SSC Flashcards
1
Q
What is SSC?
A
- stretch of SEC and CB during forced or controlled lengthening of contracted muscle
- SEC = series elastic component (connective tissue)
- CB = active cross-bridges
2
Q
What is relaxed muscle stretch?
A
- forced lengthening of relaxed skeletal muscle
- SEC stretch, no active cross-bridges
3
Q
SSC potentiation
A
- enhancement of muscle force output by some other factors
- eccentric preceding concentric contraction
4
Q
Mechanisms of SSC potentiation
A
- High initial force level
- Taking up the SEC
- Storage of elastic energy
- elastic energy stored during eccentric, released during concentric
- Activated cross-bridges
- Reflex potentiation
5
Q
Velocity & SSC
A
- Velocity of ECC affects SSC potentiaion even if CON velocity doesn’t change
6
Q
What caused decrease in potentiation?
A
reduction in jump height off highest block may be due to too much momentum, also causes inhibition
7
Q
Effects of training on SSC
A
Increased eccentric strength (force)
- increased muscle hypertrophy & neuromuscular activation
Increased storage of elastic energy
Maybe increased reflex potentiation?
- increased neural activation
8
Q
Wilson et al
1991
A
Force Output was greater with SSC/Eccentric
Due to:
Heightened cross-bridge cycling during the Eccentric
Lengthening of the muscle group
9
Q
Kubo et al
2001
A
Tendon stretch = Good for Force production
Tendons still lengthen since the muscle has to partially contract
