The Harris-Benedict equation (also called Harris-Benedict principle ) is the method used to estimate the level of individual basal metabolism (BMR).
The estimated BMR value can be multiplied by a number corresponding to the level of individual activity; the amount produced is an approximate daily kilocaloric intake to maintain current weight.
The Harris-Benedict equation can be used to help weight loss - by reducing the amount of kilocalorous intake below the estimated maintenance intake of the equation.
Video Harris-Benedict equation
Step 1 - Calculate the BMR Harris-Benedict
The original Harris-Benedict equation was published in 1918 and 1919.
The Harris-Benedictian equation was revised by Roza and Shizgal in 1984.
The 95% confidence range for men is Ã, Â ± 213.0 kcal/day, and Ã, Â ± 201.0 kcal/day for women.
The Harris-Benedictian equation revised by Mifflin and St Jeor in 1990:
Maps Harris-Benedict equation
Step 2 - Define Total Intake
While the original paper does not attempt to translate the BMR into total energy expenditure (TEE), the BMR results can be multiplied by factors close to the level of physical activity of the individual (PAL) to estimate their TEE. The following table enables an individualized TEE approach individually based on some lifestyle examples.
History
The Harris-Benedictian equation stems from a study by James Arthur Harris and Francis Gano Benedict, published in 1919 by the Carnegie Institution of Washington in the A Biometric Biometric Study of Basal Metabolism in Humans. The 1984 revision enhanced its accuracy. Mifflin et al. published a more predictive equation for modern lifestyles in 1990. Then work produces BMR estimators that contribute lean body mass.
Problems with dieting
Because the BMR equation does not try to account for body composition, identical results can be calculated for very muscular people, and very obese people, who have the same height, weight, age and gender. Since muscles and fats require different amounts of calories to maintain, the TEE estimate will not be accurate for such cases.
The paper behind the recent update (Mifflin et al) for the BMR formula states all participants in their study fall into the category of body mass index (BMI) 'normal' and 'overweight', and therefore the results are not always applicable to them. in the BMI category of 'emaciated' or 'obese'.
See also
- Food energy
- Basal metabolic rate
- Resting metabolic rate
Source cited
External links
- The Harris-Benedict BMR Calculator on WebMD
- About.com BMR Calculator
Source of the article : Wikipedia
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