What is oxygen debt (EPOC) and how is it repaid after exercise?

• A. The extra oxygen required after exercise to restore ATP/PCr, clear lactate, and return the body to baseline; repaid during rest with continued elevated ventilation and metabolism.
• B. The total amount of oxygen consumed during the exercise itself.
• C. The oxygen needed to replenish blood oxygen carrying capacity during exercise only.
• D. The oxygen debt is repaid only by rapid breathing during activity.

Answer: (A)