W4 - Critical Power Flashcards
What is meant by critical power
Mathematical construct based on the relationship between power output & TTE.
What is critical power also known as
Power-time relationship
Power-duration relationship
What is it called where the plateau occurs in the hyperbolic relationship between power output + time to fatigue?
Asymptote
What is known as the critical power in the hyperbolic power-time graph model?
Where it crosses the y-axis
What is critical power a critical threshold for?
Metabolic control
What was the best predictor of marathon time?
(Florence & Weir, 1997).
Critical velocity
r^2 = 0.76
What is the W’/D’
DFinite work capacity above critical power
OR
Fixed amount of work that can be performed from predominantly anaerobic processes
What is the W’ historically called?
Anaerobic work capacity
What does W’ have important consideration for?
Pacing/exercise tolerance
How can you calculate CP/CS + W’/D’?
Using athletes pbs
What do work rates above CP/CS preferentially recruit (muscle fibre wise)?
Low oxidative (fast twitch)
How is blood flow to fast twitch fibre types controlled?
By neuronal nitric oxide synthase derived NO.
W’ équation
T = W’ / (P - CP)
Time
Work prime
Power
Critical power
What is the rule for critical power when W’ is completely depleted, so is =0.
P = CP
How can you deplete W’?
3 min all-out test
What does the all-out test provide a VALID & RELIABLE assessment of?
CP
W’
VO2 max.
How do you calculate the max sustainable time for a given power output?
T = W’ / (P-CP)
or
T = D’ / (Speed - CS)
Calculation to solve the shortest time to complete a set distance
T = (Distance - D’) / CS
LT is 11.2km/h + maximal aerobic speed is 17.4km/h. Predict Critical Speed.
Maximal aerobic speed is equal to VO2 max on graph.
Critical Speed is 50% between LT + maximal aerobic speed.
= 14.3km/h
LT is 11.2km/h & maximal aerobic speed is 17.4km/h. What speed represents 40% Delta, and what intensity domain is this?
13.7km/h
Heavy domain
