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Questions and Answers
How does exercise intensity influence the primary energy system utilized?
How does exercise intensity influence the primary energy system utilized?
- Higher intensity exercise demands faster ATP production, while lower intensity exercise allows for slower, more efficient means of ATP production. (correct)
- The intensity has no effect on which energy system is used; all intensities use all systems equally.
- Higher intensity exercise primarily uses slower more efficient means of ATP production, whereas lower intensity uses faster production.
- Higher intensity exercise relies solely on fat oxidation, while lower intensity uses carbohydrates.
When does a single energy system provide the complete supply of energy during exercise or rest?
When does a single energy system provide the complete supply of energy during exercise or rest?
- At no time does any single energy system provide the total supply of energy. (correct)
- During the first few seconds of maximal exercise.
- During periods of deep sleep.
- During low-intensity, long-duration activities.
During high-intensity exercise, how quickly does stored ATP get depleted?
During high-intensity exercise, how quickly does stored ATP get depleted?
- Stored ATP lasts for about 3-5 minutes.
- Stored ATP can last for 3-5 seconds. (correct)
- Stored ATP lasts for about 8-10 minutes.
- ATP stores are never depleted during exercise.
Within what timeframe does complete resynthesis of phosphocreatine (PCr) typically occur after high intensity exercise?
Within what timeframe does complete resynthesis of phosphocreatine (PCr) typically occur after high intensity exercise?
What is the relationship between exercise intensity and glycogen depletion?
What is the relationship between exercise intensity and glycogen depletion?
What role does lactate production play during high-intensity exercise?
What role does lactate production play during high-intensity exercise?
How does a cool-down involving low-intensity exercise aid recovery after high-intensity exercise?
How does a cool-down involving low-intensity exercise aid recovery after high-intensity exercise?
What is the primary limiting factor for events of different durations?
What is the primary limiting factor for events of different durations?
Flashcards
Exercise Intensity and Energy Systems
Exercise Intensity and Energy Systems
The intensity of exercise determines which energy system is primarily used. High intensity activities demand faster ATP production, while lower intensity activities can rely on slower, more efficient ATP production.
Phosphagen System
Phosphagen System
Stored ATP is used first, lasting for only 3-5 seconds. Phosphocreatine (PCr) is then utilized, decreasing significantly during the first 5-30 seconds of high-intensity exercise. Complete resynthesis of ATP takes 3-5 minutes, while PCr resynthesis takes 8-10 minutes.
Glycogen Depletion
Glycogen Depletion
Glycogen depletion rate increases with higher exercise intensity. Above 60% of maximal oxygen uptake, glycogen becomes a crucial energy source. Intense exercise can deplete glycogen stores in muscle cells.
Glycogen Repletion
Glycogen Repletion
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Metabolic Acidosis and Lactate
Metabolic Acidosis and Lactate
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Cooldown and Recovery
Cooldown and Recovery
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Dietary Supplements and Energy
Dietary Supplements and Energy
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Energy System Limiting Factors
Energy System Limiting Factors
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Study Notes
Metabolic Regulation & Recovery
- Exercise intensity determines the primary energy system used.
- Higher intensity requires faster ATP production.
- Lower intensity allows for slower, more efficient ATP production.
- No single energy system provides complete energy supply during exercise or rest.
Biological Energy Systems
- Duration and intensity of exercise dictate the primary energy system used.
- 0-6 seconds: Extremely high intensity - Phosphagen system.
- 6-30 seconds: Very high intensity - Phosphagen and fast glycolysis systems.
- 30 seconds to 2 minutes: High intensity - Fast glycolysis.
- 2-3 minutes: Moderate intensity - Fast glycolysis and oxidative system.
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3 minutes: Low intensity - Oxidative system.
- The relationships between duration, intensity, and primary energy systems used assume best possible performance for a given event.
Substrate Depletion and Repletion - Phosphagens
- Stored ATP lasts 3-5 seconds.
- Phosphocreatine (PCr) decreases markedly (50-70%) during the first stage (5-30 seconds) of high-intensity exercise.
- PCr can be almost eliminated with very intense exercise.
- Complete ATP resynthesis takes 3-5 minutes.
- Complete PCr resynthesis occurs within 8-10 minutes.
Substrate Depletion and Repletion - Glycogen
- Glycogen depletion rate is related to exercise intensity.
- Above 60% maximal oxygen uptake, muscle glycogen is a major energy substrate.
- Entire glycogen content of some muscle cells can become depleted during exercise.
- Muscle glycogen replenishment during recovery is linked to post-exercise carbohydrate ingestion.
Lactate & Recovery
- High-intensity exercise can induce metabolic acidosis.
- Muscles produce lactate to help counteract acidity.
- A cooldown of low-intensity exercise helps flush out excess acidity and lactate.
Ranking of Bioenergetic Limiting Factors
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Ranking table (Table 2.5/3.4) shows the limiting factors for different exercises.
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Light exercise (marathon) is primarily limited by fat stores and lower pH.
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Heavy exercise (400m run) is often limited by muscle glycogen stores.
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Intense exercise (discus) is frequently limited by ATP and creatine phosphate.
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Note: There isn't a need to memorize every numerical detail of the ranking table but understanding limiting factors for different exercises is key.
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Specific dietary supplements may mitigate some of these limiting factors.
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