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Edexcel GCSE Physical Education · 1PE0
Edexcel 1PE0 · 1.3.2 Check the specification (PDF) (opens in a new tab)
Working muscles need energy to contract and produce movement. , or fuels, from which the body releases this energy. The fuel is not the same thing as the energy-release process: aerobic and anaerobic describe how energy is released.
Aerobic energy release uses oxygen and supports sustained activity. Anaerobic energy release does not use oxygen and helps meet the demands of short, high-intensity efforts when oxygen supply cannot keep up with the muscles’ needs.
The body needs oxygen to release energy from fats, so fats are a fuel source for aerobic activity, not anaerobic activity. They are particularly useful during lower-intensity, sustained exercise, such as steady, gentle cycling.
This does not mean that an aerobic performer uses only fat. Carbohydrates can also supply energy aerobically.
Carbohydrates provide glucose that the muscles can use to release energy. Unlike fats, carbohydrates can fuel both aerobic and anaerobic activity.
During a sustained run, carbohydrates can release energy using oxygen. As the effort becomes more intense, carbohydrates are especially important. During a short, intense sprint, they can also supply energy anaerobically, when oxygen delivery cannot meet demand quickly enough.
| Fuel | Aerobic activity | Anaerobic activity |
|---|---|---|
| Fats | Yes | No |
| Carbohydrates | Yes | Yes |
Consider a footballer moving at a gentle pace and then sprinting up the wing. During the lower-intensity movement, aerobic energy release can use fats and carbohydrates. During the sprint, the increased anaerobic contribution uses carbohydrates, not fats.
Activities usually involve a mixture of aerobic and anaerobic energy release rather than an absolute switch between them. The key distinction remains the same: fats require aerobic energy release; carbohydrates can fuel both pathways.
| Energy release | Available fuels |
|---|---|
| Aerobic — uses oxygen | Fats and carbohydrates |
| Anaerobic — does not use oxygen | Carbohydrates |
When asked about aerobic fuels, name both fats and carbohydrates. For anaerobic activity, name carbohydrates.
Link the fuel to the demands of the activity: fats require oxygen, whereas carbohydrates can release energy aerobically or anaerobically.
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Last updated
Carbohydrate
A nutrient that provides fuel for both aerobic and anaerobic activity.
Fat
A nutrient that provides fuel for aerobic activity; oxygen is required to release energy from it.
Aerobic activity
Physical activity in which energy is released mainly using oxygen, allowing sustained effort.
Anaerobic activity
High-intensity physical activity in which energy is released without using oxygen, supporting short bursts of effort.
Put your knowledge into practice — try past paper questions for Physical Education
Carbohydrate
A nutrient that provides fuel for both aerobic and anaerobic activity.
Fat
A nutrient that provides fuel for aerobic activity; oxygen is required to release energy from it.
Aerobic activity
Physical activity in which energy is released mainly using oxygen, allowing sustained effort.
Anaerobic activity
High-intensity physical activity in which energy is released without using oxygen, supporting short bursts of effort.