Energy Systems and Intensity

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary source of energy for the ATP-PC system?

Glucose molecule
Lactic acid
Oxygen
Glycogen (correct)

Above what percentage of maximum heart rate is the ATP-PC system predominantly used?

70%
95% (correct)
85%
80%

What is the byproduct of anaerobic glycolysis in the muscles?

Oxygen
Glycogen
Hydrogen ions
Lactic acid (correct)

What is the term for the process of rebuilding ATP and PC stores?

Re-synthesis (B) Signup and view all the answers

How long does the ATP-PC system typically last?

10 seconds (A) Signup and view all the answers

What is the intensity level below which the aerobic system is predominantly used?

70% maximum heart rate (A) Signup and view all the answers

What is the purpose of the ATP-PC system?

To provide energy for high-intensity exercises (D) Signup and view all the answers

What is the result of hydrogen ion accumulation in the muscles?

Fatigue (D) Signup and view all the answers

What is the maximum heart rate percentage that can be sustained for around 90 seconds?

85% (A) Signup and view all the answers

Why does the brain start to experience fatigue when glucose is depleted?

Because the brain needs glucose to function (D) Signup and view all the answers

What is the term for the process of metabolizing fats when glucose is depleted?

Fat Metabolism (B) Signup and view all the answers

How many ATP molecules are produced from one glucose molecule during anaerobic glycolosis?

2 (D) Signup and view all the answers

What is the term for the phenomenon of suddenly feeling exhausted during intense exercise?

Hitting the Wall (D) Signup and view all the answers

What is the primary source of energy for the brain?

Glucose (A) Signup and view all the answers

What happens to the reliance on carbs as intensity increases?

It increases (B) Signup and view all the answers

What is the dominant energy system when oxygen supply meets demand?

Aerobic energy system (B) Signup and view all the answers

What is the result of lack of oxygen during high-intensity exercise?

Lactic acid buildup (A) Signup and view all the answers

What is the highest point at which lactate and hydrogen ions production equals removal?

Lactic inflection point (B) Signup and view all the answers

What is the term for the amount of oxygen that can be taken up, transported, and used by working muscles?

Vo2 Max (C) Signup and view all the answers

What is the effect of aerobic training on the lactic inflection point?

It increases the LIP (D) Signup and view all the answers

What is the term for the excessive post-exercise oxygen consumption?

EPOC (B) Signup and view all the answers

What is the result of anaerobic glycolysis increasing the amount of ATP it rebuilds?

Inhibited muscle control (B) Signup and view all the answers

What dictates which energy system is dominant?

Intensity and duration (A) Signup and view all the answers

What is the term for the point at which oxygen supply does not meet demand?

Oxygen deficit (D) Signup and view all the answers

What is the duration of the stored energy in muscles?

2-3 seconds (D) Signup and view all the answers

What is the primary source of energy for rebuilding ATP?

Phosphocreatine (D) Signup and view all the answers

What is the stored form of carbohydrates in the body?

Glycogen (D) Signup and view all the answers

How much ATP is rebuilt from one PC molecule?

0.7 of an ATP (D) Signup and view all the answers

What is the role of carbohydrates in the energy production process?

They are broken down into glucose (C) Signup and view all the answers

What is the primary purpose of glycogen in the body?

To provide energy for high-intensity exercise (D) Signup and view all the answers

What is the relationship between phosphocreatine and ATP?

Phosphocreatine is used to rebuild ATP (C) Signup and view all the answers

What is the energy source that is synthesized from food sources?

Glycogen (B) Signup and view all the answers

Flashcards are hidden until you start studying

Study Notes

Energy Systems

As intensity increases, the reliance on carbs (glucose) increases.
The duration and intensity of an activity dictate which energy system is dominant.

Energy System Interplay

All energy systems work in unison to provide energy.
The amount of oxygen that can be taken up, transported, and used by working muscles determines the dominant energy system.

Aerobic System

The aerobic system is the main way to build ATP when heart rate is below 70%.
It is the slowest to build ATP.
When glucose is depleted, the body starts to metabolize fats.
The brain needs glucose to function.

Anaerobic Glycolysis

Anaerobic glycolysis has to increase the amount of ATP it rebuilds due to lack of oxygen.
At this point, lactic acid begins to build up due to lack of oxygen.
The lactic acid inflection point occurs at 85% MHR.
Can train to have a higher lactic acid inflection point through aerobic training.

ATP-PC System

Stored in muscles, ATP-PC system only lasts 2-3 seconds.
One PC molecule rebuilds 0.7 of an ATP.
Can be rebuilt aerobically and anaerobically.
Runs out fast and rebuilds fast.

Energy Systems Comparison

ATP-PC system: no oxygen used, lasts around 2-3 seconds, and rebuilds fast.
Anaerobic glycolysis: no oxygen used, lasts around 10 seconds, and produces lactic acid.
Aerobic system: uses oxygen, lasts around 90 seconds, and is the slowest to build ATP.

Lactic Acid Release

Lactic acid release inhibits muscle contractions.
Hydrogen ions, which are produced, can be rebuilt back into ATP or glucose.

Glycogen Breakdown

Glycogen breaks down fast, but because there is no oxygen, it produces lactic acid.
If the intensity is below 85% MHR, then H+ may not reach fatigue levels, called hitting the wall.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.