Respiratory Exchange Ratio

Last updated: February 18, 2021

What Does Respiratory Exchange Ratio Mean?

Respiratory exchange ratio refers to the cyclical process of the cardiopulmonary system to generate a single breath and involves the proportional interaction of oxygen uptake to carbon dioxide expulsion. This formula determines the rate of metabolic energy expended per unit of time when measured by beats per minute. It is an effective means to evaluate aerobic capacity during strenuous activity. It measures how efficiently the lungs function within a single breath during exercise.


WorkplaceTesting Explains Respiratory Exchange Ratio

Respiratory exchange ratio assesses the relative function of the cardiopulmonary system to produce a single breath based on the proportional rate of oxygen uptake and carbon dioxide removal in the blood. This process determines the body’s ability to metabolize energy per unit of time measuring the cumulative sum of oxygen absorption and its carbon dioxide byproduct within muscle tissue. Aerobic exercise is a standard means to evaluate the respiratory exchange ratio when evaluating cardiopulmonary fitness.


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