Topical Terminology > Respiratory Exchange Ratio
1 Definition
Respiratory Exchange Ratio
For Respiratory Exchange Ratio we have a term and definition in Fitness Testing.
Respiratory Exchange Ratio (Fitness Testing) 
The ration of the amount of carbon dioxide produced by the body to the amount of oxygen consumed. At rest it ranges from 0.6 to 1.0 depending on what fuels the body is using. During exercise, it may go above 1, and can be used to measure anaerobic threshold and indicate when VO2max is reached.
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