Fuels for ATP resynthesis

Question 1

What are the 4 fuel sources for ATP resynthesis?

Answer 1

1. Phosphocreatine
2. Glycogen
3. Fats/ triglycerides
4. Proteins

Question 2

Phosphocreatine (5 points)

Answer 2

• Resynthesise ATP in the first 10 seconds of exercise.
• Stored in the muscle cells alongside ATP for rapid access.
• Limited stores.
• Dietary sources= red meat + fish.
• Main source of energy for the ATP-PC system.

Question 3

Glycogen (6 points)

Answer 3

• Stored in the muscles and liver.
• Needs to be broken down into glucose before it can be broken down to release energy for ATP resynthesis.
• Used in both absence and presence of O2.
  1) Anaerobic (60 secs- 3mins)
  2) Aerobic (infinity)
• Glucose= soluble form of glycogen found in the blood.
• Dietary sources= complex carbs/ starches.
• Main energy source for Anaerobic Glycolytic System.

Question 4

Triglycerides/ fats (6 points)

Answer 4

• Muscular stores of fat.
• Only work in the presence of glycogen due to unreliable pace.
• At rest + endurance events it produces 2/3 of the body’s energy needs.
• 2x more energy than glycogen.
• Requires 15% more O2- predominantly used in aerobic activities.
• Main energy source in Aerobic systems.

Question 5

Proteins (5 points)

Answer 5

• Growth and repair of muscles.
• Last energy source to be used (emergency rations).
• Only used when glycogen and triglyceride stores have become depleted.
• 5% of the bodies energy needs.
• Dietary sources= meats/fish/dairy.