Electric Stim - Muscle contract Flashcards

0
Q

ac will cause blank of motor unit

A

depolarization

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

muscle contraction steps

A
  1. depolarization of alpha motor neuron
  2. synapse with nmj
  3. ach released into synaptic cleft
  4. muscle contract
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

dc will cause depolarization of blank

A

muscle cell directly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

if a nerve has been severed, this current should be used to stim muscle contraction

A

direct

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

alpha motor neuron and beta sensory neurons are stimulated by blank

A

russian current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

russian current stimulates blank motor units

A

large

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

to excite a tissue, stimulate must be long enough, strong enough and rise quickly enough… what law?

A

arndt shultz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

high frequency will cause blank

A

tetanic contraction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

to increase strength in healthy subjects, the mvc must be at least blank percent of MVC

A

50%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

increase strength in injured muscle requires blank percent of mvc

A

10%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

if someone is mmt grade 2 but the current creates a grade 3 then blank occurs

A

strengthening

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

pulse duration is blank for larger muscles

A

longer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

carrier frequncy of russian current

A

2500 pps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

one electrode over target with other electrode placed some distance away over nonexcitable tissue

A

monopolar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

10:10:50

A

contractions:on:off

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

both channels activated at same time

A

synchronous

16
Q

both channels are activated alternately

A

reciprocal

17
Q

there is more fatigue with blank than blank

A

e stim, voluntary contraction

18
Q

four things that influence force frequency relation

A

muscle length, temp, fatigue state, degree of potentiation of muscle

19
Q

low frequencies(1-2pps) cause blank

A

twitches

20
Q

higher frequencies (15pps) cause blank

A

summation

21
Q

frequencies > 30 pps causes blank

A

fused tetanus

22
Q

temporal motor unit recruitment in e stim is blank

A

synchronous

23
Q

temporal motor unit recruitment in voluntary is blank

A

asynchronous

24
Q

both electrodes placed over target tissue

A

bipolar

25
Q

four electrodes over target tissue

A

quadripolar