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 VO 2.” 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 “VO 2 ” “Oxygen Deficit” “Steady State” “VO 2 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 VO 2 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 O 2 Deficit Experience EPOC Trained subjects will: Reach SS Faster Have Less O2 Deficit Experience Less EPOC

13. Questions?