During exercise, a respiratory exchange ratio (RER) of 1 indicates that:

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Answer

Proteins and carbohydrates are equally contributing fuel sources for the athlete (main energy substrate)

Answer

Fat is the main source of fuel for the athlete (main energy substrate)

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Carbohydrate is the main source of fuel for the athlete (main energy substrate)

Answer

Fats and carbohydrates are equally contributing fuel sources for the athlete (main energy substrate)

Answer

Protein is the main source of fuel for the athlete (main energy substrate)

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