Transcript Creatine Phosphate System

The Energy Systems
Breakdown of
ATP into ADP
& Phosphate
Releases
energy
Re-synthesis
of ADP &
Phosphate to
form ATP
Uses energy
ATP needs to
be reproduced
as quickly as it
is used up
Energy
systems
resynthesis
production of
ATP
Energy systems provide energy aerobically or anaerobically to continue muscle contraction by
resynthesising production of ATP
Anaerobic Systems
(does not require oxygen
and is broken into two
pathways)
Creatine Phosphate
(ATP/PC; CP System)
Energy released
from breakdown of
Creatine
Phosphate
Aerobic System
(requires oxygen)
Anaerobic
Glycolysis (Lactic
Acid)
Energy released
when glucose
converts to lactic
acid
Aerobic Glycolysis
(aerobic;
cardiorespiratory)
Breakdown of
carbohydrates &
fats using oxygen
Systems
Anaerobic
Pathways
Creatine Phosphate
(ATP/PC)
Lactic Acid
Aerobic
Cardiorespiratory
Creatine Phosphate System
• Immediate source to replenish ATP
• Only lasts for 10 seconds
• Very high intensity activities
• 95% -100% of maximum heart rate
• Stores only replenished after 2 minutes of rest
• Netball examples
1. Short sprint to get into space
2. Quick burst to break free from opponent
3. Explosive leap to intercept or catch pass
Lactic Acid System
• Takes over when CP stores are depleted
• Lasts for 10 seconds – 2 minutes
• High intensity activities
• 80% -95% of maximum heart rate
• Netball examples
1.Rarely used in netball
(activities
do not last this long)
2.Ball is turned over and extended activity of
high intensity lasts for more than 20 seconds
Aerobic System
•
•
•
•
Lasts for more than 2 minutes
Sub-maximal (low intensity) activities
Less than 60% -85% of maximum heart rate
Used during rest periods after an intense activity
to rapidly repay oxygen debt to provide a
complete recovery while ATP stores are being
replenished
• Netball examples
1. High intensity when ball comes in defence but
spends more time shuffling while guarding a
player to get into a good position
2. Substitution during game to allow oxygen debt
to be repaid / while ATP stores are replenished
Oxygen deficit occurs when
ATP is produced
anaerobically leaving CP
stores depleted and lactic
acid builds in muscles &
bloodstream
To replenish our CP stores
& break down the lactic
acid, we need extra oxygen
so the respiratory and heart
rates remain high after
exercise so extra oxygen
can be consumed and the
oxygen debt paid back