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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?
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