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Respiratory exchange ratio 

Respiratory exchange ratio
Respiratory exchange ratio

William Kinnear

and John Blakey

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date: 20 April 2021

The Respiratory Exchange Ratio (RER) is the ratio of VCO2/VO2 Beyond the Anaerobic Threshold, the RER increases above 1.0: VCO2 rises more steeply, reflecting the production of CO2 from buffering of lactic acid, whereas VO2 – by definition – cannot increase. Subjects with dysfunctional breathing have erratic RER traces

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