An oxygen deficit occurs

There is an oxygen deficit when an oxygen intake exceeds its intake in the body. During strenuous exercise, oxygen deficits occur naturally. The body works to fill up oxygen levels during the so - called regeneration period, when the drill is responsible for oxygen deficits.

A second definition comes from Work Place Testing: "Oxygen deficit exists when a body's consumption of oxygen exceeds its intake." Oxygen deficit occurs naturally during strenuous exercise. When exercise triggers an oxygen deficit, the body will work to replenish oxygen levels during what is known as a recovery period.