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# Chapter 15: Oxygen Debt

Aerobic and Anaerobic Fitness
by

## Mr MacDonald (PE)

on 27 April 2016

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#### Transcript of Chapter 15: Oxygen Debt

What is Oxygen Debt?
Oxygen debt is defined as: The amount of oxygen consumed during
recovery
above that which would have ordinarily been consumed in the same time at rest (this results in a shortfall in the oxygen available).
Experiment:
Close your eyes and count how many times you breathe in a minute. (Count the number of time your chest rises).
"Where the
demand
for oxygen is greater than the
supply
."
Or put more simply...
Q:How many times do we breathe in a minute?
Write down your score..
Average (Resting) Breathing rate for a 14 year old is:13-20 breaths per minute
Experiment
Stand behind your chair make sure you have space..
Run as hard as you can on the spot for 20 seconds whilst holding your breath.
Count how many breathes you take in a minute
Record you results and re - count
Q:
W
hy does the body need
l
ots of oxygen to recover after strenuous exercise? (2 marks)
Q:
Was that
aerobic
or
anaerobic
exercise? Write in your books why. (1 mark)

Aerobic: 'With oxygen' if exercise is not too fast and is steady, the heart can supply all the oxygen muscles need.
A:
Anaerobic: 'Without oxygen'. If exercise is done in short, fast bursts, the heart cannot supply blood and oxygen to muscles as fast as the cells use them.
Working with the person next to you develop a model answer for the following Qs:

Bronze: During a match a player is likely to build up an oxygen debt. What is an oxygen debt? (1)

Silver: (ii)If a player has built up an oxygen debt will she have been working more aerobically or more anaerobically? (1)

Gold: (iii)What by-product is associated with an oxygen debt? (1)

Gold: (iv)State TWO ways in which the performer could help remove this bi-product. (2).

(Total 5 marks)
(i) A lack of oxygen 1
(ii) Anaerobically 1
(iii) Lactic acid 1
(iv) Reduce workload/equiv; breathe more deeply/rapidly 1
Cool down 1
Or put even more simply ...
"A lack of Oxygen"
Breathing rate and heart rate are elevated (to remove CO2) and this needs more oxygen.

A:
C02 and Lactic acid
.
A:
To remove waste products.
Q
: What waste products?
Q:
What would happen to the
recovery rate
if we did
aerobic
exercise at
low intensity
?
(2 marks)
A
: It would take
less time
for the body to recover because the activity has a
constant supply of oxygen
and
c02
is constantly being
exhaled
.
Q:
What happened to your breathing rate immediately after exercise, and during the
recovery period?
A:
Hopefully your breathing rate would have begun to return to a normal resting rate.
Q:
How can we help our body recover faster?
Increase breathing rate
Take deep breaths
Cool down
Reduce workload
You have 2 mins to
simplify
this definition and partner check.
Lesson Objectives:

Bronze: To be able to
explain
what Oxygen debt is.

Silver: As above. Be able to understand the
differences
between
anaerobic
and
aerobic
respiration and how they both affect Oxygen Debt
differently.

Gold: As above. Be able to
identify reasons
why oxygen debt occurs and identify
key factors
of how to
reduce
recovery time.
Recovery Period
Mark your work
Full transcript