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

ENERGY ENERGY SYSTEMSSYSTEMS

LESSON 3LESSON 3Lactic Acid Energy SystemLactic Acid Energy System

LEARNING OBJECTIVESLEARNING OBJECTIVES

1.1. Am I able to explain the Lactic Acid Am I able to explain the Lactic Acid System?System?

2.2. Can I evaluate the Lactic Acid Can I evaluate the Lactic Acid System?System?

STARTERSTARTER

STARTER ANSWERSSTARTER ANSWERS

1.1. I understandI understand

2.2. Man overboardMan overboard

3.3. Undercover agentUndercover agent

4.4. Long underwearLong underwear

5.5. Easy on the eyesEasy on the eyes

6.6. I over ateI over ate

7.7. Circles under his Circles under his eyeseyes

8.8. Going around in Going around in circlescircles

9.9. High chairHigh chair

10.10. Flat tyreFlat tyre

11.11. DowntownDowntown

12.12. Cross roadsCross roads

13.13. Sick in bedSick in bed

14.14. Mixed up kidMixed up kid

15.15. Running around Running around the blockthe block

16.16. Scrambled eggsScrambled eggs

LACTIC ACID ENERGY LACTIC ACID ENERGY SYSTEMSYSTEM

Explain what is happening below:Explain what is happening below:

GlycogenGlycogen

GPHGPH

GlucoseGlucose

GPH = Glycogen Phosphorylase (converts GPH = Glycogen Phosphorylase (converts stored Glycogen into active Glucose in stored Glycogen into active Glucose in the blood)the blood)

LACTIC ACID ENERGY LACTIC ACID ENERGY SYSTEMSYSTEM

Explain what is happening below:Explain what is happening below:

GlucoseGlucose

PFKPFK

2ATP2ATP

Pyruvic AcidPyruvic Acid

PFK = Phosphofructokinase (helps to PFK = Phosphofructokinase (helps to break Glucose into Pyruvic Acid)break Glucose into Pyruvic Acid)

LACTIC ACID ENERGY LACTIC ACID ENERGY SYSTEMSYSTEM

Explain what is happening below:Explain what is happening below:

LDHLDH

Lactic AcidLactic Acid Pyruvic AcidPyruvic Acid

LDH = Lactate Dehydrogenase (converts LDH = Lactate Dehydrogenase (converts Pyruvic Acid into Lactic Acid)Pyruvic Acid into Lactic Acid)

LACTIC ACID ENERGY LACTIC ACID ENERGY SYSTEMSYSTEM

Explain what is happening below:Explain what is happening below:

GlycogenGlycogen

GPHGPH

GlucoseGlucose

PFKPFK

LDHLDH 2ATP2ATP

Lactic AcidLactic Acid Pyruvic AcidPyruvic Acid

ENZYMES OF THE ENZYMES OF THE LACTIC ACID ENERGY LACTIC ACID ENERGY

SYSTEMSYSTEM GPH = Glycogen Phosphorylase GPH = Glycogen Phosphorylase

(converts stored Glycogen into (converts stored Glycogen into active Glucose in the blood)active Glucose in the blood)

PFK = Phosphofructokinase PFK = Phosphofructokinase (helps to break Glucose into (helps to break Glucose into Pyruvic Acid)Pyruvic Acid)

LDH = Lactate Dehydrogenase LDH = Lactate Dehydrogenase (converts Pyruvic Acid into Lactic (converts Pyruvic Acid into Lactic Acid)Acid)

TASKTASK

Explain how ATP is re-synthesised in Explain how ATP is re-synthesised in the Lactic Acid Systemthe Lactic Acid System

You must include information on the You must include information on the following:following: Use of enzymesUse of enzymes End products from chemical reactionsEnd products from chemical reactions

TRAINING TRAINING ADAPTATIONSADAPTATIONS

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

ADVANTAGES OF THE ADVANTAGES OF THE LACTIC ACID ENERGY LACTIC ACID ENERGY

SYSTEMSYSTEM 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

DISADVANTAGES OF THE DISADVANTAGES OF THE LACTIC ACID ENERGY LACTIC ACID ENERGY

SYSTEMSYSTEM 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

FACTS OF THE LACTIC FACTS OF THE LACTIC ACID SYSTEMACID 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

PLENARYPLENARY

Discuss how you think ATP Discuss how you think ATP can be re-synthesised during can be re-synthesised during exercise lasting longer than exercise lasting longer than 30 seconds30 seconds