Energy systems introduction AS Physical Education 2013

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Energy systems introduction AS Physical Education 2013

  1. 1. Learning Outcomes are: 1. State the only useable energy source in the body and the duration of exercise possible using the bodies stores of ATP 2. Name 2 anaerobic energy systems and 1 aerobic energy systems 3. Describe 3 energy systems using the key terms intensity and duration
  2. 2. Energy is the ability or capacity to do work and is measured in calories or joules.
  3. 3. ……………is the only immediately usable energy source for all bodily functions and activities (movements). Small amounts stored within muscle cell – total in body – 85g Enough for 2-3 seconds of exercise e.g. ??????? ATP ADP + P + ATPase Energy
  4. 4. With only 2-3 seconds of ATP in the body – we need to re-synthesise some! The body has three processes for doing this – 3 ‘energy systems’ The intensity and duration of the task being performed dictates which of these systems is used Energy Systems
  5. 5. Stage 1 Stage 2 ATP-PC System
  6. 6. C.H.O. Glucose 2 ATP Pyruvic Acid No O2 Lactic Acid Lactic Acid System
  7. 7. C.H.O. Stage 1 Glucose 2 ATP Aerobic System Pyruvic Acid 2 ATP Kreb’s Cycle Stage 2 Hydrogen Electron Transfer chain Stage 3 34 ATP H2O 2CO2
  8. 8. Aerobic System C6H1206 + 6O2 = 6CO2 +6H2O + ENERGY
  9. 9. 2. During a 1500m race all three energy systems are used to replenish ATP. Using the 1500m as your example ,explain when each of the energy systems would be predominant? (4) 1. The continued replenishment of Adenosine Tri-Phosphate (A.T.P) is essential in maintaining sporting performance. Use a chosen sporting activity to explain when each energy system would be used to replenish A.T.P. [3]
  10. 10. Question 1 – Mark Scheme (Separate specific sporting activity for each is acceptable.) a. ATP-CP used during very high intensity (95-100%) b. Anaerobic glycolysis/lactic acid system high intensity with longer duration, up to 90 secs c. Aerobic Low to moderate intensity high duration d. Intensity of aerobic exercise and individual fitness level of will determine the use of fats or carbs e. Interchangeable and overlap of the energy systems through the energy continuum f. (3 x 1 only if examples are specific from sport/activity)
  11. 11. Question 2 – Mark Scheme The relative contribution of each energy system to ATP re-synthesis it is determined by the intensity and duration of exercise. ● Start - ATP - PC High intensity sprint off line to gain position ● Limited supply/short duration of ATP-PC (approx 10 secs) means also use anaerobic glycolysis for the first 100-150m ● Limited supply of muscle glycogen/build up of lactic acid means intensity has to drop ● Pace settles using aerobic system at a lower intensity/high duration ● Working under anaerobic threshold (6080%) ● As pace builds towards end of race as intensity increases more anaerobic energy will be used ● Final sprint more ATP-PC Must be related to the actual race in terms of intensity and duration.
  12. 12. o On each table there is one hula hoop oTime each member of the group to see how long they can hula for (max 3 attempts if necessary) – record results oNext to the best time for each member of the group state which energy system is being used oWho has the longest time? Hula Hoop Challenge
  13. 13. Learning Outcomes are: 1. State the only useable energy source in the body and the duration of exercise possible using the bodies stores of ATP 2. Name 2 anaerobic energy systems and 1 aerobic energy systems 3. Describe 3 energy systems using the key terms intensity and duration

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