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Oxygen Consumption and Excess Postexercise Oxygen Consumption

Oxygen Consumption and Excess Postexercise Oxygen Consumption. Andrew Nasr Meyer Naidas Aaron Salazar Kevin Shreffler. Objectives. Describe the role of the 3 energy pathways Explain Oxygen Deficit Explain Excess Post-exercise Oxygen Consumption. Research Question:

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Oxygen Consumption and Excess Postexercise Oxygen Consumption

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  1. Oxygen Consumption and Excess Postexercise Oxygen Consumption Andrew Nasr Meyer Naidas Aaron Salazar Kevin Shreffler

  2. Objectives • Describe the role of the 3 energy pathways • Explain Oxygen Deficit • Explain Excess Post-exercise Oxygen Consumption

  3. Research Question: “Compare oxygen deficit and excess post-exercise oxygen consumption between trained and untrained subjects during sub-maximal exercise by measuring VO2.” • Hypothesis: “It is expected that a trained subject will have less oxygen deficit, reach steady state faster, and have a more rapid decrease in EPOC as compared to an untrained subject.”

  4. Terminology • “VO2” • “Oxygen Deficit” • “Steady State” • “VO2 Kinetics” • “Excess Post-exercise Oxygen Consumption”

  5. Anaerobic v. Aerobic • Anaerobic • Phosphagen • Rate: Very Rapid • Substrate: PCr • Capacity: Approx. 10 sec. • Limitation: Energy Supply • Fast Glycolytic • Rate: Rapid • Substrate: Glycogen or Glucose • Capacity: 2-3 minutes • Limitation: Lactic Acid • Aerobic • Oxidative • Rate: Slow • Substrate: All 3 Macros • Capacity: Infinite • Limitation: Slow ATP production

  6. Methods • Three subjects • 2 Trained, 1 Untrained • Cycle ergometer • 6 minute bouts • 1 minute before exercise • 3 minutes of continuous exercise, constant intensity • 2 minutes of recovery time

  7. Methods (cont.) • Medium Intensity = 150 Watts • Low Intensity = 75 Watts • 3 Trials • 1. Trained, Moderate • 2. Untrained, Moderate • 3. Trained, Low • Measured VO2 every 15 seconds

  8. Oxygen Deficit • Aerobic system cannot immediately produce ATP. (Lag appx. 2 min.) • Immediate energy comes from PCr and Glycolysis.

  9. Oxygen Deficit • Portion of exercise where Aerobic system cannot provide sufficient ATP • Trained Vs Untrained • Warm-up

  10. Excess Post-Exercise Oxygen Consumption (EPOC) • VO2 continues post work-out • Decrease with recovery • Duration & Intensity dependent • Trained Vs. Untrained

  11. EPOC

  12. Conclusion • Any subject will: • Reach Steady State • Have O2 Deficit • Experience EPOC • Trained subjects will: • Reach SS Faster • Have Less O2 Deficit • Experience Less EPOC

  13. Questions?

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