How Does Electrostimulation Work; Motor Nerve Stimulation (Ems) - Compex energy Manual Del Usuario

Neuro-stimulation
A
ll electrical specifications are given for
an impedance of 500-1000 ohms per
channel.
Channels: Four independent and individually
adjustable channels that are electrically isolated
from each other and earthed.
Pulse shape: Constant rectangular current with
pulse compensation to eliminate any direct
current component to prevent residual
polarisation at skin level.
III HOW DOES ELECTROSTIMULATION WORK?
he principle of electrostimulation is to
T
stimulate nerve fibres by means of
electrical impulses transmitted by
electrodes. The electrical pulses generated
by Compex stimulators are high quality
pulses - offering safety, comfort and
efficiency - which can stimulate different
types of nerve fibres:
. the motor nerves, to stimulate a
1
muscular response. The quantity and the
benefits obtained depend on the
stimulation parameters and this is known
as electro-muscular stimulation (EMS).
. certain types of sensitive nerve fibres
2
to obtain analgesic or pain-relieving
effects.
1. Motor nerve stimulation
(EMS)
n voluntary activity, the order for
I
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. The
principle of electrostimulation accurately
reproduces the process observed during a
voluntary contraction. The stimulator
sends an electrical current impulse to the
154
Maximum pulse intensity: 100 mA.
Pulse intensity increments: manual adjustment of
stimulation intensity from 0 to 694 (energy) in
minimum increments of 0.5 mA.
Pulse width: 60 to 400 µs.
Maximum electrical charge per pulse:
80 microcoulombs (2x40 µC, compensated).
Standard pulse ramp-up time: 3 µs (20%-80% of
maximum current).
nerve fibres, exciting them.
his excitation is then transmitted to the
muscular fibres causing a basic
mechanical response (= muscular twitch).
The latter constitutes the basic
requirement for muscular contraction.
This 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. The parameters of the
Compex programmes (number of
impulses per second, contraction time,
rest time, total programme time) subject
the muscles to different types of work,
according to muscular fibres. In fact,
different types of muscular fibres may be
distinguished according to their respective
contraction speed: slow, intermediate and
fast fibres. Fast fibres will obviously
predominate in a sprinter, while a
marathon runner will have more slow
fibres. With a good knowledge of human
physiology and a perfect mastery of the
stimulation parameters of the various
programmes, muscular work can be
directed very precisely towards the desired
goal (muscular reinforcement, increased
blood flow, firming up, etc.).