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Difference between RER and RQ

Difference between RER and RQ

There are a few different ways to measure respiratory exchange, each with its own benefits and drawbacks. The two most common respiratory exchange ratios are RER and RQ. This article will define each ratio and explain the difference between them. By understanding the differences between these metrics, you can select the one that is best suited for your needs.

What is RER?

RER, or respiratory exchange ratio, is a measure of the amount of oxygen that is used by the body during exercise. RER is typically expressed as a percentage of oxygen used to carbon dioxide produced. For example, an RER of 0.70 indicates that 70% of the oxygen used by the body is converted to carbon dioxide. RER can be used to assess the level of intensity at which a person is working out. Generally, the higher the RER, the harder the person is working. RER can also be used to monitor changes in fitness level over time.

What is RQ?

RQ is the ratio of carbon dioxide produced to the oxygen used by an organism. RQ can be used to measure the rate of metabolism of an organism and is a useful tool for researchers studying energy expenditure. RQ values can vary depending on the type of food being metabolized, with carbohydrates yielding a lower RQ than fats. RQ can also be affected by exercise, as muscles use more oxygen during exercise and produce more carbon dioxide. By measuring RQ, researchers can gain insights into the energy expenditure of an organism and identify ways to improve performance.

Difference between RER and RQ

The respiratory exchange ratio (RER) and respiratory quotient (RQ) are two ways of measuring the efficiency of respiration. RER is a measure of the ratio of carbon dioxide produced to oxygen consumed, while RQ is a measure of the ratio of carbon dioxide produced to the carbon dioxide exhaled. RER is generally considered to be a more accurate measure of respiratory efficiency, as it takes into account all of the sources of carbon dioxide production.

However, RQ may be more useful in some circumstances, such as when assessing the energy expenditure of athletes during exercise. In conclusion, RER and RQ are two different ways of measuring respiration, with RER being more accurate but RQ being more practical in some situations.


In conclusion, RER and RQ measure different things. RER measures the ratio of carbon dioxide production to oxygen consumption, while RQ measures the ratio of carbohydrate oxidation to fat oxidation. Knowing the difference between these two ratios can be helpful for athletes and people who are trying to lose weight.

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