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Food fuels and the three energy systemsText Reference1.    Nelson Physical      Education VCE Units      3&4 – Chapter 5.
Key Knowledge   Characteristics and interplay of the three energy systems (ATP – CP, anaerobic    glycolysis, aerobic sys...
Food fuels and the three energy systems
1.   Carbohydrates (CHO) –     Preferred source of fuel     during exercise (Glycogen)2.   Fat – Concentrated fuel     use...
VCE Physical Education - Unit 3
VCE Physical Education - Unit 3
   Complete questions 1-4 page 117 of Nelson    Physical Education VCE Units 3 & 4.
Food fuels and the three energy systems
VCE Physical Education - Unit 3
Food fuels and the three energy systems
Everything we eat is broken downand either used immediately,excreted or stored as chemicalenergy
Rest (Aerobic)     Fat and glucose are the preferred fuelsDuring Exercise1.    Short duration / high intensity – Anaerobi...
Food fuels and the three energy systems
Low intensity ATP requirements are met aerobically using the aerobic system.High Intensity Explosive movements require i...
Storage (Based on 80kg person)         Carbohydrate rich diet; Muscle glycogen – 400g                Increases glycogen ...
Storage of fats                       At rest Adipose tissue                                       50% of energy supplie...
Role of protein (Amino acids) in the body;    Growth and repair    Speed up reactions in the body (Enzymes)    Produces...
During prolonged endurance events  such as marathon running and  triathlons; Body uses a combination of CHO and  fats. T...
Glycemic index;                                 Before exercise you should Rating of CHO effect on                       ...
Food fuels and the three energy systems
   Aerobic exercise includes lower intensity activities performed for    longer periods of time.   Activities like walki...
   The term "anaerobic" means "without air" or "without oxygen."   Anaerobic exercise uses muscles at high intensity and...
   The three energy systems do    not turn on and off like a    traffic light.   They are always in operation    – the r...
Food fuels and the three energy systems
How does the system work? Anaerobic                   PC releases a free Most rapidly available       phosphate        ...
VCE Physical Education - Unit 3
Food fuels and the three energy systems
The lactic acid system;               How the system works; Activated at the start of intense    Glycogen is broken down...
The exercise intensity   beyond which lactateproduction exceeds removal.
VCE Physical Education - Unit 3
Food fuels and the three energy systems
The aerobic system                     How the system works; Slowest contributor to ATP                                  ...
VCE Physical Education - Unit 3
Foods, Fuels and Energy Systems
VCE Physical Education - Unit 3
Foods, Fuels and Energy Systems
All activities use some energy from all three systems.The energy systems overlap – they never work independently.It it’s t...
   Complete questions 1-6 page 138-139 of    Nelson Physical Education VCE Units 3 & 4.
Food fuels and the three energy systems
Food fuels and the three energy systems
Food fuels and the three energy systems
Food fuels and the three energy systems
Food fuels and the three energy systems
Food fuels and the three energy systems
Food fuels and the three energy systems
Food fuels and the three energy systems
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Transcript of "Food fuels and the three energy systems"

  1. 1. Food fuels and the three energy systemsText Reference1. Nelson Physical Education VCE Units 3&4 – Chapter 5.
  2. 2. Key Knowledge Characteristics and interplay of the three energy systems (ATP – CP, anaerobic glycolysis, aerobic system) for physical activity, including rate of ATP production, the capacity of each energy system and the contribution of each energy system. Fuels (both chemical and food) required for resynthesis of ATP during physical activity and the utilisation of food for energy. Relative contribution of the energy systems and fuels used to produce ATP in relation to the exercise intensity, duration and typeKey Skills Describe, using correct terminology, the interplay and relative contribution of the energy systems in different sporting Perform, observe, analyse and report on laboratory exercises designed to explore the relationship between the energy systems during physical activity Explain the role the energy systems play in enabling activities to occur as well as their contribution to active and passive recovery
  3. 3. Food fuels and the three energy systems
  4. 4. 1. Carbohydrates (CHO) – Preferred source of fuel during exercise (Glycogen)2. Fat – Concentrated fuel used during rest and Energy prolonged sub-maximal exercise.3. Protein – Used for growth and repair (Negligible use during exercise)
  5. 5. VCE Physical Education - Unit 3
  6. 6. VCE Physical Education - Unit 3
  7. 7.  Complete questions 1-4 page 117 of Nelson Physical Education VCE Units 3 & 4.
  8. 8. Food fuels and the three energy systems
  9. 9. VCE Physical Education - Unit 3
  10. 10. Food fuels and the three energy systems
  11. 11. Everything we eat is broken downand either used immediately,excreted or stored as chemicalenergy
  12. 12. Rest (Aerobic) Fat and glucose are the preferred fuelsDuring Exercise1. Short duration / high intensity – Anaerobic systems used using carbohydrates.2. Long duration / low intensity – Aerobic system using carbohydrates. However, fats are used once glycogen stores are depleted.
  13. 13. Food fuels and the three energy systems
  14. 14. Low intensity ATP requirements are met aerobically using the aerobic system.High Intensity Explosive movements require instant supply of ATP which can’t be met aerobically, therefore the ATP-PC and lactic acid systems need to be used anaerobically. Aerobic Anaerobic Intensity increases
  15. 15. Storage (Based on 80kg person) Carbohydrate rich diet; Muscle glycogen – 400g  Increases glycogen stores Liver glycogen – 100g  Glycogen is used in rebuildingIntake of Carbohydrates depends on ATP the intensity and duration of CHO preferred fuel over fats during exercise bouts. exercise due to requiring less Normal contribution to diet is 55- oxygen to release energy. 60% CHO Athletes need to be aware of their Carbohydrate loading (80% CHO dietary intakes of CHO. Excess intake) is used for endurance CHO is converted to fat. activities.
