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Exercise and Sport Physiology
Rebecca Keens
Intensity High (maximal)
This system will keep going until PC levels drop, at this point you will then move over the threshold into the next
system- Lactic Acid System.
Phosphocreatrine (PC)- An energy-rich compound found in muscle cells that is used to recycle ATP during
activities of very high intensity and short duration.
Advantages Disadvantages
There is no need for oxygen- anaerobic. Only enough PC stores for 10 seconds- there is a
No fatiguing by-products.…read more

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Exercise and Sport Physiology
Rebecca Keens
Glycolysis- The breakdown of sugar.
Lactic Acid- The by-product of anaerobic exercise produced by anaerobic glycolysis.
Advantages Disadvantages
There are large glycogen stores in the muscle/liver This system is not as quick as the ATP/PC system.
which is readily available as a potential energy Produces lactic acid, which is a fatiguing
source. by-product.
This system re-synthesises 2 ATP, which is more Reduces the pH (increased acidity) which inhibits
that the alactic system. enzyme action.…read more

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Exercise and Sport Physiology
Rebecca Keens
Advantages Disadvantages
There are large potential glycogen and free fatty Slower rate of ATP re-synthesis compared with the
acid (FFA) stores available as an efficient energy LA system due to:
store. Requires more O supply (15% more for FFAs).
Efficient ATP re-synthesis when good O supply More complex series of reactions.
guarantees breakdown of FFAs.…read more

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