Fatigue

Question 1

Fatigue Definition

Answer 1

subjective feeling of tiredness, develops from the start of exercise and continues until exhaustion

Question 2

Exhaustion Definition

Answer 2

The point at which fatigue leads to the termination of exercise

Question 3

Task Failure Definition

Answer 3

Being unable to complete the given task e.g. cycling at 80% VO2max

Question 4

Describe what happens to PO during the 3- min all-out test

Answer 4

starts at high PO, drops very quickly due to fatigue. Levels off and can be maintained at lower PO for longer periods of time

Question 5

Simple mechanisms attributed to fatigue

Answer 5

Metabolite accumulation, substrate depletion and psychophysical sensation of effort

Question 6

Task disengagement definition

Answer 6

Mentally deciding to stop a task before physical exhaustion occurs

Question 7

Working definitions of fatigue

Answer 7

1. Exercise-induced reduction in MVF from a muscle/group of muscles, regardless of whether task can be sustained
2. (preffered) a condition in which there is a loss of force/velocity developing capacity from a muscle under a load, which is reversible by rest

Question 8

Causes of Central Fatigue

Answer 8

supraspinal/spinal fatigue
central activation - excitability of motor cortex
reduced neural drive effecting muscle contractions
muscle afferent feedback

Question 9

Causes of Peripheral Fatigue

Answer 9

Excitation contraction coupling reduced
impaired calcium release and uptake
metabolite accumulation
substrate depletion
membrane excitability impairments

Question 10

How to measure peripheral fatigue

Answer 10

Interpolated twitch technique - the extent to which the potentiated twitch decreases describes increases in peripheral fatigue.

Question 11

How to measure central fatigue

Answer 11

Interpolated twitch technique - A larger superimposed twitch trace and force suggests greater central fatigue development.

Question 12

Goodall (2017) findings & limitation using ITT throughout a football match

Answer 12

Global fatigue decreases progressively throughout the match.

Peripheral fatigue decreased up to a point and then began to plateau.

Central Fatigue continually decreased throughout.

A limitation: time taken to set up the rig allows fatigue to be regulated by the body, making readings less accurate