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Domains of Exercise Flashcards

(13 cards)

1
Q

What does critical power represent?

A

The highest power output that can be maintained over time, without drawing on W’ (i.e., rate of oxidative ATP production).

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2
Q

At which points, studied in this module can critical power be found at?

A

Between lactate threshold and VO2max.
Relates to MLSS.

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3
Q

Is it possible to increase our critical power? If so, how?

A

Yes.

Short-term continuous endurance training.
High-intensity interval training.

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4
Q

In what environment will our critical power decrease?

A

Hypoxic (acidic)

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5
Q

State the definition of W’ and a description of what that means.

A

Fixed energy store representing anaerobic capacity.

This store represents the initial ATP store, followed by PCr breakdown, anaerobic glycolysis, and the production of lactate.

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6
Q

What two equations can be used to calculate W’?

A

W’ = Power above CP * duration
W’ = Power * time

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7
Q

What increases our W’ store?

A

Short-term interval sprint training
Heavy intensity exercise
(Little research) Intake of dietary creatine

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8
Q

What decreases our W’ store?

A

Previous high intensity exercise, greater than CP, which used stores of our W’.
Glycogen depletion.

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9
Q

Describe what happens to blood lactate and VO2 when we exercise at CP + 5%.

A

Blood lactate increases systematically until athlete is no longer able to continue exercising. This is likely due to accumulation of H+.

VO2 graph demonstrates a pronounced slow component with a increase until VO2max plateau has been reached.

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10
Q

What are the three domains of exercise?

A

Low, Moderate, and Severe

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11
Q

At which domain of exercise is steady state never attainable?

A

Severe

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12
Q

Prior to phase I of breathing, why can’t we see a straight line at the beginning of the oxygen uptake kinetics graph?

A

Slight fluctuations in breath cause the graph line to reach small peaks and troughs.

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13
Q

Describe the slow component of the oxygen uptake kinetics graph.

A

There is a slow rise in VO2 at high power outputs due to the recruitment of type II muscle fibres.
Type II muscle fibres fatigue quicker, using O2 less efficiently, producing more H+ than type I fibres.
As VO2 rises, as does H+ concentration.
The athlete will either reach their VO2max or will have to cease exercise due to exhaustion of anaerobic stores (W’).

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