The Polarity
The medium frequency rectangular impulses of the AmpliMove medical are zero
line symmetric and trigger, on account of their short width and high frequency,
only minimal ion migration in the tissue. Treatment with the AmpliMove medical
is therefore gentle on the skin and well tolerated. A polarity and a dierential in a
cathode and an anode are omitted. Both electrodes function in the same manner. This
provides easy electrode placement.
Regarding Frequency and Intensity
A characteristic of medium frequency is the increasing distance between the motoric
and the sensitive threshold with an increase in the frequency. As a result, the motoric
threshold declines and has, at 10000 Hz, the greatest dierential to the sensitive
threshold. The motoric stimulation in this frequency range is accompanied by a
minimum of sensitive stimulation.
By contrast, a reduction in the frequency to 1000 Hz, the threshold draws increasingly
nearer. A motoric stimulation is therefore related to an increasing perception of the
electrical current. The motoric stimulation eect and the development of power are
more pronounced in the lower frequency range, with a maximum of 1000 Hz.
With regard to muscle stimulation, the frequency selection represents a compromise
between the sensitive stimulation/inconvenience and the required motoric reaction.
Many therapists often use the frequency 4000 Hz. For electrical current sensitive
patients, a higher frequency could be advisable. If an intensive stimulation is wished,
a lower frequency should be selected.
Higher frequencies can, on account of their lesser electrical current perception,
mislead to the application of enhanced current strength and an increase in the training
intensity. This can cause, during and after the stimulation, to a muscular reaction such
as fatigue and the occurrence of pain.
Current intensity which triggers a visible muscle contraction of the greater part of
the muscle is generally sucient to eect muscular stimulation. Maximum strain on
untrained or weak muscles is to be avoided and as a matter of principle, muscular
contractions should not be painful.
Pain therapy requires muscle contractions only in the lower modulation range of up
to 15 Hz. This range is appropriate in particular for the treatment of chronic pain. For
higher frequency modulations of up to 100 Hz the sensitive stimulation is decisive
for the eect. Muscular contractions are not required here and this enables longer
stimulation periods without resulting in muscular fatigue. A lower intensity is selected
accordingly. On account of the specific stimulation quality of the medium frequency
impulses, muscular reactions and their related application time limitation cannot,
however, always be avoided.