Electrotherapeutic Basics Flashcards Preview

Phys Agents > Electrotherapeutic Basics > Flashcards

Flashcards in Electrotherapeutic Basics Deck (154)
Loading flashcards...
121

What is a twin peak monophasic pulse

Pair of monophasic spike like waveforms with an almost instantaneous rise followed by exponential decline

122

What is the pulse duration of HVPC

Short from 100-200 usec

123

True or False:
HVPC are generally fixed by the manufacturer

True

124

True or False:
Some HVPC allow for adjustment of interspike interval

True

125

What is the pulse frequency of HVPC

1-200 pps

126

What does capacitance equal

Charge/voltage

127

Do high voltage sources have more or less capacitance

Less

128

Do low capacitance sources have high or low tissue impedance

Low tissue impedance

129

Are low tissue impedances more or less comfortable

More comfortable

130

True or False:
For HVPC there is a need for high voltage output due to extreme shortness of pulse duration at it peak in keeping with classic strength duration curve

True

131

If your pulse duration is short what is your current amplitude for HVPC

Higher current amplitude

132

What does the versatility or high voltage output and monophasic pulsed waveform allow for (2)

1. Electric nerve/muscle stimulation
2. Wound healing

133

Who created Russian Current

Yakov Kots in 1977

134

How does Russian Current effect human muscle contraction

It can generate up to 30% more force then that generated by a MVC

135

Is the application of Russian Current painful or painless

Painless

136

Russian Current can cause what to happen in short term training

Produce lasting gains in muscle strength of up to 40% in healthy subjects

137

When was the first Russian Current stimulator produced in the US

1980

138

What is the clinical importance of Russian Current

You possibly train individuals without the need of voluntary contractions

139

True or False:
Russian Current is a time modification of continuous sinewave having carrier frequency of 2500 pps

True

140

How long is Russian Current burst modulated fixed for

10 msec periods

141

What is the fixed interpulse interval (IPI) for Russian Current

10 msec

142

What is the burst frequency of Russian Current

50 bursts per second (bps)

143

What is the carrier frequency of Russian Current

2500 pps

144

What is the burst duration of Russian Current

10 msec

145

What is the interpulse interval of Russian Current

10 msec

146

What determines the magnitude of effect

The total # of bursts/sec

147

What is each burst at the nerve muscle membrane treated as

A single pulse

148

What does repeated delivery of these bursts during Russian current lead to

Motor nerve depolarization and tetanic contraction

149

What are the physiologic effects of Russian Current (3)

1. Depolarize both motor and sensory neurons simultaneously
2. Muscle contraction will be painless
3. Higher current amplitudes can be used

150

What will higher current amplitudes stimulate

Deeper motor neurons