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Energy Systems – ERA Laboratory

Energy Systems – ERA Laboratory. Key information and terminology. Energy for muscle contraction – 3 steps. ATP BREAKDOWN ATP RESYNTHESIS BREAKDOWN OF FOOD / FUELS. ATP DEMAND. 2 factors determine ATP demand required by a sports event:

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Energy Systems – ERA Laboratory

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  1. Energy Systems – ERA Laboratory Key information and terminology

  2. Energy for muscle contraction – 3 steps • ATP BREAKDOWN • ATP RESYNTHESIS • BREAKDOWN OF FOOD / FUELS

  3. ATP DEMAND • 2 factors determine ATP demand required by a sports event: • DURATION – total amount of energy produced (CAPACITY) • INTENSITY- rate of energy production (POWER)

  4. POWER vs CAPACITY • When discussing energy systems we often talk about the power of a system, this is simply how fast it resynthesises atp. • When we discuss the capacity of an energy system we are talking about the amountof atp a system can resynthesise.

  5. How much ATP do we need? • ERA will talk about the need for breaking down and resythesising atp for muscles to contract. • An average 70kg male needs 190kg of atp in 24 hours. We only have 50 grams stored in our muscles. • After the 50 grams runs out we need to resythesise atp via one of the 3 energy systems.

  6. Energy for muscle contraction • Energy for muscle contraction comes from breaking the BOND between the 2nd and 3rd atp molecule. • This results in the following: ATP ADP + Pi + energy • Melissa demonstrated this when breaking the grip on Molly Sweetings hand.

  7. THE 3 ENERGY SYSTEMS • There are 3 energy systems that enable atp to resynthesise. • ATP PC System - does NOT require O2 • Lactic Acid System -does NOT require O2 • Aerobic System – does require O2 What are some other names used for these energy systems?

  8. INTERPLAY – they are all working which one is dominant? INTERPLAY

  9. ATP PC SYSTEM • This system first uses the stored 50 grams of atp in the muscle. This only last 1-2 contractions. • It then uses the fuel phosphocreatine or PC that is found in the muscle. PC only lasts 1-10 seconds then stores are depleted. • It is the quickest energy system to respond to energy demand.

  10. ATP PC SYSTEM continued

  11. LACTIC ACID SYSTEM

  12. What is LACTIC ACID? • Lactate + hydrogen = LACTIC ACID • It is what we call a METABOLIC BYPRODUCT. • Lactate can be used for a fuel source however hydrogen ions build up and fatigue the muscle.

  13. HYDROGEN ACCUMULATION • When lactic acid builds up – hydrgoen ions effect the muscle in the following ways: • muscle acidity Ph • Inhibits enzymes – slows reactions • ATP resynthesis • Fatigue results – athletes slows

  14. Lactic Acid – why do we measure it? • Lactic Acid is produced when we use the anaerobic glycolysis energy system to produce ATP and occurs when the aerobic system is not able to fully meet the ATP demands of the exercise. • We measure lactate – which found in the blood. This is not a true reflection of lactic acid production as it is not reflecting muscle lactic acid levels. What else is in blood that actually breaks down lactic acid? • Lactate can help us work out an athletes INTENSITY

  15. What is LIP? • Lactate Inflection Point. • Is the intensity at which an accumulation of blood lactate occurs and is used to assess an athletes fitness. The more trained the athlete the later LIP occurs…how does this give an athlete an edge over the competition?

  16. LIP • Used to be called anaerobic threshold or lactate threshold. It usually occurs at 4m/mol. Elite athletes maximal levels of lactate are between 10-20m/mol. • It effects aerobic events

  17. LIP – when it occurs • When an athlete exceeds LIP – the following occurs: • time to exhaustion • anaerobic metabolism • lactic acid accumulation • hydrogen ion accumulation REMEMBER – the aerobic system is dominant when LIP occurs – explain.

  18. Why did we monitor his heart rate? • Heart rate indicates INTENSITY. • This helps us determine what energy system he is PREDOMINANTLYusing to resynthesise atp.

  19. AEROBIC SYSTEM

  20. Things to remember… • FATS can only be broken down when using oxygen (and lots of it), therefore it can NEVER be used for fuel in the ATP PC or LACTIC ACID SYSTEMS. • When describing the fuel – don’t just say CARBOHYDRATE as you need to be more specific – GLUCOSE or GLYCOGEN. • Holden = CHO • Barina = Glycogen or Glucose

  21. Things to remember • Protein is used only in the aerobic system – but very rarely. • Amino Acids are found in the blood, muscle and excess is stored in adipose tissue around the body.

  22. VO2 Max test results Active 40-50ml/kg/min Moderately trained 50-55ml/kg/min Well trained 60-65ml/kg/min Elite >65ml/kg/min ATHLETES –typical values AFL60-65 ml/kg/min Triathlon(M)65-80ml/kg/min Triathlon (F)60-70ml/kg/min

  23. Questions… • List the 3 energy systems • List the anaerobic fuel sources • List the aerobic fuel sources • List where each type of fuel is located • List when each energy system is dominant • Identify the most powerful energy system • List the differences between energy systems • Explain interplay of energy systems

  24. Which is the dominant Energy System? • Diving (springboard) • 200 metre sprint • One hour jog • Triathlon – 3 hour duration • Ultra marathon • 50 metre freestyle race WHY? Use duration and intensity in your explanation.

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