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Cryosauna (Cryochamber) is a device used in therapeutic treatment with cold, cryotherapy. Its main purpose lies in strengthening the immune system of the human body. First production of cryosaunas started at the beginning of the 21st century. There are several large producers of cryosaunas in the world today and have been growing in numbers in recent years. Most production is concentrated in Central and Eastern Europe, yet distribution is on the global level.
The cryosauna reduces outer skin temperature from 32.5 °C to -12 °C in 60 seconds or less maintaining it at this level for up to 3 minutes. This is done by bursting liquid nitrogen inside the cryosauna and lowering the temperature inside to under -160 °C while sometimes reaching even lower temperatures, depending on set values. The sensors on the skin surface, send a signal to the brain which in turn stimulates all regulatory bodily functions. Blood rushes from the peripheral parts of the body towards the core as part of a natural defense mechanism. Subsequently, the brain redistributes the blood supply while prioritizing those areas that are most in need of maintenance or repair. 
The system mixes vapors of liquid nitrogen with fresh air to provide very low temperatures inside the cabin during a session. Cryotherapy stimulates the immune system and induces processes for recovery in the body. Cryotherapy is popular in sports medicine and physiotherapy. Sportsmen undertake cryotherapy procedures in order to increase their chances for faster recovery from injuries. The beauty and cosmetics industries are using cryotherapy to improve blood-circulation, to make skin look and feel healthier, to fight age-related deficiencies and for the removal of toxins from the body. In medicine, cryogenic chamber procedures are expected to help to recover after illness or surgery, help to treat skin diseases, help to increase general improvement of health during various diseases.
Cryotherapy is the local or general use of low temperatures in medical therapy. Cryotherapy is used to treat a variety of benign and malignant tissue damage, medically called lesions. The term "cryotherapy" comes from the Greek cryo (κρύο) meaning cold, and therapy (θεραπεία) meaning cure. Cryotherapy has been used as early as the seventeenth century.
Its goal is to decrease cell growth and reproduction (cellular metabolism), increase cellular survival, decrease inflammation, decrease pain and spasm, promote the constriction of blood vessels (vasoconstriction), and when using extreme temperatures, to destroy cells by crystallizing the cytosol, which is the liquid found inside cells, also known as intracellular fluid (ICF). The most prominent use of the term refers to the surgical treatment, specifically known as cryosurgery. Other therapies that use the term are cryogenic chamber therapy and ice pack therapy.
Medicine and physiotherapy: hospitals, clinics, rehabilitation centers, resorts
Cosmetics: clinics, beauty salons, SPA centers
Sports: sports clubs, fitness and gym centers
Rehabilitation: resorts, wellness
Numerous accounts of research and studies have been conducted in the area of cryotherapy. Great majority of researchers have come to the conclusion that cryotherapy indeed has positive effects on bodily functions. Nevertheless, many also tend to conclude their studies with remarks about further needs in researching the specific effects.
Tarja Westerlund; Oulu, 2009; Thermal, Circulatory,and Neuromuscular Responses to Whole-Body Cryotherapy; UNIVERSITATIS OULUENSIS: http://herkules.oulu.fi/isbn9789514290435/isbn9789514290435.pdf
Welch V, Brosseau L, Casimiro L, Judd M, Shea B, Tugwell P, Wells GA; The Cochrane Library 2011, Issue 10; Thermotherapy for treating rheumatoid arthritis (Review); www.update-software.com/pdf/CD002826.pdf
Podbielska, H. – Strek, W. – Mueller, G.J. – Bialy, D.; Poland, 2006; Acta Biomedical Engeneering vol. 1-1-2006, Whole body cryotherapy; http://link.springer.com/article/10.1007/s10973-012-2741-4/fulltext.html