Deep heat melts down fat, discharges body wastes by increasing lymph and blood circulation, stimulates and produces collagen and elastin, and increases expansibility of fibrillary collagen tissues.
When electrical energy is applied, molecules consisting tissues vibrate and cause friction whenever the direction of the electric current alters. In the meantime, bio-heat is generated by movements of rotation, collision, and twist.
Such a high-frequency energy converted into bio-energy increases temperature of the tissues, enhances cell functions, and increases blood flow rate. When the local temperature of tissues increases over 40 degrees, arteries and capillaries are expanded by direct effects, defense mechanism is improved due to increases blood flow rates, and ultimately blood circulation and metabolism are enhanced. Increased blood flow rates in capillaries by the generation of deep heat are 4~5 times higher during a resting phase.
Control of the skin blood amount
histamine-like substance - axon reflex - spinal reflex
Muscle blood flow control
Blockage of the pain - Contracture-Pain
Muscle spasm relief
Increase of the muscle temperature → Decrease of Ⅱ group nerve fiber excitement discharge, increase of the excitement discharge of the ib fiber of GTO ⇒ Decrease of –MN discharge → Decrease of the vitalization of nervous extrafusal fiber Increase of the temperature of the skin over muscles → Decrease of -MN vitalization → decrease of the discharge of the group II discharge ⇒ decrease of -MN vitalization → Alleviation of muscle contraction
Changes nerve conduction velocity
the tissue temperature increases by 1.0℃ in chronaxie, increase of rheobase, and in changing the nerve conduction speed – the nerve conduction speed increases by 1.8-4m/s
Strength & endurance change
The characteristic of connective tissue – change of viscosity elasticity
⇒ Increase of extensibility , When stretched at the local temperature of 40-45 ℃, maximum extension without tissue damage is caused