Sinusoidal current is evenly alternating sine wave currents having a frequency of 50hZ. It gives 100 pulses or phases in one second of 10 ms each, 50 in on direction and 50 in the other. It can be generated by reducing the voltage in 60 or 80 volts with the step down transformer. It is alternative current of low frequency current.

1. Sinusoidal current
DR.ARJUN PATEL (MPT, DNHE)

2. Definition
• sinusoidal currents are evenly sine wave
alternating currents with a frequency of 50 Hz.
• The sine wave or sinusoid is a
mathematical curve that describes a smooth
repetitive oscillations.

4. • It is produced from the mains by reducing
the voltage to 60 to 80 volts with a step
down transformer.
• This gives 100 pulses or phases in
each second, 50 in one direction and
50 in other.
• It is usually surged to cause rhythmical
muscle contractions.
• It relieves pain and reduces edema.
• Because of its marked sensory
stimulation this current is often used
over large areas and rarely used for
local muscle stimulation.

5. Sinusoidal current
• Similar to faradic current
• Alternating current that produces
mechanical contractions that tone
the muscles
• Produce impulses on muscles &
force them to contract;

6. Advantages
•Supplies greater stimulation,
deeper penetration, & is less
irritating than faradic current
•Soothes the nerves &
penetrates into deeper
muscle tissue
•Is best suited for the
nervous client

7. EFFECTS OF SINUSOIDAL CURRENT
• STIMULATION:-When it is applied
continuously, it causes a tetanic muscle
contraction and tingling sensation due to
stimulation of motor and sensory nerves.
• It is usually surged to cause a rhythmical
muscle contraction.
• The sensory stimulation help for pain
relief by the mechanism, same as that
of TENS and the rhythmic muscle
contraction help in relief of edema.

8. EFFECTS OF SINUSOIDAL CURRENT
• Metabolism:-It also helps for enhancing
blood flow and intramuscular metabolism.
• Reduction of edema: The unsurged
sinusoidal current also helps for reduction
of edema inflammatory exudates.

9. APPLICATION:
• Sinusoidal currents can be applied in the
same way as other low frequency currents
by means of Electrodes and pads.
• This current is applied to large areas
due to marked sensory stimulation.
• It is rarely used for local muscle
stimulation.

10. Indications
• Pain:-For pain control continuous
sinusoidal current is applied at intensity
close to patient tolerance and applied for
approx.. 5 min and repeat if there is
insufficient immediate side effects.
• Edema:-For reduction of edema and to
increase the limb circulation surged
sinusoidal current is suggested; causing
rhythmical muscle pumping action.

11. Indications
• Used during scalp & facial
manipulations
• Sinusoidal current is rarely
used in modern Physiotherapy.

12. Contraindications:
• Skin lesions
• Unstable fracture.
• Impaired cognitive
ability
• Pregnancy
• Over Carotid sinus
• Cancer.
• Cardiac pacemakers.
• Superficial metals

13. • THANK YOU