The document discusses faradic current, its effects on the body, various techniques of application, and indications for use in muscle contraction facilitation and rehabilitation. It outlines the physiological principles behind faradic current, including its effects on different body tissues and contraindications for treatment. Additionally, it details methods of application, such as motor point stimulation and bath methods, while noting their advantages and disadvantages.

1. FARADIC
CURRENT

2. Contents of Lecture
Effects of Current on body
Faradic Current
Production
Modified Faradic Current
Indication & Uses
Methods of Application
Contra-Indications

3. Electric current and body
 Tissue of body ___ capable of transmitting
current because Tissue fluid contain ions.
 Conductivity of different tissues varies depend on
amount of fluid that they contain
 Muscles___ Good blood supply
 Fat_____ poor conductor
 Epidermis ____ high resistance (1000 ohm or
more) ___little fluid
 In applying electric treatment appropriate
measures are used to reduce its resistance

4. True Faradic Current
It is an unevenly direct current, with one
phase of high amplitude and short duration
and the other phase of low amplitude and
longer duration
Pulse duration__ 1ms
Frequency __ 50 Hz

5. Faradic-Type Current
 Interrupted direct current
 Short duration
 Stimulate normal (innervated muscles)
 Frequency 50-100 per second
 Pulse duration 0.2-1 ms

6. Modified Direct current
Faradic current can be modified by
interruption and surging.
In surging, surged duration, frequency,
wave form and surged interval are used.

8. Tetanic contraction
Near Normal tetanic like contraction and
relaxation of muscle
To produce a tetanic contraction by
faradic type of current stimuli must be
applied at a rate of at least 30 stimuli per
second
The strength of muscle contraction depend
on the number of motor units bring about
into action

9. Surged Current
 Intensity of successive impulses
increases gradually, each impulse
reaching a peak value greater than the
preceding one, then falls either
suddenly or gradually in surges

10. SURGES
Surges varying in duration and waveform
(Saw tooth, Triangular, Trapezoidal)

11. Advantages:
oIt avoids fatigue
oIt does not give surprise to patient as
current is increases slowly
oContraction of muscle is like
physiological/voluntary contraction

12. Production
Same principle as interrupted direct current
Values of resistance is low to get short
duration and high frequency
4 functional parts
Power supply
 Oscillator circuit
modulating circuit
Amplifying circuit

13. Functional parts
oPower supply: battery or AC
oOscillator circuit: Short duration pulses
of 0.1 to 1ms with a frequency of 50 to 100
Hz)
oModulating circuit: Give surged output
varies frequency)
oAmplifying circuit : (increase the output
voltage appropriately)

14. Originally/True Faradic
Current
Induction coil (Induction Coil, a device for
converting low-voltage direct current (DC)
into high-voltage alternating current (AC).
Two unequal phases
1.Low intensity and long duration
2.High intensity and short duration

15. Electronic Stimulators
Same physiological effect as original
faradic current
Different waveform

16. Physiological
Effects

17. Stimulation of sensory nerves..
 prickling like sensation due to
stimulation of sensory nerves
 cause reflex vasodilation of superficial
blood vessels
 leading to erythema.

18. Stimulation of motor nerves
If sufficient intensity---cause muscle
contraction, 50 times per second----muscle
fatigue,
surging-----fatigue is due to without intervals
of relaxation)

19. Effects of muscle
contraction
o Increased metabolism ad pumping action of
muscles
o Electrical stimulation---Muscle contraction—
increased metabolism----increase in demand for
oxygen and food---- increase in waste products
and metabolites-----dilates the capillaries and
arterioles, increase in blood supply to muscle
o Muscle contract and relax---pumping action on
venous and lymphatic return---direct fluid toward
heart.

20. Stimulation of denervated
muscle
impulse lasting for 1ms and intensity of
current required for producing contraction in
denervated muscle with a faradic current is
too great to be tolerated .
So, its not satisfactory for stimulation of
denervated muscles
On the partially denervated muscles ( to
stimulate partially denervated muscle; higher
intensity than normal muscle is required)

21. Indications/Therapeutic Uses
• Facilitation of muscle contraction
• Re-education of muscle-action
• Training a new muscle action
• Neuropraxia of a motor nerve
• Diagnostic tool
• Improved venous and lymphatic drainage

22. Facilitation of muscle
contraction
Muscle contraction---facilitated by faradic current---used
when pt is unable to produce muscle contraction.
Muscle contraction is inhibited by
 Trauma
 Inflammation
 pain
 surgery
Faradic assists in voluntary contraction.
Example: stimulation of quads after meniscectomy

23. Re-education of muscle-
action
oVoluntary action lost---Prolonged disuse
oIncorrect use (Abductor Hallucis in Hallux
Valgus)

24. Training a new muscle
action
oAfter surgery ------ new movement pattern
must be established
oDuring stimulation pt should attempt to
perform voluntary contraction.

25. Neuropraxia of a motor
nerve
o Impulses from the brain are
unable to pass the site of the
lesion
o Voluntary power is lost

26. Diagnostic Tool
 Innervated muscles will contract in
response to faradic and faradic type
of current at minimal intensity
 Partially innervated muscle will
require more intensity of current
then normal
 Completely denervated muscle
will not respond even at higher
intensity

27. Methods of application
 Motor point stimulation
 Labile Method
 Nerve Conduction Method
 Bath Method
 Faradism Under Pressure

28. Motor Point Stimulation
 Involves stimulation of individuals
muscles
 Indifferent electrode is placed at
the origin of muscle
 Active electrode (handle/pen
electrode) is placed at the motor
point

29. Advantages:
o Each muscle can be
stimulated
o Effect of passive
exercise can be given
to each muscle
o Contraction of individual
muscle can be obtained
o Every muscle can be
stimulated and isolated
muscle contraction
Disadvantages:
 Tedious
 Time consuming
 Difficult to stimulate
the deeply situated
muscle

30. Labile Method
o It is for stimulation of large muscles
with multiple nerve supply
for example trunk muscles
o Indifferent electrode is placed at
origin of muscle or muscles
o Active electrode in form of either
disc or small plate electrode is
moved over area to be treated

31. Nerve Conduction Method
 An indifferent electrode is placed at
convenient place
 Active electrode to a point at which
the nerve trunk is superficial
 Stimulate motor nerve trunk
 Contraction of all the muscles that it
supplies

32. Bath Method
Application of faradic current to the body parts in a
tub, tray or tank containing water
Application of faradic current to foot; faradic footbath
Advantages:
 Skin resistance is lowered
 Perfect contact with tissues
Disadvantages:
 It can not be localized
 Superficial muscles contract to a greater extent
than deeper ones
 Chances of Electric Shocks

33. Faradism Under Pressure
 Treatment of edema to increase the
venous and lymphatic drainage
 Faradic current is applied along with an
elastic bandage such as elasto cerepe
bandage
 Body part which is to be treated is kept
elevated during the treatment
 15-20 minutes

34. Uses
o Edema
o After knee surgeries
o Rheumatoid arthritis
o Tendon transplantation

35. Contra-Indications
o Cardiac Pacemakers
o Impaired sensation
o Impaired mentation (CP)
o Arterial disorders
o Danger of hemorrhage
o Area of defective supply
o Venous disorders (DVT)

36. Contra-indications
o Allergic Rash
o Varicose vein
o Acute Sepsis
o Tumor
o Cardiac patients
o Over the area of head
o Patient with epilepsy
o Open wound