INTERFERENTIAL AND PREMODULATED MODALITY INFORMATION
DYNATRON® 25 SERIES™ | OPERATOR’S MANUAL 29
Interferential and Premodulated
Modality Information
Interferential (Quadpolar) Therapy
Interferential therapy uses four electrodes to deliver two currents, one current with a constant frequency of 4000 Hz and the
other current with a variable frequency of 4000 to 4150 Hz. e paths of these two currents cross resulting in a “beat” that
produces the therapeutic frequency at the treatment site.
e resulting frequency is between 1 and 150 Hz. An example of wave forms representing these currents is illustrated here.
In the Interferential mode, two output jacks (Channels 1 and 2, or 3 and 4) are utilized with four electrodes placed in a
crisscross fashion, “bracketing” the treatment site. e output from Channel 1 (or Channel 3) is the constant 4000 Hz wave,
while the output of Channel 2 (or Channel 4) is the variable 4000 to 4150 sine wave.
e “beat” phenomenon. Two waves of dierent frequencies over 4000
Hz, combine to produce a beat which is between 1 and 150 Hz.
Stimulation produced by 4 electrodes.
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