11
With Frequency Difference interferential, the uninterrupted frequency output from channel 1 and 2 will
create Widensky Inhibition (nerve block) between the corresponding electrodes. This is due to the fact that
the large diameter sensory bers will tend to depolarize at this higher constant frequency and block nerve
conduction completely. The “beat frequency” therefore, becomes the frequency the clinician utilizes for a
therapeutic result.
Premodulated Method
With the premodulated method, both output channels produce the identical carrier frequency of 4000Hz.
However, the modulation or bursting occurs within the unit and is delivered to the tissue in a burst
frequency as selected by the clinician. Since both channels are synchronized and always in phase, the beat
frequency will be the same as the pre-modulated frequency.
With Frequency Difference interferential, the uninterrupted frequency output from channel 1 and 2 will
create Widensky Inhibition (nerve block) between the corresponding electrodes. This is due to the fact
that the large diameter sensory fibers will tend to depolarize at this higher constant frequency and block
nerve conduction completely. The “beat frequency” therefore, becomes the frequency the clinician utilizes for a
therapeutic result.
With the premodulated method, both output channels produce the identical carrier frequency of 4000Hz.
However, the modulation or bursting occurs within the unit and is delivered to the tissue in a burst
frequncy as selected by the clinician. Since both channels are synchronized and always in phase, the beat
frequency will be the same as the pre-modulated frequency.
Channel 1
4000Hz
Channel 2
4000Hz
Beat Frequency
4000Hz
Channel 1
4000Hz
Channel 2
Beat Frequency
4
Premodulated Method
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