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When an ATP molecule is combined with water the last of three phosphate groups splits apart and produces energy.

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During the first few seconds of exercise regardless of intensity, the ATP-PC system is relied on almost exclusively, with energy coming from the breakdown of the ATP stores within the muscles.

These ATP stores last only a few seconds after which the breakdown of PC provides energy for another 5-8 seconds of activity.

Combined, the ATP-PC system can sustain all-out exercise for up to 10-15 seconds and it is during this time that the potential rate for power output is at its greatest.

If activity continues beyond this immediate period, the body must rely on other energy systems to produce ATP as the limited stores of both ATP and PC will be exhausted and will need time to replenish.

These stores are replenished after about two minutes rest.

If activity continues at a high intensity these stores may only partially replenish as there will not be enough energy available for creatine and Pi to reform PC and the rate of ATP breakdown through other energy systems will impede the replenishment of ATP stores in the muscle.

anna

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For low intensity activities, for example sleeping, working and jogging, and more intense however sustained activities such as marathon running, the ATP required for muscle contraction is produced primarily by the aerobic pathway.

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Sharnelle Grimshaw
Ben Cherrington
Ellie Brearey
Anna Cleave
Brandon Baker

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The food we eat, in the form of carbohydrates, fats and proteins, is used as fuel for reactions in the body that make us 'alive'. To utilize these fuels for muscle action, the body converts them to a common 'energy currency', called adenosine tri-phosphate (ATP). There are essentially two mechanisms for producing ATP, the aerobic and anaerobic pathways. 'Aerobic' means literally with oxygen, while 'anaerobic' means without oxygen.

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The ATP-PCr energy system can operate with or without oxygen but because it doesn’t rely on the presence of oxygen it said to be anaerobic.

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Overview. The cellular respiration process that converts food energy into ATP (a form of energy) is largely dependent on oxygen availability. ...

Adenosine triphosphate. ...

Coupled reactions. ...

Aerobic and anaerobic metabolism. ...

ATP–CP: the phosphagen system. ...

Anaerobic system. ...

Aerobic system. ...

References.

sharnelle grimshaw

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Maximum effort 20m sprints

2 blocks of 5 X 20m efforts starting from different body positions
Easy walk back recovery
2-3-minutes recovery between blocks
1:10+ work:rest

Maximum effort kneeling ball wrestle

2 blocks of 5 X 5s efforts starting each new effort on 60s
1:10+ work:rest
2-3-minutes recovery between blocks

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approximate percentages of how ATP-PCr contributes to each sport

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approximate percentages of how ATP-PCr contributes to each sport

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Sport | ATP-PC
Basketball | 60
Field events (shotput, discuss, javelin) | 90
Golf swing | 95
Gymnastics | 80
Hockey | 50
Rowing | 20
Running (distance) | 10
Skiing | 33
Soccer | 50
Swimming (50m freestyle) | 40
Tennis | 70

# data[].attributes.body
The ATP-PCr energy system can operate with or without oxygen but because it doesn’t rely on the presence of oxygen it said to be anaerobic.

# data[].attributes.body
Skeletal muscle is powered by one and only one molecule- adenosine triphosphate (ATP) . The body stores only a small amount of this ‘energy currency’ within the cells which is enough to power just a few seconds of all out exercise – this means the body must ‘create’ ATP on an ongoing basis.