Unit 3 - Energy Systems

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Please Note - Clarification of Terminology

Lactic acid is NOT a energy system and therefore lactic acid SHOULD NOT be used by students as a type of energy system.  The correct terms for the three energy systems, as identified in the study design, are the:

  • 'ATP-PC' system,
  • 'Anaerobic Glycolysis' and the
  • 'Aerobic' energy system.

For assessment purposes lactic acid is NOT acceptable terminology to identify the 'Anaerobic Glycolysis' energy system.


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Useful resources to help with revision and note taking.


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Can you annotate the following videos to teach others about the human Body's Energy Systems and how they work?   Useful to aid with AoS understanding. 


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Useful summary of Key Knowledge content needed for assessment.


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Summary of information needed to know about the body's Energy Systems


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Useful videos highlighting how Energy System interplay works with specific sporting events.  Click below 

** Remember what the 2 detemrinants are that will effect the contribution of each Energy System


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Click on the links below to complete the following revision materials.  

NB:  answers are on bottom of document. 


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Lactic Acid.  Is it so bad?  Find out some old myths and discover some new realities about this so called 'bad guy' for exercise.

Discover all by clicking the Overview link below. 


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Useful lecture videos to help with revision and note taking.  Click on the links below.


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Use the following PowerPoint links to aid with revision and note taking 


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Complete these worksheets to consolidate your revision and understanding of content. 


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Practical Activity

Wear a heart rate monitor and participate in practical activities of differing intensities and durations.  Analyse data collected and relate the findings to the dominance of each of the 3 Energy Systems.