1. N. Walker GCSE PE Edexcel
Word Challenge
N. Walker GCSE PE Edexcel

2. 1.3 Aerobic and Anaerobic Exercise
The use of glucose and oxygen to release energy aerobically.
The impact of insufficient oxygen on energy release.
Energy sources for aerobic and anaerobic activity.
N. Walker GCSE PE Edexcel

3. N. Walker GCSE PE Edexcel
Energy
Muscles need energy to work
Energy comes from food which is converted into glucose in the body
Muscle and liver store glucose as glycogen; this is then converted back to glucose for use during exercise
To work efficiently muscles need plenty of oxygen.
The energy systems can work aerobically (with oxygen) or anaerobically (without oxygen).
N. Walker GCSE PE Edexcel

4. N. Walker GCSE PE Edexcel
Aerobic Respiration
The process of releasing energy from glucose with oxygen.
Your body’s usual intake of oxygen is enough to give the muscles what they need.
Moderate intensity exercise, long periods of time.
glucose + oxygen energy + CO2 + water
N. Walker GCSE PE Edexcel

5. Can you think of any other sporting examples?
Aerobic Respiration
Can you think of any other sporting examples?

6. Anaerobic Respiration
The process of releasing energy from glucose without oxygen.
Muscles need more energy but the body cannot deliver enough oxygen to them.
Glucose is still used but there is a waste product called lactic acid.
Intense activities like 100m.
Short sharp activities like shot putt.
glucose energy + lactic acid
N. Walker GCSE PE Edexcel

7. N. Walker GCSE PE Edexcel
Lactic Acid
Lactic acid is a toxic produced in muscles during strenuous exercise.
It makes muscles ache and causes muscle fatigue, this leads to a drop in performance levels.
Eventually it causes cramp and the muscles stop working.
Cramp is a painful involuntary contraction of the muscle usually caused by fatigue.
N. Walker GCSE PE Edexcel

8. N. Walker GCSE PE Edexcel
Oxygen Debt
The amount of oxygen needed at the end of a physical activity to break down any lactic acid.
Lactic acid can be removed by:
Breathing more deeply
Cooling down
Stopping exercise
N. Walker GCSE PE Edexcel

9. Anaerobic Respiration
Photos: © LOCOG
Activities like sprinting, weightlifting, jumping and throwing are anaerobic in nature.

10. Which respiration system do you think the following sportspeople mainly use?
Photos by: LOCOG

11. N. Walker GCSE PE Edexcel
Energy Sources
Carbohydrates are a fuel source for both anaerobic and aerobic activities. Foods such as pasta, bread, rice and bananas will release energy quicker than fats.
Fats are a fuel sources for aerobic activities ONLY. This is due to slow release of it energy to the body.
N. Walker GCSE PE Edexcel

12. Aerobic or anaerobic system? Discuss.
Photos by: LOCOG

13. Exam Questions
1. During a match a player is likely to build up an oxygen debt. (a) If a player has built up an oxygen debt will she have been working aerobically or anaerobically? (1)
(b) What by-product is associated with an oxygen debt? (1)
(c) State TWO ways in which the performer could help remove this bi-product. (2)
(d) Explain the effects that this waste product can have on the body. (2)

14. Respiration Continuum
Aerobic
Anaerobic
Place each sport on the respiration continuum based on how much of each system they require to perform in their sport.
Netball Football goalkeeper
100m 100m butterfly
Triathlon Gymnast
Rugby Diver
800m 10,000m
N. Walker GCSE PE Edexcel