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This is when the blood sugars fall too low. Participation in sport can increase the risk of having an attack. This is why people with diabetes must monitor glucose levels before and after activity.

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Diabetes occurs when a person's body cannot regulate the amount of glucose in the blood. There is a lack of insulin, or insulin function, so the glucose remains in the blood rather than travelling to the cells. Therefore, diabetes impacts on the amount of energy we can use from the food fuel carbohydrates.

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The ATP-PC recovery time is 2-3 minutes. This is because energy is needed from one of the other systems to replenish the PC stores of the body.

The lactate system has a recovery time of approximately 8 minutes. This aids the removal of lactic acid and also gives the body time to replace the glycogen stores in the muscle cells.

The aerobic system recovery time can vary from 2-3 hours to 3 days. This depends on the intensity, duration and the individual's fitness levels.

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- Increased ability to use fats as a food fuel source.
- Increased storage of glycogen.
- Increased  umber of mitochondria.
Each of these adaptations increases our potential for aerobic energy production.

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This systems adapts by building up a tolerance to lactic acid, therefore the muscles do not become fatigued as quickly which extends the length of time this energy system can be used without needing recovery.

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Although it is a very fast energy production system, it is limited by the stores of PC. If the body is able to store more creatine, this will allow the system to be used for longer.

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- Longer duration
- Low to medium intensity
- Slow twitch muscle fibres

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- Short duration
- High intensity
- Fast twitch muscle fibres

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There are three energy systems:
- ATP-PC
- The lactate system
- The aerobic system
Each work in a slightly different way, although all resynthesize ATP.

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Energy cannot be created or destroyed, but we can change its form. The fats and carbohydrates we eat contain energy - this is our food fuel sources.

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ATP stands for adenosine tri-phosphate and is the only form of energy that the body can use for muscle contraction.