Algonquin College Health Program Assessment (AC-HPAT) Practice Exam

What causes an oxygen debt in the body?

1. Aerobic exercise

2. Rest

3. Anaerobic exercise

4. Overhydration

The correct answer is: Anaerobic exercise

Oxygen debt refers to the amount of oxygen that the body must consume after exercise to restore itself to its pre-exercise state. It occurs primarily as a result of anaerobic exercise, which is characterized by high-intensity activities that require quick bursts of energy. During anaerobic exercise, the body relies on energy sources that do not require oxygen, leading to the production of lactic acid and a temporary shortage of oxygen available for cellular processes. This results in an oxygen debt because, after the activity, the body works to convert the accumulated lactic acid back into usable forms and replenish oxygen levels in the muscles and blood. As a person engages in anaerobic activities, such as sprinting or heavy lifting, the demand for immediate energy exceeds the supply of oxygen available for aerobic metabolism. Consequently, the body enters a state where it must recover post-exercise by increasing oxygen intake to meet the physiological needs created by the activity. Other options provided do not induce oxygen debt in the same way. Aerobic exercise utilizes oxygen more efficiently and promotes steady energy production, while rest allows the body to recover without creating any additional demand for oxygen. Overhydration can lead to issues with electrolyte balance and might affect performance but does not directly create an oxygen deficit. Thus,