Aerobic Energy System Notes

Aerobic Energy System

Overview

  • The aerobic energy system resynthesizes ATP with oxygen (aerobically).
  • Typically used for low to moderate intensity activities lasting longer than 90 seconds.
  • Examples include:
    • Extended periods of walking
    • A 15-kilometer jog
    • 'Invasion' and 'Net and Court' activities with slower, sustained movement, such as:
      • A soccer midfielder moving the ball around before an attack.
      • A center basketball player defending in a zone defense.

Tasks

  • Task 1: Complete the interactive video task on D2L.
  • Task 2: Complete the Data Analysis Task on D2L.
    • Part 1: Identify points where the individual predominantly uses the aerobic energy system, justifying with HR Zones.
    • Part 2: Identify and outline the process occurring when predominantly using the aerobic energy system to synthesize ATP.
  • Task 3: Complete the Aerobic Energy System Identification Task on D2L.

How the Aerobic System Works

  • Supplies energy to produce ATP at rest and during lower to moderate intensity physical activity.
  • Glycogen and/or fat are combined with oxygen to produce energy.
  • By-products are water and carbon dioxide.
  • This process is called Aerobic Glycolysis.
  • The process is similar to Anaerobic Glycolysis (Lactic Acid System), but the aerobic system uses oxygen.
  • Note: Lactic Acid is produced in both forms of glycolysis.

Fuel Preference

  • The aerobic system is the preferred energy source for activities requiring lower intensity over extended periods, such as distance running.
  • Fat is the preferred energy source at rest or during low-intensity activities.
  • Glycogen becomes the preferred fuel source when exercise intensity approaches 60% of maximum heart rate, which can be calculated as 220 - age.

Duration of ATP Production

  • Provided there is adequate oxygen supplied to muscle cells, this process can continue to produce energy indefinitely.
  • Factors limiting continued activity include:
    • Muscle soreness
    • The need for rest
    • Muscle fatigue
    • Diminishing levels of glycogen and fat reserves