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Energy Systems

Energy Systems. 3 Systems 3 groups of energy nutrients Muscle fibre types. Three Energy Systems. ATP – PC (anaerobic alactic) – No oxygen Glycolysis (anaerobic lactic) – No oxygen Aerobic System – oxygen needed. Adenosine Triphosphate (ATP). ATP – It is re-synthesized in two ways:

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Energy Systems

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  1. Energy Systems 3 Systems 3 groups of energy nutrients Muscle fibre types

  2. Three Energy Systems • ATP – PC (anaerobic alactic) – No oxygen • Glycolysis (anaerobic lactic) – No oxygen • Aerobic System – oxygen needed

  3. Adenosine Triphosphate (ATP) • ATP – It is re-synthesized in two ways: Aerobically in the mitochondria = 36 ATP or Anaerobically in the cytoplasm = 1or 2ATP • 1 molecule of PC gives 1 molecule of ATP • 1 molecule of glucose gives 2 ATP + Lactate

  4. The Three Energy Nutrients • Carbohydrates – glucose and glycogen • Proteins – amino acids • Fats – fatty acids

  5. ATP – PC system • Anaerobic alactic – no lactic acid is produced • Lasts 10 -15 seconds • Uses stored ATP and creatine phosphate • No by-products, just the product ATP

  6. Glycolysis • Anaerobic Lactic system • Lasts 15 seconds – 3 minutes • Uses glucose and glycogen to make ATP • By – product is lactic acid

  7. Aerobic System • Occurs in cytoplasm and mitochondria • Needs oxygen to produce all 36 ATP • Lasts as long as you are alive • Uses glucose, glycogen, fats, and proteins to make ATP • By-products are carbon dioxide and water

  8. Muscle Fibre types • Type I – slow twitch (aerobic) • Type IIA – Fast twitch ( Fast twitch oxidative or FOG) • Type IIB – Fast twitch (anaerobic)

  9. Type I • Slow contractions but can go a long time • Red (dark) in colour • Predominantly used in aerobic activities • High concentration of myoglobin – muscle can store oxygen for regeneration of ATP

  10. Type II A • In between fast and slow twitch • Faster, stronger contraction than Type I but can be sustained longer than Type IIB • Redish/white in colour • Moderate myoglobin concentration • Predominantly used in anaerobic activities

  11. Type II B • Fast twitch • White in colour • Fastest contraction speed of all muscle fibres • Low myoglobin concentrations • Predominantly used in anaerobic alactic activities – explosive lift or jump

  12. Approximate Distribution of muscle fibre types

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