Briefly explain how the respiratory exchange ratio is used to estimate which substrate is being utilized during exercise. What is meant by the term nonprotein r?
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Only during steady-state exercise are the VCO2 and VO2 reflective of metabolic exchange of gases in tissues. Fat and carbs differ in the amount of O2 used and CO2 produced during oxidation. Nonprotein R of .85 represents a condition wherein fat and carbohydrate contribute equally as energy substrates.
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