Basal Metabolic Rate (BMR) & Resting Metabolic Rate (RMR)
Basal metabolic rate (BMR) is the amount of energy expended while at rest in a neutrally temperate environment, in the post-absorptive state (meaning that the digestive system is inactive, which requires about twelve hours of fasting in humans). The release of energy in this state is sufficient only for the functioning of the vital organs, such as the heart, lungs, brain and the rest of the nervous system, liver, kidneys, sex organs, muscles and skin.
BMR is measured under very restrictive circumstances when a person is awake, but at complete rest. An accurate BMR measurement requires that the person's sympathetic nervous system not be stimulated. A more common and closely related measurement, used under less strict conditions, is resting metabolic rate (RMR).
- Source: Wikipedia
There is minimal difference between BMR and RMR. Clinically, BMR is measured under very restrictive conditions, while RMR testing is much less restrictive.
Our calorie counters and calculators use RMR instead of BMR, because it is more reflective of real life situations with less restrictive conditions. As you can see from our RMR calculator on the left, 2 primary values are calculated: 1) RMR, and 2) RMR Sedentary.