Current Parameters; Pulse Shape; Pulse Frequency; Pulse Width - Beurer EM 40 Gebrauchsanleitung

3. Current parameters

Electrical stimulation machines operate with the following current settings,
which will alter the stimulation effect depending on the setting.

3.1 Pulse shape

This describes the time function of the excitation current
whereby monophase pulse trains are differentiated from
biphase. With monophase pulse trains, the current flows in
one direction. With biphase pulses, the excitation current
alternates its direction.
In the Digital TENS/EMS unit, there are only biphase pulse
trains, as they reduce the strain on the muscle, leading to less muscle fatigue
as well as safer application.

3.2 Pulse frequency

Frequency indicates the number of individual pulses per
second, and is indicated in Hz (Hertz). It can be calculated
by working out the inverse value of the periodic time. The
respective frequency determines which types of muscle fibre preferably react.
Slow-response fibres tend to react to lower pulse frequencies up to 15 Hz,
while fast-response fibres only respond to frequencies over approx. 35 Hz.
With pulses of approx. 45-70 Hz, there is permanent tension in the muscle
combined with premature muscle fatigue. Higher pulse frequencies can therefore
preferably be used for elasticity and maximum strength training.

3.3 Pulse width

Pulse width is used to indicate the duration of an individual
pulse in microseconds. Pulse width also determines the pene-
tration depth of the current whereby in general, the following
applies: a greater muscle mass requires a greater pulse width.

3.4 Pulse intensity

Setting the degree of intensity is individually dependent on
the subjective feeling of each individual user and is deter-
mined by a number of parameters such as application site,
skin circulation, skin thickness as well as quality of electrode contact. The actual
setting should be effective but should never produce any unpleasant sensations
such as pain at the site of application. While a slight tingling sensation indicates
sufficient stimulation energy, any setting which leads to pain must be avoided.
With prolonged application, readjustment may be necessary due to time adjust-
ment processes at the site of application.

3.5 Cycle-controlled pulse parameter variation

monophase pulses
In many cases it is necessary to cover the entirety of tissue structures at
the site of application by using several pulse parameters. With the Digital
time
TENS/EMS unit, this is done by the existing programmes automatically making
biphase pulses
a cyclical pulse parameter change. This also prevents individual muscle groups
at the site of application from getting tired.
With the Digital TENS/EMS unit there are useful presettings for current para-
meters. During the application, however, you do have the possibility of changing
pulse intensity at any time and, with individual programmes, you can also alter
pulse frequency beforehand in order implement the application which is the
most comfortable or promises the most success for you.
periodic time

4. Unit description

4.1 Description of components

Display (main menu):
A Pulse intensity
B Programme/cycle numbers
C Frequency (Hz)
D Low battery
E TENS/EMS/MASSAGE submenus
F Timer function (residual time indicator)
Pulse width
G Operating status display
Keys:
a UP and
b ENTER key
c ON/OFF key
d MENU key
e CH1+, CH1-, CH2+, CH2- keys
20
B
C
D
DOWN selection keys
a
b
A
E
F
G
c
d
e