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Energy System responses to acute exercise

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.

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Energy System responses to acute exercise

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  1. 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

  2. Energy Systems & Exercise: The Basics 0 sec 4 sec 10 sec 1.5 min 3 min + ATP Strength – Power:power lift, shot put, golf swing ATP-PC (phosphagen) Sustained Power:sprints, fast breaks, football Lactic Acid/Anaerobic Glycolysis Anaerobic Power – Endurance:200-400 m dash, 100 m swim Aerobic System Aerobic Endurance:Beyond 800 m run Immediate/short-term Aerobic-oxidativenon-oxidative systems system

  3. 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

  4. Fuel, Energy systems & Exercise As exercise gets harder, the % energy from oxidation of Carbohydrates goes UP sharply while the % energy from fat goes DOWN % energy from CHO 40 60 80 100 % energy from FAT 40 30 20 10 increasing intensity of exercise

  5. 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.

  6. ADENOSINE TRIPHOSPHATE (ATP) PHOSPHO- CREATINE (PCr) GLYCOLYSIS (ANAEROBIC; CHO BREAKDOWN) KREBS CYCLE (AEROBIC; CHO, FAT, AND PROTEIN BREAKDOWN) Energy Systems on a Continuum! Energy Systems working together: 100m SPRINT (10 seconds of maximal exercise)

  7. ADENOSINE TRIPHOSPHATE (ATP) PHOSPHO- CREATINE (PCr) GLYCOLYSIS (ANAEROBIC; CHO BREAKDOWN) KREBS CYCLE (AEROBIC; CHO, FAT, AND PROTEIN BREAKDOWN) Energy Systems on a Continuum! Energy Systems working together: 800 METER RUN (50 seconds)

  8. Energy Systems on a Continuum! ADENOSINE TRIPHOSPHATE (ATP) PHOSPHO- CREATINE (PCr) GLYCOLYSIS (ANAEROBIC; CHO BREAKDOWN) KREBS CYCLE (AEROBIC; CHO, FAT, AND PROTEIN BREAKDOWN) Energy Systems working together: MARATHON 2.5 hours of exercise

  9. Sport, Exercise and Energy Systems

  10. Energy System recruitment in Sport Table adapted from Fox E. L. et al, The Physiological Basis for Exercise and Sport, 1993

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