Physical Education - Oxygen debt
* O2 debt 
When you finish exercising, energy demands decrease. However, the amount
of oxygen required by the body remains above resting levels. This is known
as oxygen debt.
There are two components:
- refers to the restoration of PC stores (complete in only 3 minutes).
- refers to the removal and breakdown of lactic acid from the muscles
and blood. This takes much longer - approximately 2 hours.
What is the time taken for PC replenishment (what is the role of oxygen
70% - 30 seconds
90% - 90 seconds
100% - 3 minutes
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