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What is the resting metabolic rate?

Resting metabolism rate (RMR) is the rate that the body burns calories (energy) whilst at complete rest. By calculating the RMR it is possible to see how many calories the body needs to perform basic functions such as breathing and circulation and to gain, maintain or lose weight.

How does the resting metabolic rate test work?

The measurement of the RMR is made by checking the amount of oxygen the body uses and how much carbon dioxide it produces. The oxygen is combined with carbohydrates and fats to make energy, which keeps the organs and tissues working. When the carbs and fats are broken down to make energy, carbon monoxide is produced.

How is the RMR test performed?

The patient is to relax in a chair whilst their oxygen uptake, carbon dioxide output and electrocardiogram (EKG) are measured for around 20 minutes. They will have to wear a face mask that covers the mouth and nose. Stickers and leads from the EKG are attached to the chest to monitor the heart rate and rhythm.

What do the results of an RMR test show?

The results of the test can tell the doctor if there is an increased or decreased metabolism and if the body primarily uses fats or carbohydrates for energy. This can determine how many calories a person needs to eat each day to maintain or lose weight. It can also indicate if there is a condition affecting the metabolism, such as diabetes, an under or overactive thyroid, heart disease and obesity amongst others. Some medications may also be influencing the RMR.

How should someone prepare for a resting metabolic rate test?

It is important to remain as relaxed as possible during the RMR test in order to get the best results. Most activities should be avoided beforehand and five hours before the test food and drink, besides water, should not be consumed. Loose clothing should be worn in order for access to the chest to connect the EKG.