Technology guide
Radiofrequency in aesthetics: principles and how it works
Radiofrequency gently heats the dermis to firm the skin. How it works, the difference between monopolar and bipolar, and how to build a course of treatment.
Definition
Radiofrequency uses a high-frequency alternating electrical current that passes through the skin. When it meets the resistance of the tissues, this current produces heat, like an electrical resistor. The dermis is brought to a controlled temperature, around 40 to 45 °C according to the source.
Monopolar or bipolar
In monopolar mode, the current leaves an active electrode and reaches a plate placed elsewhere on the body: it penetrates deeply but heats more diffusely and can be less comfortable. In bipolar mode, the current flows between two closely spaced electrodes on the same handpiece: the heat stays more superficial and better controlled. The BodyPerfect III uses bipolar radiofrequency.
Two effects
An immediate effect: the heat contracts the collagen fibres and the skin looks tighter for a few hours to a few days. A lasting effect: the heating reactivates the fibroblasts, which produce new collagen for several weeks.
Settings
Power, target temperature monitored at the surface, session length, type of electrodes and cooling of the epidermis. Slight redness at the end of the session is a sign that the heat has been reached; sharp pain means the power must be lowered.
The course of treatment
The effect builds up over several closely spaced sessions (the source mentions 6 to 10 sessions a few days apart), followed by maintenance. Radiofrequency combines well with LED, with cavitation on the body and with HIFU on the face, provided the treatments are spaced out.
Precautions
No radiofrequency on an area with a metal or electronic implant, during pregnancy or on infected skin. Temporary redness and warmth are normal; avoid saunas, hot baths and intensive sport for 48 hours.