The respiratory exchange ratio is often referred to as the respiratory quotient during steady-state exercise.

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The terms respiratory exchange ratio (RER) and respiratory quotient (RQ) are often used interchangeably, but RER is usually used during exercise when the body is not in a steady state. During steady-state exercise, RQ is more commonly used as it reflects the ratio of carbon dioxide production to oxygen uptake at the cellular level.

The Respiratory Exchange Ratio Is Often Referred to as the Respiratory