What is the contribution of creatine phosphate, glycolysis and aerobic metabolism to ATP yield durin

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What is the contribution of creatine phosphate,
glycolysis and aerobic metabolism to ATP yield
during exercise?

• Erin Deasy, Miriam Reynolds,
• Kelly Staples, April Stewart

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ATP energy production
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An illustration of energy yield during exercise
Creatine Phosphate
Glycolysis
Aerobic Respiration
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Creatine Phosphate
Figure 12-13 Phosphocreatine
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• Glycolysis, like creatine phosphate, does not
  require oxygen to operate. Aerobic metabolism
  needs oxygen.

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Aerobic Metabolism

• Occurs during light and moderate exercise
• About 30 ATP/glucose molecule
• Aerobic exercise uses both fatty acids and
  glucose for ATP production
• Fatty Acid breakdown is slower
• Aerobic metabolism supports exercise for hours

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Calorimetry Measure of heat energy

• Aerobic Metabolisms contribution to ATP yield
  can be measured via indirect calorimetry.
• Aerobic metabolism is the only system that
  requires oxygen.
• Indirect Calorimetry measures oxygen up-take
  during aerobic exercise to estimate energy
  expenditure.
• Energy transformation for Oxygen
• 5.0 kcal per liter of oxygen consumed
  (conversion factor for estimating energy
  expenditure under aerobic metabolism).
• An increase in temperature decreases oxygen
  binding at the hemoglobin.
• Inadequate amount of oxygen is absorbed at
  tissues causing a higher level in oxygen
  consumption.
• Open-circuit spirometry to estimate exercise
  energy expenditure.

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Analogy

• Phosphocreatine accessible cash in your wallet
• - money you withdraw from the bank that sits in
  your wallet ready for use at any time
• - this runs out quickly because you cant carry
  much
• Anaerobic Glycolysis using your credit card
• Oxygen debt leads to lactic acid build up you
  must repay O2 debt to get rid of it
• Like charging your account to purchase items that
  youll have to make payments on later
• Electron transport system as you get paid from
  your job, money being ATP, you pay for the things
  that you need
• You pay for items at the time you swipe your
  debit card
• No debt occurs that you have to pay back because
  you already have the money in your bank account