Table of Contents
What does the Harris Benedict equation tell us?
The Harris Benedict equation is a calorie formula using the variables of height, weight, age, and gender to calculate basal metabolic rate (BMR). This is more accurate than calculating calorie needs based on total body weight alone.
Is the Harris Benedict equation accurate?
Of the predictive equations tested, the Harris-Benedict equation (mean difference: -14.8 kcal/day, RMSPE: 195.8 kcal/day, mean % difference: 0.1%) was the most accurate and precise, but accuracy in prediction of the equation were only 35.7%.
How accurate is the BMR formula?
Your BMR is a more accurate way to measure your metabolism at complete rest. It’s usually slightly lower than your RMR. Your RMR is a better number to reference for your daily calorie needs. It more accurately represents the calories you burn in a typical day.
How many calories do I burn resting?
You start with the number of calories your body burns at rest (called basal metabolic rate). BMR varies depending on mass, height, and age (you can determine yours with this calculator), but on average, this has been found to be about 45 calories per hour.
Should we still use the Harris and Benedict equations?
Resting metabolic rate (RMR) is commonly predicted using the Harris-Benedict (HB) equations, but an overestimation of 10% to 15% is normally found. More recent studies have proposed equations with a better predictive value.
How is Harris Benedict RMR calculated?
Harris and Benedict Equation
- Men: 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) – (5.677 × age in years)
- Women: 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) – (4.330 × age in years)
How is BMR formula derived?
BMR was derived using three methods: Harris-Benedict equation, Bioelectrical Impedance Analysis and Indirect Calorimetry.
What weight is used in Harris-Benedict equation?
In men, the Harris-Benedict equation formula used was: BMR=66.4730 + 13.7516 x weight in kg + 5.0033 x height in cm – 6.7550 x age in years. In women, BMR=655.0955 + 9.5634 x weight in kg + 1.8496 x height in cm – 4.6756 x age in years.
What is the formula for energy output?
To calculate electrical power, use the formula Power = Current × Voltage.
Why is BMR not accurate?
You’ll need to sleep at the lab overnight to get an accurate BMR measurement. The number of hours you sleep and the temperature of the room can affect your BMR. You may need to skip exercise and eating for at least 12 hours beforehand. These activities both burn extra calories over time.
Why is BMR inaccurate?
Think of it as your body’s minimum fuel requirement to maintain business as usual. However, your BMR can vary dramatically from another person who is the same age, height and weight as you. This is because there are many variables that affect how your body uses energy.
What is BMR and BMI?
The abbreviations BMI and BMR sound similar, but they stand for two separate things. Your BMI, or body mass index, is a number calculated from your height and weight which is then used to assess your body composition. Your BMR, or basal metabolic rate, is the number of calories you burn when your body is at rest.