Basal metabolic rate (BMR) refers to the energy metabolic rate of the human body when it is awake and extremely quiet, which is not affected by muscle activity, environmental temperature, food and mental stress. That is, when the basic physiological activities (that is, blood circulation, respiration and body temperature are constant), the minimum heat consumption per hour per unit surface area is MINUS the standard heat consumption, and the percentage of the difference and the standard heat consumption is called the basal metabolic rate.
To measure basal metabolic rate, lie still for half an hour before breakfast in the morning (but keep awake), keep the room temperature at about 20℃, and measure it by indirect calorimetry. The unit of basal metabolic rate is kj/(m2 h) (kj/m2/hour), that is, the number of kilojoules of heat released per square meter of body surface per hour.
There are many formulas for calculating basal metabolic rate, corresponding to different methods. Only three methods are mentioned here, and the most commonly used method is the first one.
When calculating, it is more reliable to take the average of the results of the following formula:
(1) basal metabolic rate% = (pulse rate+pulse pressure difference)-11(Gale method).
(2) basal metabolic rate% = 0.75 × (pulse rate+pulse pressure difference × 0.74)-72 (Reed method).
(3) Basal metabolic rate% = 1.28 × (pulse rate+pulse pressure difference)-1 16(Kosa method).