basal metabolic rate

1. Basal metabolic rate
BY
Ramez Yousry

2. Basal metabolic rate vs. resting
metabolic rate
• Basal metabolic rate (BMR) is often used
interchangeably with resting metabolic rate
(RMR).

3. BMR
• minimum number of calories required for
basic functions at rest

4. RMR
• is the number of calories that your body burns
while it’s at rest.

5. BMR estimation formulas
• Mifflin-St Jeor Equation:
• For men:
• BMR = 10W + 6.25H - 5A + 5
• For women:
• BMR = 10W + 6.25H - 5A - 161

6. BMR estimation formulas
• Revised Harris-Benedict Equation:
• For men:
• BMR = 13.397W + 4.799H - 5.677A + 88.362
• For women:
• BMR = 9.247W + 3.098H - 4.330A + 447.593
• Katch-McArdle Formula:
• BMR = 370 + 21.6(1 - F)W
• where:
• W is body weight in kg
H is body height in cm
A is age
F is body fat in percentage

7. How many calories you need
everyday
• If you’ve estimated your BMR using the Harris-Benedict formula, your next
step is to include the number of calories you burn during daily activities
based on your lifestyle:
• Sedentary. If you get minimal or no exercise,
multiply your BMR by 1.2.

8. How many calories you need
everyday
• Lightly active. If you exercise lightly one to
three days a week, multiply your BMR by
1.375.

9. How many calories you need
everyday
• Moderately active. If you exercise moderately
three to five days a week, multiply your BMR
by 1.55.

10. How many calories you need
everyday
• Very active. If you engage in hard exercise six
to seven days a week, multiply your BMR by
1.725.

11. How many calories you need
everyday
• Extra active. If you engage in very hard
exercise six to seven days a week or have a
physical job, multiply your BMR by 1.9.

12. Ref
•Ability of the Harris Benedict formula to predict
energy requirements differs with weight history
and ethnicity 2007: Crystal C. Douglas, Jeannine
C. Lawrence, Nikki C. Bush, Robert A. Oster,
Barbara A. Gower, and Betty E. Darnell.