Energy system - Responses to exercise PPT
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Transcript Energy system - Responses to exercise PPT
Energy System responses to acute
exercise
Energy systems: phosphocreatine; lactic acid;
aerobic; energy continuum; energy
requirements of different sport and exercise
activities
ATP
PC
Lactic Acid
Aerobic
Energy Systems & Exercise: The Basics
0 sec
ATP
4 sec
10 sec
1.5 min
3 min +
Strength – Power:
power lift, shot put, golf swing
ATP-PC (phosphagen)
Lactic Acid/Anaerobic Glycolysis
Sustained Power:
sprints, fast breaks, football
Anaerobic Power – Endurance:
200-400 m dash, 100 m swim
Aerobic Endurance:
Beyond 800 m run
Aerobic System
Immediate/short-term
non-oxidative systems
Aerobic-oxidative
system
Fuel, Energy systems & Exercise
• Anaerobic Energy System =
Carbohydrates are the only fuel source
• With prolonged exercise, Carbohydrates are the first fuel choice, as exercise
continues, FAT becomes predominant :
• As exercise intensity , energy supplied by Carbohydrates
• As duration , energy supplied by fat
• Protein is not a main fuel source except in an emergency :
• As glycogen , energy supplied by protein
• Each system plays an important role in energy production:
• All energy systems are “on” at all times
• This gives us a variety of movements
• The systems interact to supply Energy for the activity
Fuel, Energy systems & Exercise
% energy from FAT
40 30 20 10
% energy from CHO
40 60 80 100
As exercise gets harder, the % energy from
oxidation of Carbohydrates goes UP sharply while
the % energy from fat goes DOWN
increasing intensity of exercise
Energy Systems on a Continuum!
‘All energy systems are “on” at all times’
All three energy systems contribute
at the start of exercise but the
contribution depends upon the
individual, the effort applied or on
the rate at which energy is used.
The following graph shows how the
energy systems contribute to the
manufacture of ATP over time when
exercising at 100% effort.
The thresholds (T) indicate the point
at which the energy system is
exhausted - training will improve the
thresholds times.
Energy Systems on a Continuum!
ADENOSINE
TRIPHOSPHA
TE
(ATP)
PHOSPHOCREATINE
(PCr)
GLYCOLYSIS
(ANAEROBIC;
CHO BREAKDOWN)
KREBS
CYCLE
(AEROBIC;
CHO, FAT, AND
PROTEIN
BREAKDOWN)
Energy Systems working together:
100m SPRINT
(10 seconds of maximal exercise)
Energy Systems on a Continuum!
ADENOSINE
TRIPHOSPHA
TE
(ATP)
PHOSPHOCREATINE
(PCr)
GLYCOLYSIS
(ANAEROBIC;
CHO BREAKDOWN)
KREBS
CYCLE
(AEROBIC;
CHO, FAT, AND
PROTEIN
BREAKDOWN)
Energy Systems working together:
800 METER RUN (50 seconds)
Energy Systems on a Continuum!
ADENOSINE
TRIPHOSPHAT
E
(ATP)
PHOSPHOCREATINE
(PCr)
GLYCOLYSIS
(ANAEROBIC;
CHO BREAKDOWN)
KREBS
CYCLE
(AEROBIC;
CHO, FAT, AND
PROTEIN
BREAKDOWN)
Energy Systems working together:
MARATHON 2.5 hours of exercise
Sport, Exercise and Energy Systems
Anaerobic
Wt. Training
Gymnastics
Football
Baseball
70-80% Anaerobic
20-30%
Aerobic
Stop & Go Sports
Tennis
Soccer
Field Hockey
Aerobic
Jogging
Marathons
Cycling
Aerobic Dance
Energy System recruitment in Sport
Sport
ATP-CP and LA %
LA-Aerobic
%
Aerobic
%
Basketball
Fencing
Field events
Golf swing
Gymnastics
Hockey
Distance running
60
90
90
95
80
50
10
20
10
10
5
15
20
20
20
Rowing
Skiing
Soccer
Sprints
Swimming 1.5km
20
33
50
90
10
30
33
20
10
20
50
33
30
Tennis
Volleyball
70
80
20
5
10
15
5
30
70
70
Table adapted from Fox E. L. et al, The Physiological Basis for Exercise and
Sport, 1993