Central & Peripheral Fatigue + Pacing Flashcards
1
Q
What can cause fatigue?
A
- Failure to supply O2
- Failure to regulate H+
- Failure to regulate lactate
- Glycogen depletion
- Failure to dissipate heat
2
Q
Define central fatigue and provide examples
A
Central
- Failure on CNS to adequately drive the muscle
- Disturbances to neurotransmitters
- Decrease in brain temperature
- Core and brain heat
3
Q
What is afferent feedback?
A
- Driving stimuli from muscle -> CNS. Away from muscle, a regulatory mechanism.
4
Q
What is efferent feedback?
A
CNS->muscle
5
Q
Define peripheral fatigue and provide examples
A
- An impairment located in the muscle and defined by a metabolic end point
- Substrate depletion
- Muscle metabolites
- Feedback from fatigue sensitive afferents
6
Q
What happens when exercising with existing fatigue, without and with epidurals?
A
- Reduced performance
- Same fatigue end point
- Increased central drive
- Over exertion
7
Q
What happened with fentanyl + 5k? Is there a critical limit?
A
- CNS tolerated extreme fatigue
- Different pacing strategy
- There is a critical limit
8
Q
What is a pacing strategy and what dictates it?
A
- Distribution of work rate
- Starts with feed forward
- Afferent feedback from central and peripheral sensors
- Environmental stimuli
