Lecture 14 : RFD, What is it and How do we use it Flashcards
(57 cards)
power is the relationship between
the amount of force that we produce and the velocity we can produce it
in terms of force and velocity relationship is power linear or non linear
non linear
a power athlete is an athlete that has a
high rate of force development
what is rate of force development
the speed at which muscle force can be generated
motor unit discharge rate refers to
the frequency or the action potential spikes that are sent to the motor unit
motor discharge rate is somewhat to related to
descending drive of the muscle and the type of muscle fibres we are activating
recruitment rate / interval is the
time delay between the activation of successive motor units
does a higher discharge rate mean we get a higher recruitment rate
no it does not
the muscle tendon unit consists of what components
contractile element
series elastic component
parallel elastic component
what is the contractile element of MTU
the muscle fibres that actively generate force through cross bridge cycling
what is the series elastic component of the MTU
the tendon, which stores and returns elastic energy
what is the parallel elastic component of the MTU
passive structures (like fascia, connective tissue) surrounding the muscle
the MTU behaves like a what system,…… where force and length changes depending on ….
the MTU behaves like a mechanical system, where force and length changes depending on the dynamic interaction between the active contractile elements and elastic components
how is the elastic component described and what does this mean for force development
like a spring
non active
can only develop tension through passive means such as being stressed or stretched
how does the muscle fibre and and tendon opperate when coupled
the muscle fibres and tendons lengthen or shorten together
when is the muscle and tendon usually seen to be coupled
seen mostly during slow controlled movements (often in eccentric work)
when the muscle and tendon are coupled which takes on more of the load
muscle fibres take on more of the length change load
performing a coupled movement (muscle and tendon) means what for time under tension
performing a movement coupled will give the tendon more time under tension
decoupling is seen in what activities
most activities we do
most common way for the muscle tendon unit to behave
how do tendon and muscle behave in a decoupled movement
behave independently
tendon may stretch or recoil, while muscle fibres remain isometric or shorten at different rates
decoupling is most common in what movements
explosive movements (sprinting, jumping etc)
decoupling movements allow tendons to ….. and what to muscles
allows tendons to buffer rapid length changes
protect muscle fibres and store energy
decoupling is what enables …. in rapid or stretch shortening cycle activities
force potentiation and mechanical efficiency
if we wanted to enhance force output to jump or sprint we have to think about the (tendon)
compliance of the tendon, how elastic or reactive is it to loading
