Muscle Strength And Power 2 Flashcards
1
Q
What are the structural determinants on strength?
A
- mCSA, muscle filament density.
- Body size
- Muscle fibre type distribution
- Muscle length
- Muscle pennation
2
Q
What are the neural determinants of strength?
A
- Motor Unit Recruitment
- Rate Coding
- Synchronization
- Intramuscular coordination (single muscle)
- Intermuscular coordination (number of muscles)
3
Q
What is a motor unit?
A
A motor unit consists of a motor neutron and the muscle fibres it innervates.
4
Q
When is strength greatest?
A
- more MU are involved
- MU greater in size
- Rate of stimulus firing is faster
- Greater Synchronization of MU
5
Q
Explain size principle.
A
- ‘all-or-none’ law
- ST MU recruited first
- FT MU - highest recruitment threshold
6
Q
Explain muscle strength deficit (MSD)
A
- individual will be unable to recruit their maximal number of MU
- reserve MU remain untapped - hidden potential
7
Q
Explain rate coding
A
Discharge frequency of motor neurons.
- small muscles recruited at 50% max force
- large muscles recruited for 80%+ max force
8
Q
Explain Synchronization
A
- MU usually activated asynchronously and in series to enable smooth movement
- Evidence suggests elite strength and power athletes can synchronously activate multiple MU
9
Q
What is the SAID principle?
A
Specific adaptation to imposed demands
