Oxygen Consumption and Excess Postexercise Oxygen Consumption
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Oxygen Consumption and Excess Postexercise Oxygen Consumption Andrew Nasr Meyer Naidas Aaron Salazar Kevin Shreffler
description
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
Transcript of Oxygen Consumption and Excess Postexercise Oxygen Consumption
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?
