Interferential Therapy Interferential Current (IFC) What is IFT and how does it work

Posted by Sourabh Mutreja on

What is IFT and how does it work?


What is IFT? 

Interferential Therapy or (IFT)  is a type of electrotherapy treatments that use electric currents to stimulate tissue which provides pain relief, reduction of swelling and many other health benefits.

IFT uses a range of frequencies which stimulate the body to get positive reactions such as increasing blood supply in an area which increases the healing speed.

IFT physiotherapy

In the USA, Interferential Therapy is approved for the symptomatic relief and management of chronic (long-term) intractable, post-traumatic and post-surgical pain. Many medical professionals use Interferential Therapy for its drug-free, non-invasive promotion of healing and pain relief. IFT in physiotherapy has become incredibly popular due to the ease of use, lack of side effects and the amazing feedback from people suffering from a variety of different conditions.

It has been shown that multiple daily treatments provide improved results.

Home treatment can help reduce pain, medication, and edema.

Interferential machines can be used to treat pain associated with:

  • Back, Neck, and Shoulder Pain
  • Osteoarthritis
  • Rheumatoid Arthritis
  • Osteoporosis
  • Spondylitis and Ankylosing Spondylitis
  • Bruising and Swelling
  • Postoperative Pain
  • Epicondylitis
  • Carpal Tunnel Syndrome
  • Plantar Fasciitis
  • Constipation
  • Fibromyalgia
  • Joint Injuries
  • Overuse Injuries and Surgical Procedures
  • Edema and Inflammation
  • Tennis Elbow
  • Sports Injuries


How Interferential Therapy works

Unlike TENS machines, which delivers intermittent pulses to stimulate surface nerves and block the pain signal, IFT machines deliver a continuous stimulation deep into the affected tissue. The stimulation both blocks pain and reduces swelling and inflammation which can cause pain.

IFT achieves the deep penetration by using a 4000Hz carrier wave to overcome the skin impedance.

4 pole interferential works by putting two signals into the tissue at slightly different frequencies. Where they cross over, the two signals “interfere” to produce a lower frequency, therapeutic current. In theory, this interference current is generated in the pattern shown in the diagram. In practice, the tissues do not conduct uniformly, so the currents rarely interfere in the expected target area. Therapists commonly use moveable electrodes to “hunt” for the best electrode positions. 


Interferential Therapy as part of a treatment regime 

The use of IFT should be considered a part of the whole treatment of the condition.

The whole treatment may include: 
• Exercises to stretch injured muscles
• Exercises to move stiff joints 
• Exercises to strengthen muscle groups to support the joints


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