Module 6 Flashcards
The force- velocity relationship describes what?
muscular force under different velocities including concentric, isometric, and eccentric contractions
Force in the muscle is higher in isometric, concentric, or eccentric contractions?
What about absolute force
eccentric
absolute force is relatively unchanging
Exercises at a high positive velocity imply that muscles are contracting with ____ force.
Low
because as velocity increases, muscle force decreases.
What adaptations may you see in response to high velocity vs low velocity training?
high - CNS activation
low - muscle strength building
How could knowledge of the force velocity curve be applied to individuals who have trouble producing force with their muscles and why?
what is a drawback to this
individuals that can’t produce as much force can try eccentric exercise because it is less metabolically demanding; they can create more force in the muscle eccentrically than they could concentrically or isometrically.
DOMS is a drawback
Explain the physiology of why higher velocities lead to lower active force production
actin and myosin take time to bind and detach.
the faster the filament slide past each other, the fewer cross bridges are attached at a time.
What changes to the force-velocity curve can you see with different types of training
force curve not change shape, rather shifts upwards or rightwards…
With strength training you can increase muscle force (P0) at lower velocities
with speed training, you can increase muscle force at higher velocities
Shorter fibres can produce ____ tension and _____ velocity relative to longer fibres.
what do they look like at x and y intercept
^think about how to graph that
same, less
graph look like:
- joined at y intercept
- differ at x intercept
Fibres with greater PCSA have ___ tension and ____ velocity.
Think about how graph x and y intercept?
increased, same
- x intercept is same for both
- y intercept differ
what other factor effects contraction speed of a fibre.
Explain
Muscle fibre type. Fast Fatiguable or fast glycolytic contract faster than slow oxidative with the same number of sarcomeres in series.
what relationship do you need to know for more realistic representation of how muscles function in body?
force-length-velocity relationship.
Describe how experiments are set up to test the force velocity relationship
- muscle is taken out of body
- held by two ends with one end fixed and a clamp on other end with a constant load behind the clamp.
- then electrocuted to contract fully and at some point, clamp is released.
- once released observations in force and velocity can be made.
strength training cause muscles to become slower (hypertrophy SO fibres) so why recommend to sprinter?
because inc strength allows you to raise your force velocity relationship (put out more force at greater velocities) therefore still helping print performance.
power = force * velocity therefore inc force = inc power
- inc pcsa
