Muscle Actions - Class 4 Flashcards
muscle actions
isometric
concentric
eccentric
isokinetic
isometric
force is developed w/o any motion about an axis
no work is performed
isometric is used to train
postural muscles
when can isometric be used
joint motion is contraindicated
immobilization
weakness at a specific point in ROM
2 types/cuing –> isometrics
push or overcoming
hold or yielding
dynamic exercise
dynamic muscle contraction
causes joint movement and excursion of a body segment
–> as the muscle shortens or lengthens under tension
muscle shortening
concentric
muscle lengthening
eccentric
force - velocity relationship –> higher expected force during
slow concentrics
fast eccentrics
we can…–> force - velocity relationship
modify speed of an exercise to further increase strength
how can resistance be applied during concentric and eccentric exercise
constant
variable
isokinetic
constant external resistance
limb moves through ROM against a constant load
variable resistance
provides varying levels or resistance to load muscles at multiple points through the ROM
what does variable resistance include
elastic bands/tubes
manual resistance
during variable resistance there is
mismatch b/w length tension relationship and band tension
what may variable resistance may limit
excursion
through available ROM
benefits of variable resistance
transportable
easy to set up and use
cheap
isokinetic resistance
concentric or eccentric muscle contraction
constant velocity is maintained throughout the muscle action
during isokinetic resistance
velocity is pre-determined
special equipment is used
what does isokinetic resistance allow for
maximal resistance throughout the entire ROM
