The Basal Metabolic Rate (BMR) is the energy expenditure in complete rest necessary to maintain wakefulness and the normal functioning of all vital processes of our body such as breathing, blood circulation, nervous system activity and many others.
The basal metabolic rate is influenced by a myriad of factors such as body temperature, muscle mass, age, hormonal factors, sex, outdoor temperature, use of drugs, etc.
It was shown, for example, that the basal metabolism in women is lower than the 5-10% than in men and after 25-30 years of age decreases of 2-5% per decade.
Also, since BMR is influenced by external temperature, its value must be calculated at an environment temperature, between 20 and 27 degrees.
There are many formulas for calculating the basal metabolism, all derived from studies done on millions of individuals and in various conditions.
The calculator on this site makes use of some of these formulas, showing the value of the Basal Metabolic Rate and the name of the author who created the formula.
Provide the height, weight, age, and sex to the calculator and in seconds you will know your metabolic baseline.
For all people in good health and with normal values of vital signs, the result provided by this tool is quite true. Conversely, in cases of, for example, considerably overweight or with specific physiological problems, the result can not be trusted.
In both cases, however, a thorough medical examination and a series of clinical tests will yield a value of the Basal Metabolic Rate that comes closest to reality.
Out of curiosity:
- more than 70% of energy expenditure in human body comes from the basal job of the various organs. For example, liver has a 27% of energy expenditure breakdown, brain about 20%, heart just 7%.
We spend about 20% of energy in physical movements and about 10% in so-called thermogenesis.
- some studies say that twenty minutes of cardiovascular training per day can temporarily increase the basal metabolic rate by around 10%.
- The metabolism varies with physical condition and activity. It sounds like weight training can have a longer impact on metabolism than aerobic training. Still it's not certain as there are not mathematical formulas that can predict it.
- When you decrease the food intake it seems that metabolic rate decreases more than 10%. It sounds like body tries to do not waste energy.
- It seems that metabolic rate can be raised in stress, illness, diabetes, and menopause.
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