Resting Metabolic Rate (RMR) testing is the measurement of how much food, or energy, is required to maintain basic body functions such as heartbeat, breathing and maintenance of body heat while you are in a state of rest. That energy is expressed in calories per day. So an RMR test shows how many calories you burn at rest, doing nothing more than sitting in a chair.



An RMR test helps you understand how much you need to eat in order to achieve your goals.  Knowing your RMR enables you to:

  • Set accurate individualized caloric targets to help you lose, gain or maintain weight;
  • Verify if your training or nutrition program has increased or decreased your metabolism; and
  • Compare the speed of your metabolism to others of your gender, age, height and weight.



Indirect calorimetry (a measurement of metabolic rate) relies on the fact that burning 1 calorie (Kilocalorie) requires 208.06 milliliters of oxygen. Because of this very direct relationship between caloric burn and oxygen consumed, measurements of oxygen uptake (VO2) and caloric burn rate are virtually interchangeable.

Oxygen uptake requires a precise measurement of the volume of expired air and of the concentrations of oxygen in the inspired and expired air. The process requires that all the air a person breathes out be collected and analyzed while they rest quietly. The RMR testing equipment used by FRC contains a precision air flow sensor that measures the volume of expired air, and an oxygen sensor that measures the concentration of oxygen. In preparation for an RMR test, you will be asked to avoid eating a meal for 4 hours before the test, to avoid exercising on the day of the test and to avoid the use of stimulants such as caffeine prior to the test.  In order for the test to be conducted, it is important for you to be as comfortable as possible.  You will be asked to place a nose clip over your nose and a mouthpiece in your mouth which you must keep sealed at all times around the edges.  The mouthpiece is disposable and will not be reused and all equipment is thoroughly cleaned before and after each use.  The test will take approximately 10 minutes after which the FRC manager administering the test will provide you with your results and an explanation of how you can use them to find your formula!

If you are ready for your RMR assessment, please click on the button below and fill out the contact information on our “Contact Us” page or simply call or email us so that we can get you scheduled today!