Compex mi-Sport - Manual (Page 94)

Neurostimulation
A ll electrical specifications are given for
a charge between 500 and 1000 ohms
per channel.
Channels: Four independent and individually
adjustable channels electrically insulated from each
other and from ground
Impulse shape: Constant rectangular current
compensated to eliminate any direct current
component to avoid any residual skin polarisation
Maximum current of an impulse:
120 milliamperes
Intensity increase interval:
Manual stimulation intensity adjustment: 0-999
(energy units)
Minimum interval: 0.5 mA
Impulse duration: from 60 to 400 microseconds
Maximum quantity of electricity per impulse:
96 microcoulombs (2 x 48 µC compensated)
Typical rise time for an impulse: 3 microseconds
(between 20% and 80% of maximum current)
Impulse frequency: from 1 to 150 Hertz
T he principle of electrostimulation is
to stimulate nerve fibres by means of
electrical impulses transmitted by
electrodes.
T he electrical impulses generated by
Compex stimulators are high-quality
impulses – ensuring safety, comfort
and efficiency – that stimulate different
types of nerve fibres:
1. the motor nerves to stimulate a muscular
response. The quantity of work and the benefits
obtained depend on the stimulation parameters.
This is known as electromuscularstimulation (EMS).
2. certain types of sensitive nerve fibres to obtain
analgesic or pain-relieving effects
III. HOW DOES ELECTROSTIMULATION WORK ?
1. Motor nerve stimulation
(EMS)
I n voluntary activity, the order for
muscular work comes from the brain,
which sends a command to the nerve
fibres in the form of an electrical signal.
This signal is then transmitted to the
muscular fibres, which contract.
T he principle of electrostimulation
accurately reproduces the process
observed during a voluntary contrac-
tion. The stimulator sends an electrical
current impulse to the nerve fibres,
exciting them. This excitation is then
transmitted to the muscular fibres
causing a basic mechanical response
(= muscular twitch). The latter consti-
tutes the basic requirement for
muscular contraction.
T his muscular response is completely
identical to muscular work controlled
by the brain. In other words, the
muscle cannot distinguish whether
the command comes from the brain
or from the stimulator.
T he parameters of the Compex
programs (number of impulses per 94
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Manuel MI-SPORT:MI-SPORT-ME 0909 10/09/09 19:19 Page 94