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Questions and Answers
What role does inorganic phosphate play during sprint exercise?
What role does inorganic phosphate play during sprint exercise?
Which factor does NOT influence fuel use during exercise?
Which factor does NOT influence fuel use during exercise?
During the first three seconds of a 100m sprint, what primarily provides ATP?
During the first three seconds of a 100m sprint, what primarily provides ATP?
What happens to ATP turnover during the first few seconds of intense exercise?
What happens to ATP turnover during the first few seconds of intense exercise?
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Which statement correctly describes lactic acid during anaerobic metabolism?
Which statement correctly describes lactic acid during anaerobic metabolism?
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What is the primary energy supply for activities lasting 0-10 seconds?
What is the primary energy supply for activities lasting 0-10 seconds?
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Which factor does NOT significantly affect the capacity of the phosphagen system?
Which factor does NOT significantly affect the capacity of the phosphagen system?
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During a 30-second Wingate test, which energy system is primarily utilized after the initial seconds?
During a 30-second Wingate test, which energy system is primarily utilized after the initial seconds?
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How long can creatine phosphate (CP) stores supply energy during high intensity exercise?
How long can creatine phosphate (CP) stores supply energy during high intensity exercise?
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What happens to ATP stores during very intense exercise?
What happens to ATP stores during very intense exercise?
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Which of the following correctly describes the replenishment timing of CP and ATP stores?
Which of the following correctly describes the replenishment timing of CP and ATP stores?
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Which process primarily fuels energy production for moderate to high intensity activities lasting 30 seconds to 2-3 minutes?
Which process primarily fuels energy production for moderate to high intensity activities lasting 30 seconds to 2-3 minutes?
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What best characterizes the rate and capacity of ATP generation in the phosphagen system?
What best characterizes the rate and capacity of ATP generation in the phosphagen system?
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In a hypoxic environment, which fuel source predominantly contributes to ATP production?
In a hypoxic environment, which fuel source predominantly contributes to ATP production?
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What is the approximate duration that stored ATP can fuel high-intensity activity?
What is the approximate duration that stored ATP can fuel high-intensity activity?
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Study Notes
Anaerobic Energy Systems
- Anaerobic pathways liberate energy without the presence of oxygen.
- Triggers include high intensity exercise, short burst activities, and limited oxygen availability.
- The 30-second Wingate Sprint is a common assessment for anaerobic threshold.
- Lactic acid is a byproduct of anaerobic glycolysis. It is not a waste product, but rather a fuel source.
- Lactic acid actually buffers acid production from glycolysis by alkalinizing the reaction.
- Lactic acid does not cause fatigue.
- EPOC (excess post-exercise oxygen consumption) and oxygen deficit are related to the body's recovery from anaerobic activity.
Phosphagen System (ATP-CP)
- The phosphagen system provides the primary energy source for high-intensity activities lasting up to 10 seconds, such as sprinting and weight training.
- It is active at the start of all exercise, regardless of intensity.
- Stored ATP is the initial fuel source, lasting approximately 2-3 seconds.
- Stored creatine phosphate (CP) is used to resynthesize ATP for an additional 3-10 seconds.
- The phosphagen system has a fast rate of ATP generation but a low capacity due to fuel depletion.
- The amount of stored fuel and enzyme activity (ATPase and Creatine Kinase) are crucial for efficient ATP production.
Glycolysis (Anaerobic Glycolysis / Lactate System)
- Anaerobic glycolysis breaks down carbohydrates (blood glucose and muscle glycogen) to produce ATP in the cytosol of a muscle cell.
- It provides energy for moderate to high-intensity activities lasting from 30 seconds to 2-3 minutes.
- It occurs in a hypoxic (anaerobic) environment.
- Glucose and glycogen are the primary fuels.
- The conversion of pyruvate to lactate regenerates NAD+, allowing glycolysis to continue.
- Lactate formation occurs when the rate of energy demand (flux) surpasses the capacity of the mitochondria to use pyruvate aerobically.
- Lactate is a preferred energy source and can be reversed back to pyruvate for further energy production.
The 30-Second Wingate Sprint
- The 30-second Wingate sprint utilizes multiple energy systems.
- Initial ATP/PCr provides the initial energy burst.
- Anaerobic glycolysis is the primary energy source for the majority of the sprint.
- Glucose from aerobic metabolism (using CHO) contributes to the energy production.
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Description
This quiz covers the anaerobic energy systems including the phosphagen system and lactic acid production. Understand how these pathways function in high-intensity exercise and their role in energy production without oxygen. Explore concepts like EPOC and the 30-second Wingate Sprint assessment.
