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Copy of Anaerobic Energy Systems and their use in sport
Transcript of Copy of Anaerobic Energy Systems and their use in sport
Watch the following video. Select 2 sports and write a paragraph for each. You must ensure that your paragraph proves you have made outstanding progress In pairs: Using the 800m race below can you use your whiteboard to complete the following: (cc) image by anemoneprojectors on Flickr Good Outstanding A-B C Describe the characteristics of both anaerobic energy systems and suggest advantages and disadvantages of each Discuss the relationship between both anaerobic energy systems Suggest the fuel used for anaerobic resynthesis of ATP and the quantity of ATP that is resynthesised through each system Anaerobic Lesson 1 After anaerobic/intense exercise has stopped the need for O2 remains high due to the excess post exercise oxygen consumption (EPOC). This can occur either at rest or when exercise has become aerobic again (cool down).
This is to ensure the following occur:
Restore ATP levels (48-72hrs to return to normal)
Restore PC levels (rapid, P + C + energy = PC)
Reduce Lactic Acid (next slide)
Reload Myoglobin with O2
The final part of recovery which is restoring glycogen stores doesn’t require O2. Post Exercise Lactic Acid System This is dependent upon 2 main factors
Duration of exercise
Intensity of Exercise
With most sports you will use all types of energy systems in the duration of the exercise (aerobic, lactic acid & ATP – PC) depending on the supply and demand oxygen relationship.
It is important that you are aware of predominant energy systems at different points of exercise. What exercise and what energy system? As exercise begins the dramatic demand for oxygen means we cannot meet the mitochondria's need for O2 as a result an O2 deficit builds (crossed the lactate threshold)
When exercise stops we don’t immediately return to resting values this is the EPOC.
Fast Alactacid: ATP and PC stores are restored and myoglobin is reloaded with O2
Slow/Lactacid: Oxygen sees the lactic acid converted to pyruvic acid and enter krebs cycle, or converted into glucose in the liver. Recovery and EPOC The quantity of lactic acid is determined by how long you work after OBLA. This must be dealt with as:
It will cause muscle fatigue
Lactic acid can be used as a source of energy (waste product????)
Excess lactic acid is dealt with in the following ways:
With the use of O2 it can be reconverted into pyruvic acid and then enter the krebs cycle as normal
Be transported to the liver where with the use of O2 it can be converted into glucose. Excess Lactic Acid There are obvious differences in VO2 max of different people:
Untrained “V” Trained
Man “V” Women
Elderly “V” Young
VO2 max is largely genetically determined and can only be slightly changed with training by improving the efficiency of certain processes such as the delivering O2 to the muscle. VO2 Max “The decline in muscle function as a result of repeated contractions”
This can be brought about by:
Build up of lactic acid
Depletion of glucose.
Fatigue, and how it is brought about is dependent upon the type of exercise
Low intense but prolonged exercise will see fatigue as a result of depletion of glycogen
High intense, short, sharp bursts will see depletion of PC causing fatigue
High intense, but slightly longer exercise will see fatigue caused by lactic acid build up. Muscle Fatigue ATP-PC System OBLA changes with training As exercise intensity increases the demand for O2 by the muscles (mitochondria) increases too. When we can longer meet the demand we begin to resynthesis ATP anaerobically and this causes the production of lactic acid.
Lactic acid now begins to accumulate in the muscle and blood, this is known as the “onset of blood lactate accumulation” (OBLA).
The higher the VO2 max the later the lactate threshold/OBLA as when you hit your VO2 max you then begin to work anaerobically. Fatigue and the lactate threshold Phosphocreatine is an energy rich compound that when broken down releases energy for the resynthesis of ATP (no oxygen is required for this).
PC C + P + Energy
ATP P + ADP + Energy ATP-PC System 2 ATP H+
H+ Lactic Acid Not enough O2 to combine with H+ to produce H2O (NO ATP) H+ H+ H+ H+ H+ H+ Pyruvic acid Glucose Lactic Acid System Describe the characteristics of both anaerobic energy systems and suggest advantages and disadvantages of each Task: Read the text you have been given and suggest 3 advantages and disadvantages of the ATP - PC to a peer Task: Read the text you have been given and suggest 3 advantages and disadvantages of the lactic acid system to a peer (cc) image by anemoneprojectors on Flickr Good Outstanding A-B C Describe the characteristics of both anaerobic energy systems and suggest advantages and disadvantages of each Discuss the relationship between both anaerobic energy systems Suggest the fuel used for anaerobic resynthesis of ATP and the quantity of ATP that is resynthesised through each system Anaerobic Lesson 1 Describe the characteristics of both anaerobic energy systems and suggest advantages and disadvantages of each