Oxygen debt is the older name for the extra oxygen taken in during recovery to repay the deficit. The modern term is EPOC.

EPOC is excess post-exercise oxygen consumption. EPOC is the oxygen consumed after exercise, above resting levels, to return the body to its pre-exercise state.

Why is EPOC larger than the oxygen deficit that caused it?

Extra oxygen is needed because heart rate, breathing and body temperature stay raised after exercise. Lactate removal adds further to the demand.

Why is EPOC much larger after a 400 m race than after a steady jog?

A 400 m race creates a large oxygen deficit, uses much phosphocreatine and produces a lot of lactate. More oxygen is needed to restore all of this.

Eduqas A-Level Physical Education A550QS

Health, Fitness and an Active Lifestyle

Topic overview Health, fitness and the UK activity guidelines Physical, psychological and social benefits of exercise Sedentary lifestyles and the risks to health

Short-Term Responses to Exercise

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Fatigue and Recovery

Topic overview Fuel depletion, dehydration and fatigue Lactate accumulation, OBLA and DOMS Oxygen deficit and the stages of EPOC Lactate removal and recovery aids

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Fatigue and Recovery

Oxygen deficit and the stages of EPOC

3 things to know
Components 1 and 2

Overview

Oxygen deficit and oxygen debt, EPOC and why it exceeds the deficit, the 400 m and the jog, the alactic stage and phosphocreatine restoration, the tennis player's 25 seconds, myoglobin re-saturation and the lactacid stage.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Process

Why is EPOC larger after a 400 m race than a jog, and what happens in the alactic stage?

Key term

What is oxygen deficit?

Key term

Why does an oxygen deficit occur even at the start of a gentle jog?

Questions from this subtopic

Each one with the model answer underneath.

1
What is oxygen deficit?
Model answer
Oxygen deficit is the shortfall between the oxygen needed and the oxygen supplied at the start of exercise. The gap is met by anaerobic energy.
2
Why does an oxygen deficit occur even at the start of a gentle jog?
Model answer
Heart rate, breathing and blood flow take time to rise. The aerobic system cannot meet the new demand straight away.
3
What is oxygen debt?
Model answer
Oxygen debt is the older name for the extra oxygen taken in during recovery to repay the deficit. The modern term is EPOC.
4
What is EPOC?
Model answer
EPOC is excess post-exercise oxygen consumption. EPOC is the oxygen consumed after exercise, above resting levels, to return the body to its pre-exercise state.
5
Why is EPOC larger than the oxygen deficit that caused it?
Model answer
Extra oxygen is needed because heart rate, breathing and body temperature stay raised after exercise. Lactate removal adds further to the demand.
6
Why is EPOC much larger after a 400 m race than after a steady jog?
Model answer
A 400 m race creates a large oxygen deficit, uses much phosphocreatine and produces a lot of lactate. More oxygen is needed to restore all of this.

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Health, Fitness and an Active Lifestyle

Short-Term Responses to Exercise

Long-Term Adaptations to Exercise

Fitness Testing and Components of Fitness

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Oxygen deficit and the stages of EPOC

Overview

What you need to know

Why is EPOC larger after a 400 m race than a jog, and what happens in the alactic stage?

What is oxygen deficit?

Why does an oxygen deficit occur even at the start of a gentle jog?

Questions from this subtopic

What is oxygen deficit?

Why does an oxygen deficit occur even at the start of a gentle jog?

What is oxygen debt?

What is EPOC?

Why is EPOC larger than the oxygen deficit that caused it?

Why is EPOC much larger after a 400 m race than after a steady jog?

Other ways to work this

What is inside Levo

See a huge jump in your memorisation

Cram a whole paper in one sitting

Blank Blitz consolidates the facts

Build It trains answer structure

Test It catches misconceptions

Brain Breaks between sessions

Every question in Fatigue and Recovery, on a schedule.