respiratory exchange ratio (RER or R)

(redirected from respiratory exchange ratio RER or R)

respiratory exchange ratio (RER or R)

the ratio of carbon dioxide released to oxygen taken in, by exchange between the body and the atmosphere, over a period of measurement by analysis of expired gases. Used in the estimation of oxygen consumption (O2) and from that the equivalent energy expenditure to allow calculation of the 'true' difference between inspired and expired oxygen percentage when the RER is other than 1:1. In a steady state (when carbon dioxide is neither being stored nor over-excreted by hyperventilation) RER is equal to the respiratory quotient which reflects the proportion of the different nutrients being used for energy production.
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