Fuel Utilization - In Lab Questions

Question 1

Oxygen ____ is the lag in oxygen uptake at the beginning of exercise

Answer 1

deficit

Question 2

What is happening during the oxygen deficit?

Answer 2

aerobic system can’t produce ATP fast enough (oxygen deficit) to keep up with the demand, therefore the anaerobic system is relied upon for immediate ATP production

Question 3

What two things can cause the oxygen deficit?

Answer 3

1. inadequate O2 delivery to the muscle

2. failure of oxidative phosphorylation to increase immediately when exercise begins

Question 4

What is EPOC?

Answer 4

excess post-exercise oxygen consumption = consumption of higher levels of O2 post-exercise compared to at rest

Question 5

Causes of EPOC? (6)

Answer 5

1. Convert lactate produced –> glucose
2. Resynthesize PC in muscles
3. Restoration of muscle and blood oxygen
4. Some O2 goes to lowering HR and BP
5. Elevated body temperature = increased metabolic rate
6. Elevated hormones of epinephrine and nor-epinephrine

Question 6

Why is EPOC greater during high intensity exercise? (4)

Answer 6

1. greater heat production and body temperature
2. PC is depleted to a greater extent
3. higher BLa levels
4. higher epi and nor-epi levels

Question 7

Slow vs Fast EPOC?

Answer 7

you see slow EPOC when O2 is required to convert lactate to glucose (gluconeogenesis) in the liver

Question 8

Light vs moderate exercise and recovery - %fat and %CHO

Answer 8

Light:

• exercise = 50/50
• recovery = 33% fat and 67% CHO

Moderate:

• exercise = 33% fat, 67% CHO
• recovery = 100% CHO