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What does it mean when someone has gone into oxygen debt?

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Oxygen Debt is the informal term for the condition of Excess post-exercise oxygen consumption , or the state of increased respiration after a period of strenuous labor. In simple terms, this is the period after exercise or other exertion when the body has used a significant portion of its blood-oxygen mix in order to create movement, and needs to increase its intake of oxygen to replenish that...

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