Lecture 4

Question 1

Critical power (CP) in physiological terms

Answer 1

Physiological: Highest work rate that can be sustained for a long time
-No anaerobic system help

Question 2

W’ explained

Answer 2

Total work that can be done above CP
-The higher the power output above CP, the quicker W’ is used up

Question 3

Where is critical power found on the power-time graph?

Answer 3

It is the asymptote of the power-time graph

Question 4

What is the highest intensity where exercise metabolism can achieve a steady state?

Answer 4

Critical power

Question 5

True or False: W’ is the anaerobic energy capacity

Answer 5

True!

Question 6

Is W’ reduced by hypoxia?

Answer 6

No, as under hypoxic conditions, CP is also reduced. The overall W’ is the same as it would be under normoxic conditions where CP is higher

Question 7

Why is W’ reduced by prior high intensity exercise?

Answer 7

Reduced levels of glycogen and PCr leads to an overall reduction of anaerobic capacity

Question 8

How do increased Pi levels and decreased pH affect muscle fatigue?

Answer 8

Increased Pi levels and decreased pH increase muscle fatigue

Question 9

How long can exercise at CP be sustained?

Answer 9

At least 30 minutes
-Not indefinitely due to accumulation of metabolites, glycogen depletion, motivation, pain, etc.