Infrared saunas are taking the wellness world by storm. Infrared saunas are different from traditional saunas in that they heat your body by infrared emitters rather than by steam. Full spectrum emitters use IFR-A so that they can penetrate deeply. They are used with IR-B and IR-C. Full-spectrum emitters such as Philips Vitae Lamps use IFR-C so as to warn you that you are in danger physically if the ambient temperature becomes too hot or cold. This can save your life, because you’ll be able to determine unsafe temperatures before you are injured or worse.
IFR-As that generate wavelengths below 1 micron are forbidden for personal use and are used only in medical circumstances.
Rainer Brenke, M.D., of Hufeland Clinic, Bad Ems, Germany, states that infrared A’s heat supplies the radiation, with its initial heating going as deep as the dermis within the skin. There’s only slight thermal stress of heat receptors within the epidermis. There’s a possibility that your body core temperature will rapidly increase if there is a large dose and you expose yourself in full body.
With full body application, there’s no thermal stress of the respiratory tract and the body can help to maintain homeostasis by using such cooling techniques as sweating.
Infrared B and C also supply heat through radiation, with a primary heating of the epidermis. However, there’s distinct thermal stress within the epidermis of the heat receptors. This helps protect your body against hypothermia. There’s only a gradual slight increase of body core temperature.
Dr. Brenke’s conclusion is that how far the infrared waves penetrate into the skin depends largely on the wavelength, but it also depends on spectral reflection and your skin’s absorption properties. As with visible light, up to half of the shortwave infrared A radiation is not absorbed by the skin. However, reflection rate of your skin is much lower in the B and C ranges. There, reflection is usually at 3 to 8%. How much your skin will absorb is largely determined by water content. Most infrared B and C radiation is absorbed at the skin’s surface, whereas if you are exposed to infrared A radiation, it will penetrate more deeply into your skin and is also absorbed in deeper skin layers. The effects and sensation of the heat radiation depends on where the heat receptors are located.
These receptors are located in the upper layers of skin, closer to its surface. Therefore, these would be irritated much more by the longwave infrared B and C radiation than by the shortwave infrared A.
This results in two effects, which either becoming overheated from the exposure or by experiencing pain. Usually, you are not as exposed to infrared B or C because you will be warned off exposure relatively early in the process by either becoming overheated or even experiencing pain, which can prevent overheating and potential injury.
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The infrared sauna is found in more and more wellness clubs. Traditional sauna enthusiasts are discovering the benefits from the infrared sauna and the infrared sauna is gaining popularity fast Get more information regarding infrared sauna.
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Reference
1. http://en.wikipedia.org/wiki/Infrared_sauna
2. 
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