Electric Stim - Muscle contract Flashcards
ac will cause blank of motor unit
depolarization
muscle contraction steps
- depolarization of alpha motor neuron
- synapse with nmj
- ach released into synaptic cleft
- muscle contract
dc will cause depolarization of blank
muscle cell directly
if a nerve has been severed, this current should be used to stim muscle contraction
direct
alpha motor neuron and beta sensory neurons are stimulated by blank
russian current
russian current stimulates blank motor units
large
to excite a tissue, stimulate must be long enough, strong enough and rise quickly enough… what law?
arndt shultz
high frequency will cause blank
tetanic contraction
to increase strength in healthy subjects, the mvc must be at least blank percent of MVC
50%
increase strength in injured muscle requires blank percent of mvc
10%
if someone is mmt grade 2 but the current creates a grade 3 then blank occurs
strengthening
pulse duration is blank for larger muscles
longer
carrier frequncy of russian current
2500 pps
one electrode over target with other electrode placed some distance away over nonexcitable tissue
monopolar
10:10:50
contractions:on:off
both channels activated at same time
synchronous
both channels are activated alternately
reciprocal
there is more fatigue with blank than blank
e stim, voluntary contraction
four things that influence force frequency relation
muscle length, temp, fatigue state, degree of potentiation of muscle
low frequencies(1-2pps) cause blank
twitches
higher frequencies (15pps) cause blank
summation
frequencies > 30 pps causes blank
fused tetanus
temporal motor unit recruitment in e stim is blank
synchronous
temporal motor unit recruitment in voluntary is blank
asynchronous
both electrodes placed over target tissue
bipolar
four electrodes over target tissue
quadripolar
