1. ENERGY SYSTEMS LESSON 3 Lactic Acid Energy System Lactic Acid Energy System

2. LEARNING OBJECTIVES 1. Am I able to explain the Lactic Acid System? 2. Can I evaluate the Lactic Acid System?

3. STARTER

4. STARTER ANSWERS 1. I understand 2. Man overboard 3. Undercover agent 4. Long underwear 5. Easy on the eyes 6. I over ate 7. Circles under his eyes 8. Going around in circles 9. High chair 10. Flat tyre 11. Downtown 12. Cross roads 13. Sick in bed 14. Mixed up kid 15. Running around the block 16. Scrambled eggs

5. LACTIC ACID ENERGY SYSTEM Explain what is happening below: Glycogen GPH GPHGlucose GPH = Glycogen Phosphorylase (converts stored Glycogen into active Glucose in the blood)

6. LACTIC ACID ENERGY SYSTEM Explain what is happening below: Glucose PFK PFK2ATP Pyruvic Acid PFK = Phosphofructokinase (helps to break Glucose into Pyruvic Acid)

7. LACTIC ACID ENERGY SYSTEM Explain what is happening below: LDH Lactic AcidPyruvic Acid LDH = Lactate Dehydrogenase (converts Pyruvic Acid into Lactic Acid)

8. LACTIC ACID ENERGY SYSTEM Explain what is happening below: Glycogen GPH GPHGlucose PFK PFK LDH2ATP Lactic AcidPyruvic Acid

9. ENZYMES OF THE LACTIC ACID ENERGY SYSTEM GPH = Glycogen Phosphorylase (converts stored Glycogen into active Glucose in the blood) GPH = Glycogen Phosphorylase (converts stored Glycogen into active Glucose in the blood) PFK = Phosphofructokinase (helps to break Glucose into Pyruvic Acid) PFK = Phosphofructokinase (helps to break Glucose into Pyruvic Acid) LDH = Lactate Dehydrogenase (converts Pyruvic Acid into Lactic Acid) LDH = Lactate Dehydrogenase (converts Pyruvic Acid into Lactic Acid)

10. TASK Explain how ATP is re-synthesised in the Lactic Acid System Explain how ATP is re-synthesised in the Lactic Acid System You must include information on the following: You must include information on the following: Use of enzymes Use of enzymes End products from chemical reactions End products from chemical reactions

11. TRAINING ADAPTATIONS Repeated bouts of anaerobic training which overload the LA system also increase the body’s tolerance to lactic acid This will increase the body’s stores of Glycogen This also delays the effect of OBLA (Onset of Blood Lactate Accumulation) and prolongs the Lactic Acid threshold

12. ADVANTAGES OF THE LACTIC ACID ENERGY SYSTEM Relatively large amount of Glycogen stored in muscles/liver and is readily available Re-synthesises two molecules of ATP – more than ATP/PC System Requires few chemical reactions than Aerobic System, so provides a quicker supply of energy GPH and PFK enzyme activation due to a decrease in PC Can work aerobically and anaerobically Provides energy for high intensity exercise lasting between 10 and 180 seconds

13. DISADVANTAGES OF THE LACTIC ACID ENERGY SYSTEM Not as quick as the ATP/PC System Produces Lactic Acid, which is a fatiguing by-product Reduces pH of muscle cell (making it more acidic) which inhibits the enzyme action Stimulates pain receptors Net effect is muscle fatigue and pain

14. FACTS OF THE LACTIC ACID SYSTEM There is NO Oxygen present!! Therefore, the Lactic Acid System works under Anaerobic conditions The fuel for this system is Carbohydrates (in the form of Glycogen) The reactions take place in the sarcoplasm of the muscle cells The main limitation of this system is the Onset of Blood Lactate Accumulation (OBLA) – which lowers the pH and inhibits enzymes The Lactic Acid system is the predominant energy system for the 400m sprint and for midfield games players that have lots of high intensity sprints with no time for recovery

15. PLENARY Discuss how you think ATP can be re- synthesised during exercise lasting longer than 30 seconds Discuss how you think ATP can be re- synthesised during exercise lasting longer than 30 seconds