BMR_Calculation v.1
Basal metabolic rate (BMR) is the amount of energy (kcal/day) that a person needs to keep the body functioning at rest. It is estimated from different equations using weight (kg), height (cm), age (years) and gender (male vs female). The Harris–Benedict, revised Harris–Benedict, and Mifflin St Jeor equations use weight, height, age and gender; the Schofield equations use weight, age and gender; while the Katch-McArdle/Cunningham equation uses lean body mass (LBM) only.
BMR is used in determining an individual's daily caloric needs as well as in developing and modifying nutritional plans.
To calculate Basal Metabolic Rate [BMR] (also Resting Daily Energy Expenditure, [RDEE] and Resting Metabolic Rate [RMR]) using; Harris–Benedict equations: BMR = 66.4730 + ( 13.7516 x weight in kg ) + ( 5.0033 x height in cm ) - ( 6.7550 x age in years ); for males BMR = 655.0955 + ( 9.5634 x weight in kg ) + ( 1.8496 x height in cm ) - ( 4.6756 x age in years ); for females (Revised) Harris-Benedict equations: BMR = 88.362 + ( 13.397 x weight in kg ) + ( 4.799 x height in cm ) - ( 5.677 x age in years ); for males BMR = 447.593 + ( 9.247 x weight in kg ) + ( 3.098 x height in cm ) - (4.330 x age in years ); for females Schofield equations: Age (years) Equation (kcal/day) Standard error of estimation (SEE) - for males: < 3 59.512 × W - 30.4 70 3–10 22.706 × W + 504.3 67 10–18 17.686 × W + 658.2 105 18–30 15.057 × W + 692.2 153 30–60 11.472 × W + 873.1 167 60 11.711 × W + 587.7 164 - for females: < 3 58.317 × W - 31.1 59 3–10 20.315 × W + 485.9 70 10–18 13.384 × W + 692.6 111 18–30 14.818 × W + 486.6 119 30–60 8.126 × W + 845.6 111 >60 9.082 × W + 658.5 108 - Schofield standard error of estimation (SEE) represents a confidence interval (+/-) for the Schofield BMR, so that calculated Schofield BMR is adjusted upwards (+ SEE) in leaner muscular individuals and individuals at the younger end of the age range equations; and adjusted downwards (- SEE) in obese individuals and individuals at the older end of the age ranges. Mifflin St Jeor equations: RMR = 9.99 x weight (kg) + 6.25 x height (cm) - 4.92 x age(years) + 5; for males RMR = 9.99 x weight (kg) + 6.25 x height (cm) - 4.92 x age (years) - 161; for females Katch-McArdle/Cunningham equation: RDEE = 370 + (21.6 x LBM), where LBM = lean body mass in kg. BMR may be over or under estimated by up to 20% depending on body fat content, weight training, stress, illness, drugs, food intake, altitude, enviromental temperature and even menopause.
Consider factors that may lower or increase BMR.
Harris JA, Benedict FG. A biometric study of human basal metabolism. Proceedings of the National Academy of Sciences. 1918 Dec 1;4(12):370-3. Roza AM, Shizgal HM. The Harris Benedict equation reevaluated: resting energy requirements and the body cell mass. The American journal of clinical nutrition. 1984 Jul 1;40(1):168-82. Schofield WN. Predicting basal metabolic rate, new standards and review of previous work. Human nutrition. Clinical nutrition. 1984 Dec;39:5-41. Mifflin MD, St Jeor ST, Hill LA, Scott BJ, Daugherty SA, Koh YO. A new predictive equation for resting energy expenditure in healthy individuals. The American journal of clinical nutrition. 1990 Feb 1;51(2):241-7. Henry CJ. Basal metabolic rate studies in humans: measurement and development of new equations. Public health nutrition. 2005 Oct 1;8(7a):1133-52. McArdle WD, Katch FI, Katch VL. Essentials of exercise physiology. Lippincott Williams & Wilkins; 2006.
OBSERVATION.body_weight.v2, OBSERVATION.height.v2, OBSERVATION.basic_demographic.v1, OBSERVATION.basal_metabolic_rate.v1, OBSERVATION.lean_body_mass.v1
