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English
Further Notes on the Modulation of the Impulse
The continuous stimulation with higher frequencies hinders the repolarisation on the
cell membranes and leads to the depletion of the neurotransmitter reservoirs on the
neuromuscular end-plate (Illustration 1).In order to maintain a stimulation effect, the
stimulation must be modulated in respect of the frequency or the intensity (that is,
the amplitude). The AmpliMove medical operates with amplitude modulation.
Traditionally, this has applied in the Nemec’s interference current whereby two
current circuits with differing frequencies are superimposed in the body. A frequency
difference results from the interference of the impulses. The application of 4000
Hz (first current circuit) and 3900 Hz (second current circuit) theoretically leads to a
stimulation of 100 Hz. But in practice and on account of the complex electro-physical
conditions in the human body, the stimulations results are difficult to predict.
However, with the AmpliMove medical the modulations occur within the device
so in contrast to interferential current, therapy can proceed with only one channel.
The medium frequency alternating current serves as a carrier from two possible
modulations which are independent of each other:
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A low frequency modulation with a frequency range of 1 - 100 Hz (Illustration2). The
effect of these frequencies differs in respect to those generated by TENS without the
medium frequency carrier wave. But general experience gained from low frequency
effects can be transferred in respect of their analgetic and muscular stimulating
effects.
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An overlapping envelope curve modulation (Illustration 3), by which in addition, the
ramp, working and pause phases are specified. This modulation prevents premature
fatigue, especially of the striated musculature.
The modulations can proceed in different degrees of 1 to 100 %, whereby a stronger
modulation level provides a more intensive stimulus. Both types of modulation can be
freely combined with each other.
Illustration 1
Unmodulated medium
frequency carrier wave
Illustration 2
Low frequency amplitude
modulation of the medium
frequency carrier wave
Illustration 3
Overlapping envelope curve
modulation