fatigue and recovery Flashcards
1
Q
what is fatigue?
A
- loss of capacity for developing force and/or velocity of a muscle.
2
Q
what are the possible sites of fatigue? and where do they occur?
A
- central nervous system. (brain, spinal cord, neuron)
- peripheral nervous system (alpha motor neuron)
- skeletal muscle fibers. (happens w/I muscle fibres)
3
Q
how does dopamine and serotonin affect the body?
A
dopamine is a hormone in which our motivation and rewards occur.
serotonin is a hormone in which our body goes into a relaxed/tired state.
4
Q
when are Slow oxidative fibers used? type 1
A
- during long endurance activity, that requires lots of energy.
- normally 3+ minutes
- main fuel source is glucose/ glycogen
- when ATP is relied on.
- also where CNS fatigue occurs.
- less mitochondria
5
Q
when do we use fast oxidative glycolytic (FOG) fibers? type 2a
A
- these are our intermediate fibers.
- used during moderate intensity.
- used during aerobic and anaerobic respiration
- 1-3 minute during intermediate exercise.
- moderate mitochondria
- these fibers can be trained to behave like type 1 or type 2b.
6
Q
when do we use fast glycolytic fibers? type 2b
A
- these fibers are used more for power than endurance.
- they are not fatigue resistance.
- we use them during anaerobic activity primarily.
- they have less mitochondria, and myoglobin (O2 blood)
7
Q
durning CNS fatigue what are proposed mechanisms that would be affected?
A
- malfunction of neurons
- inhibition of voluntary motor cortex
- psychological factors
8
Q
In the PNS where are 3 places where site of fatigue can occur? and what are the proposed mechanisms affected?
A
- NMJ
- inhibition of axon terminal
- depleted neurotransmitters - T tubules/SR
- inability to release Ca2+
- inability of Ca2+ to bind to troponin bc tropomyosin has not been removed. - contractile elements
- depletion of ATP, PC, glycogen
- accumulation of lactate, H+, PO4-, Pi.
9
Q
what is ATP/PCr depletion?
A
