Exercise Physiology

Revision notes on exercise physiology for A2 Physical Education.

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  • Created on: 10-01-08 13:01
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Exercise Physiology
Energy ­ Energy is the ability to perform work
Work ­ Force X Distance
Power ­ Speed X Strength
Chemical energy Using food to create energy
Kinetic Energy ­ Movement energy
Potential energy ­ Stored energy, Glycogen
Chemical Reaction
A chemical reaction is when atoms, molecules or compounds interact to form or
break chemical bonds
When a group of elements combine to form a compound, this is knows as a
synthesis reaction and required energy (Endothermic reaction)
In any chemical reaction, if the potential energy in the chemical bonds of the
reactants is greater than that of the product, then energy is released by the reaction.
(Exothermic reaction)
Sum of all decomposition reaction
The sum of all chemical reactions that take place within the body
Sum of all synthesis reactions
An enzyme is a catalyst that speeds up chemical reactions without being consumed
or changed
Each enzyme controls a specific reaction and are often made by adding the
Suffix (Ending) ASE to the name of the molecule
Examples of enzymes used within the energy sytem

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Alactic ATP/PC energy system
Creatine Kinase breaks down Creating Phosphate to create ATP
Lactic Acid Energy System
Glycogen phosphorylase breaks down phosphofructokinase. Lactate
Aerobic Energy System
Glycogen phosphorylase, phosphofructokinase, lipoprotein lipase
During exercise, enzyme activity within the cell speeds up tremendously
All sources of energy found in the food we eat, MUST be converted into ATP before
the potential energy in them can be used in the body.…read more


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