Transcript Energy system PPx

ENERGY SYSTEMS
ENERGY SYSTEMS
Q. Where does energy come from ?
A. The food we eat …
Carbohydrate
Fat
Protein
(only if the above 2 are lacking)
ENERGY SYSTEMS
Food
(CHO)
Digestion
Muscular
contraction
+
CO2
Energy
+
H 2O
There are two ‘TYPES’ of
ATP production
AEROBIC
ANAEROBIC
In the presence of Oxygen
In the absence of Oxygen
3 Energy Systems:
3 systems for producing energy (ATP):
It’s like a car revving through the gears
All systems are used but one dominates
1. Creatine phosphate system
ADENOSINE TRIPHOSPHATE
P
A
A
A
P
A
ATP
P
A
ADENOSINE TRIPHOSPHATE
P
A
A
A
P
A
ATP
P
A
ADENOSINE TRIPHOSPHATE
P
A
A
A
P
A
P
A
ATP
ADP + Energy + P
•The body stores
phosphocreatine in the
muscles.
•This breaks down to
provide used
phosphate to recreate
ATP
Features:
no waste products,
no 02 needed,
anaerobic
CREATINE
PHOSPHATE SYSTEM
ADENOSINE TRIPHOSPHATE
P
A
A
A
P
A
ATP
P
A
ADENOSINE TRIPHOSPHATE
P
A
A
A
P
A
P
A
ATP
ADP + Energy + P
2. THE LACTATE SYSTEM
THE SYSTEM IS
ANAEROBIC
o Glucose and
Glycogen are broken
down to restore 2/3 units
of ATP
o The limiting factor of
this system is the build
up of lactic acid which
causes the muscles to
fatigue
Only sustainable for up to
three minutes
3. THE AEROBIC SYSTEM
Mitochondria
Conversion of oxygen and nutrients
into energy takes place in the
mitochondria
PERCENTAGE OF ENERGY
100
Creatine
Phosphate
Lactic Acid
Aerobic
75
50
25
0
0.5
1
1.5
2
2.5
TIME IN MINUTES
3
3.5
4
THE ENERGY CONTINUUM
OTHER FACTORS AFFECTING THE PROPORTIONS OF ENERGY SYSTEMS

used in any given exercise activity are :
level of fitness (whether adaptations to training have included enhancement of relevant enzymes
- which would for example postpone levels of lactate accumulation)
availability of O2 and food
fuels, for example a high CHO
diet would assist replenishment
Of glycogen stores which would
then be available for glycolysis
VARIATION IN CONTRIBUTION OF
ENERGY SYSTEMS

as time progresses during intense
exercise, the following chart shows
the contribution of the different
energy systems to the resynthesis
of ATP
Draw a grid
Creatine Phosphate
Lactate
Aerobic
Task: ENERGY SYSTEMS
Put
an answer
Lactate
in each column
Define the type of system; aerobic? Anaerobic?
Phosphate
State the speed of each system- very rapid/ rapid/ slow
Name the source of energy used by each system
State (in general) how much ATP is produced? Unlimited, limited, very limited?
What Waste Products are produced?
How long does it keep u going for?
What level intensity can you do? What % of max?
How long does it take to recover?
Oxygen
Task: ENERGY SYSTEMS
Phosphate
Lactate
Oxygen
Anaerobic
Anaerobic
Aerobic
Very Rapid
Rapid
Slow
Creatine phosphate
Glycogen
Glycogen & Fat
Very Limited ATP
Limited ATP
Unlimited ATP
No waste products
Lactic Acid
No Fatiguing Waste
Products
Short Duration
(0-10 secs)
1 – 2 min of Intense
Activity
Long Duration
High Intensity
(95 – 100% max)
High Intensity
(60 – 95% max)
Low Intensity
(Up to 60% max)
Quick Recovery
(30 sec – 4 min)
20 min – 2 hrs
(to break down lactic
acid)
Time to eat and drink (to
replenish fuel stores)
THE ENERGY CONTINUUM
Weight lifting
Diving: Gymnastics
200m sprint
Ice hockey
Fencing
100m swim
each of the PC, lactic
Tennis
acid and aerobic
Hockey
100m sprint; Golf & Tennis swings;
American football
0%
100%
10
90
20
80
30
70
Lacrosse
systems contribute
some ATP during the
800m run
performance of all Boxing
sports
one or other of the200m row
energy systems 1 mile run
usually provides400m
the swim
major contribution for
a given activity 2 mile run
40
60
Soccer
50
50
200m swim; Skating
60
40
80
20
3 mile run
Skating 10 km
Marathon
90
10
100%
0%
Basketball; Baseball; Volleyball;
400m sprint
1500m run
70
30
800m swim
Cross country running; Jogging
Bowers & Fox (1988)
Aerobic
Anaerobic