Energy systems

Energy Systems

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.

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

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

The The energy system used will depend on

the following:– Activity duration

– Activity intensity

– Level of aerobic fitness

– Recovery between efforts

Powerful, explosive efforts

Uses chemical fuel- Creatine phosphate

Lasts for 10 Seconds

95-100%Max HR

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

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

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

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