Understanding the Basal Metabolic Rate (BMR)
Your basal metabolic rate (BMR) represents the number of calories your body burns at complete rest to perform basic, life-sustaining functions such as breathing, circulation, and cell production. It is often confused with Resting Metabolic Rate (RMR), which is the number of calories your body burns at rest, but includes the energy for minimal daily activity like getting dressed. BMR accounts for the majority of a person's total daily energy expenditure, and knowing this number is a foundational step for anyone trying to manage their weight or optimize their nutrition.
The Most Widely Accepted BMR Equation
The Mifflin-St Jeor equation, developed in 1990, is the modern and most widely recommended equation for calculating BMR. For more details on the specific formulas for men and women and how to apply the equation, please refer to {Link: MedicineNet https://www.medicinenet.com/what_is_the_formula_to_calculate_bmr/article.htm}.
Comparison of BMR Equations
To understand why the modern formula is preferred, a comparison with other equations is helpful. {Link: MedicineNet https://www.medicinenet.com/what_is_the_formula_to_calculate_bmr/article.htm} provides a table detailing features like development date, accuracy, inputs, and key considerations for the Mifflin-St Jeor, Revised Harris-Benedict, and Katch-McArdle formulas.
Factors that influence your BMR
An equation provides a general estimate, but several factors influence an individual's BMR. These include body composition, age, genetics, gender, pregnancy, and climate.
How to use your BMR calculation for health goals
Once you have calculated your BMR, you can use it to determine your Total Daily Energy Expenditure (TDEE), the total calories burned daily including activity. Multiply your BMR by an activity factor for a personalized calorie estimate for weight management.
Here are general activity factors:
- Sedentary: BMR x 1.2
- Lightly Active: BMR x 1.375
- Moderately Active: BMR x 1.55
- Very Active: BMR x 1.725
- Extra Active: BMR x 1.9
Conclusion
Understanding what equation is used to calculate BMR is a valuable first step in managing your health. The Mifflin-St Jeor equation provides a modern and reliable calculation considering age, sex, weight, and height. This BMR figure is a baseline that can be used with activity factors to estimate your total daily energy needs. For personalized advice, consulting a healthcare professional is recommended. For more detailed information on BMR calculations, including the specific formulas and comparisons with other methods, visit {Link: MedicineNet https://www.medicinenet.com/what_is_the_formula_to_calculate_bmr/article.htm}.
