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Exercise and Sport Physiology
Rebecca Keens

Energy

Concept Definition Measure/Units
Energy The capacity of the body to perform work/put mass into motion. Joules (J)
Work The ability to apply force over s distance. Work = Force (N) x Joules (J) or Newtons (N)
Distance (m).
Power Work performed per unit…

Page 2

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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…

Page 3

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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…

Page 4

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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…

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