Exersize and starvation overview

Question 1

What is the sequence of events after feeding leading to starvation?

Answer 1

• for 2 hrs can use glucose and fat from gut
• 2-10 hrs after, you use liver glycogen stores to maintain blood glucose and start using fatty acids to help fuel some metabolic processes- preserving glucose for RBCs and the brain
• 8-10 hrs after you start needing to make new glucose from amino acids, glycerol and lactate
• then starvation: cortisol release, causing fat and protein breakdown, liver starts producing ketone bodies from fat breakdown and brain adapts to be able to use these instead of glucose

Question 2

describe the sources of energy used during a sprint?

Answer 2

• first 2 seconds supplied by ATP
• 5 seconds supplied by creatine phosphate
• rest needs glycolysis and anerobic resp (pyruvate to lactate by pyruvate dehydrogenase) and break down of muscle glycogen

Question 3

Describe the scource of energy for long term low intensity exersize?

Answer 3

• fatty acid oxidation

- glycogen stores can last about an hr

Question 4

What is the name of the cycle which recycles lactate?

Answer 4

cori cycle

Question 5

What are the benefits of exersize? (6)

Answer 5

• body composition changes (less fat)
• glucose tolerance improves (more glycogenesis)
• sensitivity to insulin increases
• blood TAG decrease (less LDL and VLDL, more HDL)
• blood pressure falls
• psychological effects