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Flashcards in Quiz 2 Deck (23)
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1

Current density:

If one electrode of a stimulating pair is physically smaller than the other, it will have a higher density of current under it

2

Voluntary contraction uses what kind of fibers first?

Type I : slow twitch (oxidative, low force, resist fatigue)

3

Stimulated contraction uses what kind of fibers first?

Type II (glycolytic, high force, fatigue quickly)

4

Electrical stimulation contraction what muscle fibers first and why?

fast twitch Type II: large diameter motor neuron

5

Voluntary muscle contraction is :

smooth onset
asynchronous recruitment of motor units

6

Stimulated contraction:

rapid (can be jerky) onset
synchronous recruitment of motor units

7

Pulse duration for small muscles:

150-200 us

8

Pulse duration for large muscles

200-350 us

9

Pulse frequency for twitch:

less than 20 pps

10

Pulse frequency for tetany:

35-50 pps

11

Pulse frequency for fatigue:

greater than 50 pps

12

Pulse frequency for strengthening:

up yo 80 pps

13

On: off time for building strength

6-10 sec ON time
on: off ration 1:5, 1:4 or 1:3

14

On: off time for fatiguing spasm

2-5 sec ON time
ON; OFF ratio 1:1

15

On: off time for edema reduction:

2-5 sec On time
on: off ratio 1:1

16

Ramp time for strength building contractions:

2-4 sec (longer ramp)

17

Ramp time for weaker contractions:

1-2 sec

18

What situations may require no ramp?

active dorsiflexion assist during gait

19

What situations may require extended ramp?

antagonist to spastic muscle

20

Treatment time for muscle strengthening:

10-20 contractions

21

Treatment time for muscle reeducation:

depends on activity

22

Treatment time for muscle spasm reduction:

10-30 mins

23

Treatment time for edema reduction (muscle pump)

30 mins