There are three energy systems - ATP-PC, anaerobic glycolysis, and aerobic - that produce ATP to power muscle contractions. The ATP-PC and anaerobic glycolysis systems produce ATP quickly but in small amounts and can only be used for short durations before causing fatigue. The aerobic system produces large amounts of ATP over long durations without causing fatigue but takes longer to produce ATP. The predominant energy system used depends on the activity duration, intensity, fitness level, and recovery time between efforts.

1. Energy Systems

2. The breakdown of ATP
releases energy for muscular
contractions to occur.
ATP is stored within the
muscle in a limited quantity
and is responsible for
movement.
ATP is continually being used
and resynthesised enabling the
body to keep moving.

3. There are three energy systems responsible for manufacturing
ATP and there are two essential ways for ATP to be produced:
The Aerobic Pathway- Aerobic literally means with oxygen
The Anaerobic Pathways- Anaerobic literally means without
oxygen
There are two types of anaerobic systems:
The ATP-PC System
The anaerobic glycolysis system

4. ANAEROBIC PATHWAYS
• Produce ATP quickly &
powerfully
• Produce small amounts
ATP
• Operate for short duration
• Result in by-products
associated with muscle
fatigue
AEROBIC PATHWAY
• Used at 60-85% Max HR
• Body can meet the demand
for O2
• Produces large amounts
ATP for long duration
• Cannot be produced quickly
or for high intensity
• Has no by-products
associated with fatigue

6. The The energy system used will depend on
the following:
– Activity duration
– Activity intensity
– Level of aerobic fitness
– Recovery between
efforts

7. Powerful, explosive efforts
Uses chemical fuel- Creatine phosphate
Lasts for 10 Seconds
95-100%Max HR

8. High intensity (85-95% max
HR) repeated efforts
(insufficient recovery) 10-
30 secs up to 60 secs
Breaks down glycogen
stores anaerobically
Accumulation of by-
products associated with
muscle fatigue

9. Used at rest and sub-max (<85% max HR)
Dominant supplier energy after 30 secs
No fatiguing by-products
Assist the anaerobic systems during recovery
Uses glycogen, triglycerides and proteins (last resort)
Slow supplier energy because requires O2

11. Interplay describes the
three energy systems
working together to
provide ATP resynthesis
The energy system
contributing the most
ATP resynthesis is
referred to as the
predominant energy
system

14. Type 1 Type 2A Type 2B
• Slow twitch
• Red
• Rich blood
supply
• Fatigue resistant
• Low force
• Use
Aerobic
pathways
• Larger fibres
• Poor blood supply
• High force
• Fatigue quickly
• Red
• Fast contraction
speed
• Repeat efforts
• Use both Aerobic
& Anaerobic
pathways
• Largest fibres
• Poor blood supply
• High force
• Fatigue quickly
• White
• Fast
contraction
speed
• Large force
Use
Anaerobic
pathways