Lactic Acid system Tuesday 19 th  September ‘ Make notes not copies’  (just right down the important points, listen to the...
Lactic Acid System <ul><li>After about 8 seconds the muscle starts to use its glucose stores to replenish ATP by the proce...
<ul><li>The lactic acid system is the prominent energy provider between 10 seconds and 2-3 minutes into exercise. </li></u...
<ul><li>Glucose </li></ul><ul><li>    ADP </li></ul><ul><li>Glucose - 6 - phosphate </li></ul><ul><li>    ADP </li></ul><u...
Onset Blood Lactate Accumulation <ul><li>point where lactic acid levels increase exponentially </li></ul><ul><li>this decr...
 
<ul><li>TAKE A BREAK! </li></ul>
THERE IS LIFE AFTER  LACTIC ACID
Lactic Acid resynthesis <ul><li>The Cori Cycle (20%) </li></ul><ul><ul><li>lactic acid in muscle > blood > glycogen in the...
Excess Post - Exercise  Oxygen  Consumption <ul><li>oxygen consumed after exercise to make up for that missed during anaer...
Identifying Key Points <ul><li>Look through the notes you have just made and think… </li></ul><ul><li>What are the key poi...
Exam Questions  <ul><li>Name the predominant energy pathway that would be utilised, and describe the chemical reactions th...
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Lactic acid sys epoc-obla

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Lactic acid sys epoc-obla

  1. 1. Lactic Acid system Tuesday 19 th September ‘ Make notes not copies’ (just right down the important points, listen to the rest).
  2. 2. Lactic Acid System <ul><li>After about 8 seconds the muscle starts to use its glucose stores to replenish ATP by the process of Glycolysis </li></ul><ul><li>Glucose molecules go through a series of decompositional reactions to produce pyruvate releasing energy and hydrogen ions </li></ul><ul><li>Occurs in the cytoplasm of the muscle cells outside the mitochondria </li></ul>
  3. 3. <ul><li>The lactic acid system is the prominent energy provider between 10 seconds and 2-3 minutes into exercise. </li></ul><ul><li>Energy provider when operating between 70-90% VO 2 max </li></ul><ul><li>With training athletes ability to resist the fatiguing effects of lactic acid increases – Why? </li></ul>
  4. 4. <ul><li>Glucose </li></ul><ul><li> ADP </li></ul><ul><li>Glucose - 6 - phosphate </li></ul><ul><li> ADP </li></ul><ul><li>Fructose 1,6 phosphate </li></ul><ul><li>2ATP 2ATP </li></ul><ul><li>Pyruvate Pyruvate </li></ul><ul><li>Lactic acid Lactic acid </li></ul><ul><li>2NADH + H* </li></ul>
  5. 5. Onset Blood Lactate Accumulation <ul><li>point where lactic acid levels increase exponentially </li></ul><ul><li>this decreases PH levels affecting the functioning of phosphofructokinase preventing further ATP synthesis </li></ul><ul><li>also affects cross bridge formation in muscle contraction </li></ul><ul><li>trained athlete - 70-80% VO 2 max </li></ul><ul><li>untrained athlete - 50-60% VO 2 max </li></ul>
  6. 7. <ul><li>TAKE A BREAK! </li></ul>
  7. 8. THERE IS LIFE AFTER LACTIC ACID
  8. 9. Lactic Acid resynthesis <ul><li>The Cori Cycle (20%) </li></ul><ul><ul><li>lactic acid in muscle > blood > glycogen in the liver </li></ul></ul><ul><li>Lactate Shunting (70%) </li></ul><ul><ul><li>Type I fibres > oxidised for energy </li></ul></ul><ul><li>Converted into Protein (10%) </li></ul><ul><li>50% in approximately 15 minutes, 100% in around an hour, dependent on….? </li></ul>
  9. 10. Excess Post - Exercise Oxygen Consumption <ul><li>oxygen consumed after exercise to make up for that missed during anaerobic period at the beginning of movement (graph) </li></ul><ul><li>returns the body to homeostasis by removing waste products of exercise </li></ul><ul><li>With training the time it takes to return to homeostasis changes – How and why? </li></ul>
  10. 11. Identifying Key Points <ul><li>Look through the notes you have just made and think… </li></ul><ul><li>What are the key points to be taken from this energy system? </li></ul><ul><li>How might they be turned into questions? </li></ul><ul><li>What would you want know about this system if you were going to train it? </li></ul>
  11. 12. Exam Questions <ul><li>Name the predominant energy pathway that would be utilised, and describe the chemical reactions that would occur, in an athlete in a 400m race. (6) </li></ul><ul><li>Identify how the body utilises lactic acid during the lactacid oxygen recovery. (3) </li></ul><ul><li>Sprinters and endurance athletes train to delay a particular energy pathway from becoming the dominant energy provider. </li></ul><ul><ul><li>Identify the pathway and state why both types of athlete seek to delay it. (3) </li></ul></ul><ul><li>The OBLA is important for many athletes. Explain the term and identify why it would be significant for different types of athlete. (6) </li></ul>
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