Fat and Carbohydrate: Exercise Physiology

Question 1

Fuel selection as intensity of exercise increases

Answer 1

1. When exercise begins, glucose is primary fuel
2. Sustained low intensity exercise fat oxidation predominates
3. As intensity increases, glucose oxidation predominates
4. As intensity increases further anaerobic metabolism predominates and lactate production increases

As intensity increases, do FA, then glucose, then anaerobic

Question 2

Adaptations with training

Answer 2

1. Increased muscle mass
2. More mitochondria capacity per gram of muscle
3. Increased intramuscular glycogen and TG from increased turnover
4. Increased rates of lipolysis, beta oxidation and lactate clearance
5. Result is increased work capacity and shift to fat as preferred fuel

Question 3

Adaptations with physical inactivity

Answer 3

1. Reduced muscle mass
2. Lose mitochondrial content
3. Increased intramuscular glycogen and TG from lack of use
4. Lower rates of lipolysis, beta oxidation and lactate clearance
5. Result is reduced work capacity and shift to glucose as fuel

Question 4

How much ATP per burned molecule?

Answer 4

Protein (12)