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Principle of Accommodation
Both motor and sensory accommodation may easily occur when electrical stimulation is applied at a constant
frequency. The LSI System II Interferential unit allows the clinician the opportunity to lessen accommodation
by the use of the SWEEP mode. In the Premodulated mode (PREMOD light on) the burst frequency will
“sweep” within the preselected range (i.e. 3 to 5 Hz, 80 to 120 Hz or 1 to 150 Hz). If the operator selects a
specic frequency, 70 Hz as an example, the sweep will be 20% plus and minus from the 70 Hz.
In the Frequency Difference interferential mode (PREMOD light off), channel 2 will sweep between the
preselected range (i.e. 4003 to 4005 Hz, 4001 to 4015 Hz, 4080 to 4120 Hz or 4001 to 4150 Hz).
Use of the Vector
With the amplitude of both channels set at the same milliamps of current, the interference or beat frequen-
cy current will be positioned between the ow of current created by each channel. This is referred to as a
static or stationary position. The interference current will be drawn nearer to the stronger current output
of either channel 1 or channel 2. In order to move or rotate the interference current within the tissue, the
VECTOR mode is utilized. The VECTOR mode automatically changes the intensity of channel 1 and 2,
alternately, from their preset output. Each channel will alternately drop 20% in output and then return to
the preset output. This effect pulls the interference or beat frequency current back and forth to effectively
provide coverage of all tissue within the four electrode eld.
Muscle Stimulation
Medium frequency current, pre-modualted in the range of 40 to 60 Hz, produces smooth, comfortable,
asynchronous contraction in normal innervated muscle. Such contractions have been utilized for edema
reduction, muscle spasm reduction and muscle strengthening (also referred to as Russian Stimulation).
Edema Reduction
By utilizing the 10/10 mode (10 seconds of contraction alternating with 10 seconds of rest), with the cur-
rent intensity set to produce gentle movement of the involved joint, the body’s natural muscle pumping
action is simulated.
Muscle Spasm Reduction
By also utilizing the 10/10 mode, with the current intensity set to produce strong contractions of the involved
muscle, the muscle will fatigue over a period of minutes due to the short rest time and depleting of ATP.
Muscle Strengthening
In this procedure, the 10/50 mode is used to provide 10 seconds of contraction followed by 50 seconds of rest.
Ramping
The LSI System II Interferential has a built in ramping effect when the 10/10 or 10/50 modes are in use. As
the 10 second cycle begins, the current will slowly “ramp up” over a period of 2.5 seconds to the preset inten-
sity. As the 10 second on cycle ends, the current will “ramp down” over a 2 second period. This allows for a
gentle onset and completion of contraction cycle.
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