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Interfering current - interferential therapy

Interfering (Nemec) current is created from two sinusoidal alternating currents overlapping in intensity, phase, and frequency. It happens in deep tissue.
Interfering current is a middle-frequency current with a 4000 Hz entering frequency.
Considering the frequency of sinusoidal alternating current , its intensity, and phase, we can have three types of interference:

  • additive
  • detracting superposition
  • superposition with intensity annihilation

Interference happens with crossing two sinusoidal alternating currents at a 90 degrees angle. The entering frequency of the first one is 4000 Hz, and the other 3900 or 4100 Hz, creating an interfering current of a 100 Hz frequency.

Interfering current is used in three different ways
  • static interference – electrodes are immobile during the treatment, and affect a single spot between them
  • mobile or kinetic interference has a greater therapeutical effect, and the physcal therapist moves the electrodes manually
  • dynamic interference – the procedure is automatized

Interfering current is similar to diadynamic current , but with stronger and deeper effect along with better sustainability when combined with vibrational massage. Interfering current stimulates callus creation, thus enhancing the bone tissue growth.

Metals are not contraindicative for using interference current !
Therapy lasts 10-15 days, except in callus stimulation (4 weeks). A single treatment takes 20-30 minutes, depending on the indications for it.

When to use interference current :
  • rheumatic diseases
  • paresis and paralysis
  • blood vessel diseases
  • certain orthopedic diseases
When not to use interference current :
  • acute inflammations, active bone, joint, and other organs tuberculosis
  • malign diseases
  • diseases that influence the development of cachexia
  • decompensated heart condition
  • hemorrhaging or proneness to hemorrhaging
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