Lecture 8 - Acute adaptations from strength exercises Flashcards
1
Q
What can the variance be in output of explosive power depending on the changes In warm up routines?
A
- 5 - 10% difference in explosive performance
2
Q
What is the thermic effect of warm up routines?
A
- For every 1°c increase in temperature there is a 1% improvement in performance, However above 37°c is negative for performance.
3
Q
What is the mechanism associated with PAP?
A
- An increased sensitisation to the phosphorylation process on the myosin light chains (Szczesnaet al., 2002)
- Increased alpha motor neuron recruitment and a reduced reciprocal co-contraction (Jeffreys, 2008)
- A decreased angle of pennation
4
Q
What is the process of neural recruitment and inhibition of the co-contraction of Renshaw cell?
A
- First contraction–activates large motor units
- Reduced inhibition by the Renshaw cell
- Second contraction recruits more larger motor units
- Different muscle action
5
Q
What is twitch potentiation?
A
- If a muscle is stimulated electronically this inhibits the Renshaw cell allowing for a greater strength outcome by the muscle.
6
Q
What is the effects of an increased sensitisation to the phosphorylation process on the myosin light chains?
A
- This allows the Spare myosin heads to come into contact with actin filament , resulting in a greater level of contraction.
7
Q
What depth of squat results in the highest levels of potentiation, and what knee angle was is this at?
A
- A half squat at 90 degree knee angle.
8
Q
To what ratio/ percentage does a 1rm back squat correlate to for PAP?
A
- Needs to be 1.6 percent of back squat to be correlated with potentiation.
-E.g BW - 80
1RM = 150
above the 1.6 or 128kg level for potentiation.
9
Q
What factors effect muscle and strength power associated with PAP?
A
- Fibre type
- CSA
- Pennation
- Moment arm
- Force velocity, both concentric and isometric, not eccentric.
