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The Energy Systems

Human Physiology Unit. The Energy Systems. The Energy Systems. Anaerobic Alactic Anaerobic Lactic Aerobic (aerobic alactic ). Anaerobic Alactic. Characteristics The stored, start-up energy system of both fast and slow twitch muscle. Does not require oxygen Does not produce lactic acid

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The Energy Systems

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  1. Human Physiology Unit The Energy Systems

  2. The Energy Systems • Anaerobic Alactic • Anaerobic Lactic • Aerobic (aerobic alactic)

  3. Anaerobic Alactic • Characteristics • The stored, start-up energy system of both fast and slow twitch muscle. • Does not require oxygen • Does not produce lactic acid • Student experiences • One vertical jump • One hand squeeze • One shot put toss

  4. Anaerobic Lactic • Characteristics • Fast twitch muscle energy system • Does not require oxygen • Does produce lactic acid • Student experiences • Vertical jumps – as many as possible in 30 seconds • Hand squeeze – as many as possible in 30 seconds • 100 m sprint at 100% effort

  5. Aerobic or Aerobic Alactic • Characteristics • Slow twitch muscle energy system • Requires oxygen • Does not produce lactic acid • Student experiences • Easy jog or walk • Rope skipping at a relaxed pace • Hand squeeze – 1 squeeze per 5 seconds interval

  6. Your turn! • In groups of 3, try ONE activity from each group. • E.g. One vertical jump; as many hand squeezes as possible in 30 seconds; easy jog. • Compare how your body responded to the activity.

  7. Adenosine Triphosphate (ATP) • ATP – small energy packets – high energy in its phosphate bonds • Broken down to release energy •  immediate source of energy that can be used by a muscle to perform work • Energy used to re-synthesize ATP

  8. Adenosine Triphosphate (ATP) • Food (mainly CHO and fats) is ingested, broken down, and eventually delivered to working muscles • Food must be transformed through a series of biochemical reactions into the only energy source our muscles can use, ATP

  9. ATP-PC System • ATP-PC (phosphocreatine) system • High speed/power events – less than 10 seconds • Why is it rapid? • No long chemical reactions • No oxygen needed to be transported to muscles • ATP and PC are stored directly in the contractile mechanism of muscles

  10. Lactic Acid • If anaerobic work is followed by rest, the lactate is converted back to glycogen and stored in muscles and liver • Training programs can: • Increase the amount of CHO stored in muscles • Develop greater efficiency to anaerobically break down CHO • Therefore, greater production of ATP

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