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Aerobic system

When you exercise beyond the limits of your ATP-PC system and your lactic acid system the aerobic system comes into play. This system uses oxygen to breakdown carbohydrates (glucose), fats and proteins to release the energy needed to resynthesise ATP.

The aerobic system[D]

Energy to resynthesise ATP is provided by the breakdown of glucose, fats and proteins

This system is aerobic as it works without oxygen. It involves a variety of chemical reactions which produce carbon dioxide and water as waste products. This system is not as limited as it uses oxygen to help resynthesise ATP. It can therefore provide energy for significantly longer periods of time when working at a low to moderate intensity. It is therefore used for activities that are long in duration, for example long distance running, cycling, swimming and rowing. It is also used to supply the body with energy when at rest or recovering from exercise.