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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: - PowerPoint PPT Presentation
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Oxygen Consumption and Excess Postexercise Oxygen Consumption
Andrew NasrMeyer NaidasAaron Salazar
Kevin Shreffler
ObjectivesDescribe the role of the 3 energy pathwaysExplain Oxygen DeficitExplain Excess Post-exercise Oxygen Consumption
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.”
Terminology“VO2”“Oxygen Deficit”“Steady State”“VO2 Kinetics”“Excess Post-exercise Oxygen Consumption”
Anaerobic v. AerobicAnaerobic
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
MethodsThree subjects
2 Trained, 1 Untrained
Cycle ergometer6 minute bouts
1 minute before exercise 3 minutes of continuous
exercise, constant intensity
2 minutes of recovery time
Methods (cont.)Medium Intensity = 150 WattsLow Intensity = 75 Watts3 Trials
1. Trained, Moderate 2. Untrained, Moderate 3. Trained, Low
Measured VO2 every 15 seconds
Oxygen DeficitAerobic system cannot
immediately produce ATP. (Lag appx. 2 min.)
Immediate energy comes from PCr and Glycolysis.
Oxygen DeficitPortion of exercise
where Aerobic system cannot provide sufficient ATP
Trained Vs Untrained
Warm-up
Excess Post-Exercise Oxygen Consumption (EPOC)VO2 continues post
work-out
Decrease with recovery
Duration & Intensity dependent
Trained Vs. Untrained
EPOC
ConclusionAny subject will:
Reach Steady State Have O2 Deficit Experience EPOC
Trained subjects will: Reach SS Faster Have Less O2 Deficit Experience Less EPOC
00.5
11.5
2
Untrained Moderate
Time (sec)
VO2
(L/m
in)
0
1
2
Trained Moderate
Time (sec)
VO2
(L/m
in)
Questions?
