For aerobic activity – Hardly any extra oxygen is consumed above what is needed at rest. And for anaerobic activity – Post exercise, a lot more oxygen is needed to restore the body to its resting state (breathing, circulation, digestion, hormones, etc.), and to adapt to the exercise by recovering and repairing from the microscopic tissue damage (anabolism). This is called oxygen debt (or oxygen debit these days) — also known as EPOC (Excess Post-exercise Oxygen Consumption) — or a more popular term, after-burn.
