Endocrine glands – the secretion of the endocrine glands are the principal regulators of the metabolic rate.This is due to muscular relaxation and decreased activity of the sympathetic nervous system. Sleep – the metabolic rate falls approximately 10 to 15% below that of waking levels.State of nutrition – a decrease in mass of active tissue like in undernourishment or starvation causes a lowered metabolism often as much as 50% below normal.Athletes with great muscular development show about 5% increase in basal metabolism over non-athletic individuals. Body composition – a large proportion of inactive adipse tissue lowers the BMR.The BMR declines slowly with increasing age to lower muscle tone from lessened activity. Age- the metabolic rate is highest during the periods of rapid growth, chiefly during the first and second years and reaches a lesser peak through the ages of puberty and adolescence in both sexes.Women have a little more fat and less muscular development than men. Sex – women, in general, have a metabolism of about 5 to 10% lower than men even when they are of the same weight and height.
Muscle tissue requires more O2 than does adipose tissue.
#Bmr formula skin
Surface area – the greater the body surface area or skin area, the greater the amount of heat loss will be, and in turn, the greater the necessary heat produced by the body.It uses the following equation:Ī 50 kg man will have a REE of 1,459 kcal.īody Weights In Kg And Metabolic Body Size (kg) ¾įactors that Affect the Basal Metabolic Rate (BMR) The fourth method is that developed by WHO/FAO/UNU in 1984. Once the metabolic body size is known based on weight in kilograms, this figure is multiplied by 70.Ī 50 kg man’s REE = 18.8 x 70 = 1,326 kcalĤ.
#Bmr formula free
REE = 655 + + – ģ.Ěnother method used in obtaining the metabolic or fat free body size is called the Biologic Body Weight raised to the ¾ power. Harris-Benedict formula, developed in 1909, using information on weight, height, age and sex. This value however may not be applicable for obese or lean individuals.Ģ. An individual whose IBW is 50 kg has a basal metabolic energy need of 1200 kcal per day (50 x 1 kcal x 24 hrs). The environmental temperature should be between 20-25?C so that the subject can maintain his body temperature.ġ.Ě simple method for the calculation of the BMR is to use the rule of thumb 1 kcal per kg hour per adult male and 0.9 kcal per kg per hour for adult female.The subject must be awake, lying quietly, free form physical fatigue, nervousness or tension as this causes an increase in heat production.The subject must be in fasting or post-absorptive state, at least 12 hours after meals and it is usually taken in the morning.It constitutes one half of the calorie requirements of an individual.Is the rate of basal metabolism in a given person at a given time and situation.
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