Aerobic Energy System

just some notes from revision, hope it helps

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Sports studies Unit 3 section 1
Aerobic energy systems
To move we need to contract muscles
To contract our muscles we need energy
Energy comes from food
Food is broken down into chemicals
Chemical broken down to provide energy (chemical energy)
Adenosine Triphosphate (ATP)
Immediate usably form of energy needed by muscles.
ATP is broken down to produce energy.
Energy is needed to resynthesise or rebuild ATP
When ATP is broken down it produces Adenosine triphosphate, phosphate and energy.

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When we use ATP we have to resynthesised it straight away as we do not have a store of
ATP In the body.
ATP can be resynthesised from three different types of chemical reactions
These take place in the muscles cells
Two rely on the food we eat, the third relies on a chemical called phosphor creatine.
Chemical reactions with oxygen are Aerobic.…read more

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Fats Proteins…read more

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Some of our food sources are inconvertible; we can convert them
one way but not the other.
Some conversions easier than others
Easy to convert glucose to fat but not so easy to turn fat into
glucose.…read more

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Breakdown of glycogen, glucose and fats will leave Co2 H2o and
energy for ATP resynthesis
Atp production occurs in mitochondria (organelles within a cell)
Muscle cells have a large number of mitochondria
Advantages of aerobic ATP production:
+no fatiguing by-products
+the starting chemicals are in abundant supply and will rarely
run out
+Far more ATP is produced aerobically than anaerobically
Takes place in the sarcoplasm of muscle cells…read more

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Krebs cycle:
1. Pyruvic acid added to coenzyme A COA to become Acetyl
2. Krebs cycle
3. Acetyl CoA is oxidized to carbon dioxide, the hydrogen
atoms are transferred to the Electron Transport chain.
4.…read more

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Can be used in exercise when the activity is continuous and
lasts for over an hour.
Training increases our ability to take in oxygen and therefore
makes this process more effective
Fat has more carbon bonds than glycogen and therefore need
more oxygen to breakdown.
Excess fat stores add extra weight which must be carried
Breaking down fat requires the presence of carbohydrates.…read more

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Cardiac hypotrophy
Increased resting stroke volume
Increased blood volume and hemoglobin
more oxygen can be stored in the blood as a result of hemoglobin
and more free fatty acids can be transferred faster as a result of
both increased blood vol and cardiac hypertrophy
Increased muscle stores of glycogen and triglycerides
Increased number and size of mitochondria- more ATP
resyntheis can occur
As a result of all of these maximal oxygen consumption (V02 Max)
Oxygen consumption
The amount of oxygen needed…read more

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When we begin to exercise we cannot take in oxygen so
produce ATP anaerobically
At the beginning of exercise oxygen consumption is lower
than the required amount.…read more

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Training effects:
Training can increase V02 Max between 5-10%
Effects of training will vary depending on the gentics of the
individual the intensity of the exercise and the lengh in which the
training regime is undertaken
Blood vol increases
Heamoglobin levels increase
Atroke volume will increase
Cariac hypertrophy
Muscle fibres can use oxygen more efficiently to resynthesise
Number of mitochondria in muscles increases
Increased cappiliasration of muscles
Increased lactic acid tolerance…read more


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