  16. 16. Storage of fats At rest Adipose tissue  50% of energy supplied by fats Triglycerides  Oxygen demand is easily met to(Broken down into free fatty acids)Aerobic metabolism of fat is; burn fats Slow as it requires more oxygen Benefits of fat than CHOs.  Large energy store Adds stress to the oxygen  Transport medium for fat soluble transport system vitamins ATP yield is much higher from fat Negative aspects of fat (460 molecules) in comparison to  Adverse health effects glucose (36).  Obesity, heart disease etc.
  17. 17. Role of protein (Amino acids) in the body; Growth and repair Speed up reactions in the body (Enzymes) Produces hormones and antibodiesProtein and exercise1. Not used as a fuel, therefore low priority.2. Only used in extreme circumstances3. Normal diet contains enough protein (15%).Excess protein can lead to; Less intake of CHO Increase in fat intake from animal products Increase in fluid waste
  18. 18. During prolonged endurance events such as marathon running and triathlons; Body uses a combination of CHO and fats. Trained athletes are able to ‘spare’ glycogen and use free fatty acids. Fats cannot be used alone as a fuel (poor solubility in the blood). ‘Hitting the wall’ occurs when glycogen stores are depleted. This is called ‘hypoglycaemia’. VCE Physical Education - Unit 3
  19. 19. Glycemic index; Before exercise you should Rating of CHO effect on eat; blood glucose  Food that maintains blood Quick breakdown with glucose levels ie.low GI food immediate effect on blood  Avoid high GI food prior to glucose levels are labelled exercise. high GI  High GI cause an insulin Slow breakdown are surge, effecting the labelled low GI performance of an athlete VCE Physical Education - Unit 3
  20. 20. Food fuels and the three energy systems
  21. 21.  Aerobic exercise includes lower intensity activities performed for longer periods of time. Activities like walking, jogging, swimming, and cycling require a great deal of oxygen to make the energy needed for prolonged exercise. The energy system that is used in aerobic exercise is called the aerobic system. It can also be called ‘oxygen system’ or the ‘aerobic glycolysis system’.
  22. 22.  The term "anaerobic" means "without air" or "without oxygen." Anaerobic exercise uses muscles at high intensity and a high rate of work for a short period of time. Anaerobic exercise helps us increase our muscle strength and stay ready for quick bursts of speed. Examples of anaerobic exercise include heavy weight lifting, sprinting, or any rapid burst of hard exercise. These anaerobic exercises cannot last long because oxygen is not used for energy and fatiging metabolic by-products There are two energy systems which use the anaerobic pathways; ATP-PC and the Lactic Acid systems
  23. 23.  The three energy systems do not turn on and off like a traffic light. They are always in operation – the relative contribution of each system varies depending on factors such as intensity, type of activity and duration.
  24. 24. Food fuels and the three energy systems
  25. 25. How does the system work? Anaerobic  PC releases a free Most rapidly available phosphate PC = P + C source of ATP ADP + P = ATP Depends on simple short chemical reactions  Body has a larger storage of PC compared to ATP Stored PC last for 10  PC stores can be seconds at max replenished through aerobic recovery. intensity  Once PC stores are depleted, they body must use glycogen through the anaerobic pathway.
  26. 26. VCE Physical Education - Unit 3
  27. 27. Food fuels and the three energy systems
  28. 28. The lactic acid system; How the system works; Activated at the start of intense  Glycogen is broken down in the exercise absence of oxygen (Anaerobic More complex reactions than the glycolysis)  This produces a fatigue causing ATP-PC system by product called lactic acid. Peak power until it fatigues (2-3  Lactic acid makes the muscle pH minutes) decrease (More acidic), reducing Predominant energy supplier in ATP resynthesis. events 85% max HR eg. 200m The lactic acid system; sprint.  Provides twice as much energy for ATP resynthesis than the ATP- PC system.  Fatiguing metabolic by-products produced at the lactate inflection point (LIP)
  29. 29. The exercise intensity beyond which lactateproduction exceeds removal.
  30. 30. VCE Physical Education - Unit 3
  31. 31. Food fuels and the three energy systems
  32. 32. The aerobic system How the system works; Slowest contributor to ATP 1. CHOs and Tryglycerides (FFA + resynthesis glycerol) broken down to release However, produces much more energy than the anaerobic systems energy. This produces pyruvic acid. Becomes major contributor once the 2. Pyruvic acid is further broken down lactic system decreases. producing carbon dioxide (Kreb’s Major contributor in prolonged cycle) exercise eg. Endurance events. 3. Further breakdown via the electron Aerobic system does contribute in transport chain. It requires hydrogen maximal intensity exercise (Eg. ions and oxygen, producing water Between 55-65% in 800m) and heat.table 4.4 p.101 and 4.5 p.102
  33. 33. VCE Physical Education - Unit 3
  34. 34. Foods, Fuels and Energy Systems
  35. 35. VCE Physical Education - Unit 3
  36. 36. Foods, Fuels and Energy Systems
  37. 37. All activities use some energy from all three systems.The energy systems overlap – they never work independently.It it’s the relative contribution of each system that varies.
  38. 38.  Complete questions 1-6 page 138-139 of Nelson Physical Education VCE Units 3 & 4.
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