Quiz 1 Flashcards
Naturally we use small diameter type __ muscle fibers first, but with estim we recruit large diameter type __ first.
Type 1, Type 2
Which type of circuit is best for muscle since it uses less resistance?
Parallel Circuit
What frequencies are generally required for postural muscles?
13-15pps
What is the formula for a parallel circuit?
1/R*total = 1/r1 + 1/r2 + 1/r3 ….
What should patients do to recruit both type 1 and 2 fibers for best functional gains?
Use both Estim and Physiological contractions
What is the formula for Amperage?
I= V/R
Longest stimulus is for ________.
Denervated muscle: 10-35 ms
What is the formula for Voltage?
V= IR
Which frequencies are generally required for peripheral muscles?
35-50pps
What does a series circuit formula look like?
R *total = r1 + r2 + r3 ….
The speed at which an AP travels depends on what?
- The diameter of the nerve (The greater the diameter of the nerve, the faster the AP will travel)
- Nerve is myelinated or not (Myelinated nerves cause after action potentials than non myelinated)
What is the formula for Resistance?
R=V/I
Shorter durations of stimulus will stimulate _______.
Sensory Recptors (Sharp Pain) <80 microsecond
When stimulating innervated tissue, how long should the pulse duration be set?
< 1 ms to minimize pain
In a mechanical stimulator, what are the parts that convert electricity to a variety of waveforms and an output charge of a controlled amplitude (strength)?
- Power source
- Waveform generation + timing control
- Output amplifier
