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Overview of Bioenergetics Lesson

Overview of Bioenergetics Lesson. Interaction of the Energy Systems How Energy Systems work together Looking at the Energy Systems at rest at the beginning of exercise during steady state exercise during strenuous exercise during recovery.

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Overview of Bioenergetics Lesson

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  1. Overview of Bioenergetics Lesson • Interaction of the Energy Systems • How Energy Systems work together • Looking at the Energy Systems at rest at the beginning of exercise during steady state exercise during strenuous exercise during recovery

  2. 3 Energy Systems Working Together • At rest: small amounts of energy are used • At the Beginning of Exercise: If the energy system is slightly higher than rest, the aerobic system continues • If the energy demand is immediate and high, stored energy or ATP is used • CP can also help to create more energy anaerobically until the aerobic system catches up • After 20-30 seconds glycolysis kicks in

  3. Energy Systems Continued The volume of oxygen missing in the first few minutes of exercise is the oxygen deficit During Steady State Exercise: Once the supply of oxygen meets the demand…. the muscle cell creates ATP using the breakdown of glucose through the oxidation system • Oxygen uptake and heart rate level off, energy demands and energy production are balanced…steady level of exertion for an extended period of time During Strenuous Exercise: If energy demand is rapid and extended the energy demand will require the anerobic system to provide ATP

  4. 3 Energy Systems Continued: • Once ATP-CP is fatigued, the glycolytic system takes over • Fatigue or failure may result if oxygen demand exceeds supply and high intensity exercise continues beyond 2 minutes

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  6. The red area reflects ATP production by the aerobic system Within 3-5 min, the VO2 reaches a steady state indicating that the aerobic system is supplying all the energy required by the muscles. The area indicated by O2D in the above figure is defined as the oxygen deficitand reflects energy supplied to the muscles by non-aerobic systems.

  7. 3 Energy Systems Continued: • During Recovery: After exercise the body continues to take in more oxygen then it needs • The “surplus” of oxygen is thereby available to pay off the debt of oxygen that occurred at the beginning of exercise • This oxygen is known as Excess Post Exercise Oxygen Consumption (EPOC)

  8. After cessation of exercise, VO2 doesn't immediately return to resting levels, rather, VO2 makes a gradual decrease even though energy demands are only at resting levels.

  9. The elevated VO2 during exercise recovery, and the amount of EPOC is usually greater than the amount of the O2 deficit (compare the areas of the O2 deficit and EPOC in the Figure ).

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  11. What is EPOC used for? • EPOC is used for ATP and CP replenishment • If the activity was more anaerobic or intense..then the greater the oxygen deficit and more EPOC is required to return the body to a pre exercise state

  12. Other Factors of EPOC • Temperature recovery • Heart Rate recovery • Ventilation recovery • Hormone recovery

  13. Review of the 3 Systems • All systems are working at the same time • There is a predominance of one system over another depending on the intensity of the activity

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