Download Recovery

Energy systems
Learning outcomes:
 All are able to demonstrate understanding of the
relationship between OBLA and VO2max
 Most are able to apply the recovery process to sport
 Some can analyse the causes of fatigue
Starter Activity
 During a marathon a performer uses the Aerobic
system predominately. Explain how this system is
used to resynthesis 38 ATP. (7 marks)
Answer
1. Majority produced by the aerobic system/oxygen
2. Glycolysis/Anaerobic glycolysis
3. Carbohydrates/glycogen/glucose
4. broken down into pyruvate/ pyruvic acid
5. Some ATP produced/2 ATP
6. Krebs cycle
7. Fats/triglycerides/fatty acids/glycerol
8. Beta oxidation
9. Oxidation of acetyl-coenzyme-A/Citric acid/ production
of CO2
10. Electron transport chain
11. Water/H2O formed/hydrogen ions formed (H+)/
hydrogen/protons
12. Large quantities of ATP produced or resynthesised/34- 36 ATP
Homework
 Revise for Mock on muscles and energy systems
 Complete exam questions on Recovery process (WS1
and Practice makes perfect)
 Complete the Energy continuum worksheets (The
energy continuum and WS4)
Use of fat in the Aerobic System
 b) (i) Very little fat is stored in muscle fibres, yet it
remains a valuable source of energy during aerobic
exercise. Explain how the fat stores of the body
become available to working muscles. (3 marks)
 (ii) What are the disadvantages of using fat as an
energy source during exercise?(3 marks)
 LOOK AT DIAGRAM ON P8 IN TEXTBOOK
Answer
(b) (i) 1. Fat stores in adipose tissue/under the skin;
2. Converted to free fatty acids/glycerol in blood;
3. Lipolysis/lipases;
4. Oxidation in muscles (Beta oxidation)
5. Mitochondria/Krebs cycle;
6. (Limited) Triglyceride stores in muscle. 3 marks
(ii) 1. Cannot be used anaerobically/sprint-type activities;
2. Less efficient in energy yield per unit of oxygen/takes more oxygen to
breakdown fat;
3. Requires carbohydrate to run;
4. Slower breakdown/transport;
5. Fat excess weight/increased energy required to perform a given task/harder to
perform given task;
6. Fat reserves act as insulating layer preventing heat loss/leads to heat stroke.
3 marks
Hitting the wall.
 You have probably heard this expression what does it
mean?
 Glycogen is depleted
 Body tries to use fatty acids as its only source
 Muscle spasms may occur.
Causes of fatigue
 Using a spider diagram use the knowledge you have gained
over the last few weeks to explain some causes of fatigue.
 Glycogen depletion
 Lactic acid build up
 Reduced rate of ATP synthesis
 Dehydration
 Reduced level of calcium
 Reduced levels of acetylecholine
Causes of Fatigue
 Glycogen depletion – When glycogen stores are depleted athletes are
said to ‘hit the wall’ as the body tries to metabolise fat.
 Lactic acid build up – Accumulation of Lactic acid releases hydrogen
ions. Increases acidity of blood plasma. Inhibits enzyme action.
 Reduced rate of ATP synthesis – ATP & PC stores are insufficient.
 Dehydration – Effect blood flow to working muscles, Blood viscosity
increases and blood pressure decreases
 Reduced level of calcium – Increase of hydrogen ions decreases the
amount of calcium released.
 Reduced levels of acetylcholine – inhibits nervous impulses
The Recovery Process
 Using your notes prepared for homework write 5
questions that you could give to somebody to
demonstrate their knowledge of the recovery process.
 Give to a partner and get them to answer them.
 Pass back and use a green pen to mark it.
The Recovery Process
In pairs using your homework notes answer these
questions:
 1. What is meant by the term recovery?
 2. Explain the term excess post-exercise oxygen
consumption (EPOC).
 3. What is the oxygen deficit?
 4. What are the two stages of recovery?
 5. Draw a diagram that illustrates the oxygen
consumption during and following exercise.
The Recovery Process
 1. the return of the body to its pre-exercise state.
 2. the extra volume of oxygen consumed during
recovery that enables the body to fully recover
 3. When we start exercising insufficient oxygen is
distributed to the tissues so the two anaerobic systems
are used. The amount of oxygen that the subject was
short of is known as the oxygen deficit. This is
compensated by the surplus oxygen.
The Recovery process
 4. The fast replenishment stage (alactacid) –
Restoration of ATP and Phosphocreatine stores.
Resaturate myoglobin. Takes 2 – 3 mins
 The slow replenishment stage (lactacid) – The
removal of lactic acid (about 1hr). O2 also used to
maintain cardiac and respiratory rates and normalise
body temp. Replenish muscle glycogen stores.
The
Recovery
process
 5.
Recovery process
 Use handout to ensure you fully understand this
process. Add any additional notes required to this.
Beat the teacher
 Read the additional reading in pack and using your
text book complete the beat the teacher activity sheet
on Carbo loading and hypoglycaemia
Plenary
 Using the following terms explain the recovery
process:
 EPOC
 Oxygen deficit
Alactacid
Recovery
Lactacid