The basal metabolic rate varies with gender and age. The average basal metabolic rate of men is higher than that of women, and that of children is higher than that of adults. The older you get, the lower your metabolic rate is. Generally speaking, the difference between the actual value of basal metabolic rate and the normal average value is within 10- 15%.
When it exceeds 20% of the normal value, it can be considered as a pathological state. In hypothyroidism, the basal metabolic rate is 20-40% lower than the normal standard; In hyperthyroidism, the basal metabolic rate is 25-80% higher than the normal standard. When other functions such as adrenal cortex and pituitary gland are low, the basal metabolic rate will also decrease.
Extended data:
Measurement method
According to the above measurement principle and continuous research and testing, researchers at home and abroad have summarized three methods to measure BMR: direct calorimetry, indirect calorimetry and formula inference. The first two methods are the "gold standard" to measure energy consumption, while the formula inference method is simpler and faster than the first two methods, and is suitable for estimating BMR of large sample population.
Direct calorimetry
Direct calorimetry is to put the subjects in a special test environment, collect the total heat emitted by the subjects in a certain period of time (through radiation, conduction, convection and evaporation), and then convert it into the metabolic quantity per unit time, that is, the energy metabolic rate. However, the device for directly measuring heat is more complicated, and it is mainly used to study obesity and endocrine system disorder. The latter two methods are mainly used to measure the general population.
Baidu encyclopedia-basal metabolic rate