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Energy System responses to acute exercise ATP PC Lactic Acid Aerobic ATP PC Lactic Acid Aerobic Energy systems: phosphocreatine; lactic acid; aerobic;

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Presentation on theme: "Energy System responses to acute exercise ATP PC Lactic Acid Aerobic ATP PC Lactic Acid Aerobic Energy systems: phosphocreatine; lactic acid; aerobic;"— Presentation transcript:

1 Energy System responses to acute exercise ATP PC Lactic Acid Aerobic ATP PC Lactic Acid Aerobic Energy systems: phosphocreatine; lactic acid; aerobic; energy continuum; energy requirements of different sport and exercise activities

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

3 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 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

4 % energy from CHO increasing intensity of exercise % energy from FAT As exercise gets harder, the % energy from oxidation of Carbohydrates goes UP sharply while the % energy from fat goes DOWN Fuel, Energy systems & Exercise

5 ‘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.  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!

6 ADENOSINE TRIPHOSPHA TE (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 TRIPHOSPHA TE (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 800 METER RUN (50 seconds)

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

9 Anaerobic 70-80% Anaerobic 20-30% Aerobic Wt. TrainingStop & Go SportsJogging GymnasticsTennisMarathons FootballSoccerCycling BaseballField HockeyAerobic Dance Sport, Exercise and Energy Systems

10 Energy System recruitment in Sport SportATP-CP and LA %LA-Aerobic % Aerobic % Basketball6020 Fencing9010 Field events9010 Golf swing955 Gymnastics80155 Hockey Distance running Rowing Skiing33 Soccer Sprints9010 Swimming 1.5km Tennis Volleyball80515 Table adapted from Fox E. L. et al, The Physiological Basis for Exercise and Sport, 1993


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