Because infrared ray itself is radioactive, it has strong penetrating power to human skin and subcutaneous tissue, but the intensity of infrared radiation at different wavelengths may be different.
Medical infrared rays can be divided into near infrared rays and far infrared rays. It contains heat energy, and the heat of the sun is mainly transmitted to the earth through infrared rays. Medical infrared mainly includes near infrared, short-wave infrared, medium-wave infrared and long-wave infrared. ?
Near-infrared or short-wave infrared, with a wavelength of 0.76 ~ 1.5 micron, penetrates into human tissues for about 5 ~ 10 mm. Far-infrared or long-wave infrared, with a wavelength of 1.5 ~ 400 micron, is mostly absorbed by superficial skin, and the depth of penetration into tissues is less than 2mm.
Extended data
The efficacy of far infrared rays
Far infrared rays can improve blood circulation.
Because far infrared rays can penetrate deep into human subcutaneous tissue, the use of far infrared ray reaction can increase the temperature of deep subcutaneous skin, dilate microvessels, promote blood circulation, revive enzymes, and strengthen the metabolism of blood and cell tissue, which is of great help to cell rejuvenation and can improve anemia.
Regulating blood pressure: Hypertension and arteriosclerosis are generally caused by contraction and stenosis of arterioles such as nervous system, endocrine system and kidney. Far infrared rays dilate capillaries, promote blood circulation, reduce hypertension and improve hypotension symptoms.
Far infrared rays can regulate autonomic nerves.
Autonomic nerve mainly regulates visceral function. People are in a state of anxiety for a long time, and the autonomic nervous system is constantly tense, which will lead to decreased immunity, headache, dizziness, insomnia and fatigue, and cold limbs. Far infrared rays can regulate autonomic nerves and keep them in the best condition, and all the above symptoms can be improved or eliminated.
Refer to Baidu Encyclopedia-Infrared Lamp
Refer to Baidu Encyclopedia-Far Infrared