Acute and Chronic Energy System

Acute responses:
When we breath air it enters our blood through the alveoli in our lungs and is absorbed by the hemoglobin in our blood which our heart then pumps around the body into our muscles and cells. Inside the cells in the muscle, mitochondria an organelle cell is found which turns the oxygen into  ATP which is then used as fuel and energy for the body.

Creatine phosphate energy system
This energy system gives instant energy and is used for exercises that are short burst such as sprinting or bowling in cricket (the execution phase). The primary source of this system is ATP and it is boosted by Creatine. Creatine is taken by professional runners such as Usain Bolt; the Creatine stored in his muscles increase the energy therefore when the ATP is about to finish Creatine helps resynsthesize the ATP. More Creatine means Usain Bolt will be able to run faster and work at a high intensity. As the Creatine starts to finish finish the Lactic acid system starts to take over.

Lactic Acid energy system
This energy system is a short term energy system, not as short as the Creatine phosphate system. It is mostly suitable for runners such as 400 m or 800 m because they have to use the oxygen in their body and work aerobically, while making the oxygen there is lactic acid being produced which the athlete's body has to cope with. The athlete needs to use have a good cool down to get rid of the lactic acid that was produced while they were running. When this process is about to run out, the aerobic energy system starts to overlap or may start before the lactic acid has even finished. 

Aerobic energy system
This energy system is used by long distance runners or marathon runners as because they have to use the oxygen in their body and work aerobically. As the long distance runners work at a constant pace they don't require burst of energy, they just have to use the oxygen that is provided by the body. When your body is working at a slow pace it uses the fat as a energy source  and it gets broken down by the enzymes; but if you speed up you would change back to the lactic acid system.

chronic energy system:

The body starts using more fatty acid than glycogen (glucose) during aerobic exercise.; the benefits of this is that rather than using the carbohydrates in the body the stored up fatty acids are being used which is providing more energy for the athlete and giving them the intensity to work for longer. The second adaptation that happens is the number of mitochondria increases, this is beneficial because it makes more energy for the athlete which allows them to work for more longer and lets them work aerobically longer. Then the body adapts tolerance to lactic acid, this helps the athlete to keep working at a high intensity with the aerobic system.