your body needs to stay alive in a resting state It is the amount of calories your body would need if you were to stay in bed all day. How Many Calories Is This?.

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Basal Metabolic Rate

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  1. Basal Metabolic Rate Human Biology 11

  2. What Is Your BMR? • Your BMR measures the minimum calorie requirement your body needs to stay alive in a resting state • It is the amount of calories your body would need if you were to stay in bed all day

  3. How Many Calories Is This? • About 70% of your calorie intake is responsible for just supplying your BMR • You need calories to: • Pump your heart • Breathe • Control your body temperature • Any many other things

  4. Do We All Have The Same BMR? • We all have different BMR and there are many things that will affect what that rate is • Your BMR is the largest factor in determining your overall metabolic rate (how your body burns calories)

  5. Genetics • Some people are born with slower metabolisms than others • Some people are born with faster metabolisms than others

  6. Gender • Men have a greater muscle mass and a lower body fat percentage (10-15% higher BMR than womem) • The higher your muscle mass, the higher your metabolism

  7. Age • Your BMR will reduce as you age • After 20 years of age, your BMR drops about 2% every year

  8. Weight • The more you weigh, the higher your BMR • The BMR of an obese woman is 25% higher than a woman of an appropriate weight

  9. Body Surface Area • The greater your body surface area, the higher your BMR • Tall, thin people have higher BMRs

  10. Body Fat Percentage • The lower your body fat percentage, the higher your BMR

  11. Diet • If you reduce your calorie intake suddenly, your BMR can drop by 30% • Your body wants to ensure that it is always has the calories it needs to survive, so cutting calories quickly will switch your body into a “survival” mode

  12. Body Temperature • For every 1 degree increase in your body temperature, your BMR increases by approximately 14% • Chemical reactions occur faster in your body at higher temperatures • You burn a lot more calories while you are sick or have fever

  13. External Temperature • Exposure to cold temperatures will increase your BMR • Prolonged exposure to heat will also increase your BMR

  14. Glands • Your thyroid gland (butterfly-shaped gland in your neck) is responsible for making thyroxin • The more thyroxin produced, the higher your BMR

  15. Exercise • Exercise helps to build lean muscle tissue • The more lean muscle tissue, the higher your BMR • This means you will burn more calories – even when you are sleeping!

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