Neuromuscular Physiology IV Flashcards
1
Q
What does the SAID principle stand for?
A
S - specific
A - adaptations to
I - impose
D - demands
2
Q
When does fatigue process begin?
A
well-before “fatigue failure” occurs
3
Q
Factors affecting fatiguability
A
- F-V and P-V relationships
- fibre-type distribution
- training
4
Q
What does muscle force & power depend on?
A
- # cycling cross-bridges
- force per cross-bridge
- rate of activation and deactivation of cross-bridge cycling
- rate of cross-bridge cycling
5
Q
Neural mechanisms of fatigue
A
- decreased activation from higher centers
- altered reflex inputs to motorneurons
- decreased motorneuron excitability
- failed neuromuscular transmission
6
Q
Muscle mechanisms of fatigue
A
- impaired Excitation-contraction coupling
- metabolic factors
7
Q
In aging, decrease/loss of what muscle fiber type?
A
Type II fiber size and #
8
Q
Resistance training adaptations
A
- repeated activation of MU’s, specific to muscle fibers activated
- amount of activation dictates the level of ‘support’ systems needed to maintain homeostasis
- progressive overloading of musculoskeletal system is stimulus needed for adaptations
- protocols for resistance training are infinite, may have similar adaptations
9
Q
Adaptations to training: muscular adaptations
A
- muscle hypertrophy occurs due to increased muscle fiber CSA
- fiber hypertrophy
10
Q
Fiber type transitions from muscular adaptations to training
A
increased % type IIa, decreased % type IIx
(may decrease % hybrid fibers)
11
Q
Capillary density and strength training
A
- with high levels of muscle fiber hypertrophy, decreased capillary density
12
Q
interactions in neuromuscular adaptations
A
- greater increase in strength than in muscle size suggests neural adaptations predominate in early training
- later in program: neural adaptations may plateau, increases in strength & power dictated by muscle adaptations
13
Q
A
