Unit 1 P7
Know the
different types
of energy systems
• All movement requires energy.
• The methods by which your body generates
energy is determined by the intensity and
duration of the activity being undertaken.
• Activities that require short bursts effort like
sprinting or jumping require the body to
produce large amounts of energy over a short
period of time.
•
Marathon running or cycling require the body
to provide continued energy production over a
longer period and at a slower rate.
http://www.youtube.com/watch?v=5G
8cVpXpsL8
Phosphocreatine
energy system
ATP and Creatine phosphate make up the ATP-PC
system. It is the immediate energy system.
When exercise intensity is high, or energy needs
are instantaneous, Creatine phosphate stored in
the muscle is broken down to provide energy to
make ATP. When the high energy bond in PC is
broken, the energy it releases is used to
resynthesise ATP.
Explosive work can be achieved but only for up to
10 seconds at maximum intensity. For example
100metre runner.
Lactic acid energy system
This is the short term energy system. To
meet energy requirements of higher
intensity over a longer period, such as
during a 400 metre race, ATP can be
made by the partial breakdown of
glucose and glycogen. This is an aerobic
process that does not require oxygen
and is therefore not sustainable over a
long duration.
Aerobic energy system
This is the long term energy system. If
plenty of oxygen is available, as it is
during everyday movements and light
exercise, glycogen and fatty acids break
down to yield large amounts of ATP.
Phosphocreatine
ENERGY SYSTEMS
O2 Required
Speed of energy
supply
Fuel Source
Amount of ATP
Production
By Products
Duration
Cause of fatigue
Activity
ATP/PC SYSTEM
ANAEROBIC
GLYCOLYSIS (Lactic
acid system)
AEROBIC ENERGY
SYSTEM
No
No
Yes
Very fast
Fast
Slow
Creatine Phosphate
Carbohydrates
Carbohydrates &fats
(protein in extremes)
Limited
Limited
Unlimited
None
Lactic acid
CO2 ,H2O & Heat
0-10sec
Up to 2min
Forever
Limited supply
ATP/PC
Lactic acid production
Unlimited
Power based
activities
Sprint endurance
Long duration
Energy contribution
ATP/PC SYSTEM
•Main source of energy in
first 10 sec
•Peaks in output at approx
5sec
•Fatigues quickly due to
depletion ATP/PC
AEROBIC ENERGY SYSTEM
•Main source of energy from 30sec +
(point when oxygen supply has increased
sufficiently to contribute ATP)
•Unlimited capacity to work unless
insufficient fuel supply (food)
LACTIC ACID SYSTEM
•Main source of energy from 10- 30 sec
•Peaks in output at approx 20sec
•Fatigues due to build up of lactic acid
•Provides energy for up to 2min
10s
20s
30s
60s
Time
2min
4min+
ENERGY SYSTEM INTERPLAY