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Interferential is a form of TENS which uses two alternating medium frequency currents. The two currents are applied simultaneously and where they cross, form an area of wave interference which results in a modulated frequency equal to the difference in frequency of the two waves.
What does Interferential do?
Interferential stimulates the muscle in a way similar to a normal muscle contraction. It helps to reduce pain in the same way as TENS, using the pain-gate theory and also affects the circulation. At low frequencies of 0-10 Hz muscle stimulation occurs which helps the removal of any build-up of swelling. At higher frequencies, of 90-100 Hz, vasodilation occurs and increases the blood flow to the area to help healing.
What can Interferential be used for?
Interferential can be used to treat a large range of musculoskeletal injuries including those where swelling and muscle spasm are present. Joint pain can also be treated effectively by interferential stimulation. Specific injuries include back pain; frozen shoulder; patellofemoral knee pain; meniscus injuries; sacroiliac joint pain….the list goes on!
What are the Contraindications?
Interferential should not be used in the following situations:
- When there are sensory disturbances
- Local infection
- Malignant tumors
- Deep vein thrombosis
- Circulatory conditions
- Over or near a pacemaker