HIIT Exercise- PCr depletion and Carbohydrate Availability W2

Question 1

When is PCr hydrolysis essential?

Answer 1

Essential to ATP turnover during maximal activity <10 seconds

Question 2

What is PCr and glycogen utilisation like in muscle fibres during treadmill sprinting?

Answer 2

Greater in Type II fibres compared to type I Fibres

Question 3

What is the restoration of power like during a maximal 30-second sprint?

Answer 3

Paralleled by resynthesis of PCr despite muscle pH remaining low

Question 4

How does a 4 minute recovery period after a 30 second sprint influence Pr resynthesis in type I and type II muscle fibres?

Answer 4

Type I: Resynthesis is almost complete in type I fibres

Type II: Not sufficient for PCr resynthesis

Question 5

How can creatine supplementation useful in helping aid PCr depletion?

Answer 5

Increases the actual rate of PCr resynthesis between high-intensity bouts

Question 6

How many days of creatine loading is sufficient to increasing resting skeletal muscle creatine concentration?

Answer 6

5 days
20g of creatine

Question 7

What does CHO ingestion prior to exercise increase?

Answer 7

Plasma Insulin
Glucose
CHO oxidation

Question 8

What does CHO ingestion prior to exercise supress?

Answer 8

Plasma Glycerol
FFAs
Lipid Oxidation

Question 9

What does consumption of sports drinks do?

Answer 9

Maintain/elevate glucose levels
Improve intermittent shuttle running capacity
Maintain high rate of CHO oxidation

Question 10

What are the 2 main sources of ATP hydrolysis?

Answer 10

Cross-bridge cycling
SR Ca2+ Uptake

Question 11

What is fatigue?

Answer 11

Exercise induced decrease in the ability to produce force