A sauna (, ) is a room or building designed as a place to experience dry or wet heat sessions or an establishment with one or more of these facilities. The steam and high heat make the bathers perspire. A thermometer in a sauna is used to measure temperature; a hygrometer can be used to measure levels of humidity or steam. Infrared sauna is often referred to as a type of sauna, but according to the Finnish sauna organizations, infrared is not a sauna.
The traditional Korean sauna, called the hanjeungmak, is a domed structure constructed of stone that was first mentioned in the Sejong Sillok of the Annals of the Joseon Dynasty in the 15th century. Supported by Sejong the Great, the hanjeungmak was touted for its health benefits and used to treat illnesses. In the early 15th century, Buddhist monks maintained hanjeungmak clinics, called hanjeungso, to treat sick poor people; these clinics maintained separate facilities for men and women due to high demand. Korean sauna culture and kiln saunas are still popular today, and jjimjilbang are ubiquitous.
Western saunas originated in Finland where the oldest known saunas were made from pits dug in a slope in the ground and primarily used as dwellings in winter. The sauna featured a fireplace where stones were heated to a high temperature. Water was thrown on the hot stones to produce steam and to give a sensation of increased heat. This would raise the apparent temperature so high that people could take off their clothes. The first Finnish saunas were always of a type now called savusauna; "smoke sauna". These differed from present-day saunas in that they were operated by heating a pile of rocks called a kiuas by burning large amounts of wood for about 6 to 8 hours and then letting out the smoke before enjoying the löyly, a Finnish term meaning, collectively, both the steam and the heat of a sauna (in the closely related Estonian, the equivalent term is leili). A properly heated "savusauna" yields heat for up to 12 hours. As a result of the Industrial Revolution, the sauna evolved to use a wood-burning metal stove with rocks on top, kiuas, with a chimney. Air temperatures averaged around but sometimes exceeded in a traditional Finnish sauna. As the Finns migrated to other areas of the globe, they brought their sauna designs and traditions with them. This led to a further evolution of the sauna, including the electric sauna stove, which was introduced in 1938 by Metos Ltd in Vaasa. Metos Ltd (in Finnish) Although sauna culture is more or less related to Finnish and Estonian culture, the evolution of the sauna took place around the same time in Finland and Baltic states countries; they all have valued the sauna, its customs and traditions until the present day.
The sauna became very popular especially in Scandinavia and the German-speaking regions of Europe after the Second World War. German soldiers had experienced Finnish saunas during their fight against the Soviet Union during the Continuation War, where they fought on the same side. Saunas were so important to Finnish soldiers that they built them not only in mobile tents but even in bunkers.Manfred Scheuch: Nackt; Kulturgeschichte eines Tabus im 20. Jahrhundert; Christian Brandstätter Verlag; Wien 2004; pages 156ff After the war, the German soldiers brought the custom back to Germany and Austria, where it became popular in the second half of the 20th century. The German sauna culture also became popular in neighbouring countries such as Switzerland, Belgium, the Netherlands, and Luxembourg.
Sauna culture has been registered in the Representative List of the Intangible Cultural Heritage of Humanity under two entries: "Smoke sauna tradition in Võromaa" in 2014 and "Sauna culture in Finland" in 2020.
Under many circumstances, temperatures approaching and exceeding would be completely intolerable and possibly fatal to a person exposed to them for long periods. Saunas overcome this problem by controlling the humidity. The hottest Finland saunas have relatively low humidity levels in which steam is generated by pouring water on the hot stones. This allows air temperatures that could evaporate water to be tolerated and even enjoyed for longer periods. Steam baths, such as the hammam, where the humidity approaches 100%, will be set to a much lower temperature of around to compensate. The "wet heat" would cause scalding if the temperature were set much higher.
In a typical Finnish sauna, the temperature of the air, the room, and the benches are above the dew point even when water is thrown on the hot stones and vaporized. Thus, they remain dry. In contrast, the sauna bathers are at about , which is below the dew point, so that water is condensed on the bathers' skin. This process releases heat and makes the steam feel hot.
Finer control over the perceived temperature can be achieved by choosing a higher-level bench for those wishing for a hotter experience, or a lower-level bench for a more moderate temperature. A good sauna has a relatively small temperature gradient between the various seating levels. Doors need to be kept closed and used quickly to maintain the temperature and to keep the steam inside.
Some , , , , and public sport center and gyms include sauna facilities. They may also be present at public and private . As an additional facility, a sauna may have one or more jacuzzi. In some spa centers, there are the so-called special "snow rooms," also known as cold saunas or cryotherapy. Operating at a temperature of , the user is in the sauna for only about three minutes.
According to the Guinness Book of World Records, the world's largest sauna is the Koi Sauna in the Thermen & Badewelt Sinsheim, Germany. It measures 166 square meters, holds 150 people, and sports a koi aquarium. The title may now belong to Cape East Spa in Haparanda, Sweden, which also holds 150 people but is more spacious.
However, in Czeladz, south Poland, there is now a sauna for 300 people, sporting light shows, theatre, and several sauna masters.(See http://www.palacsaturna.pl/en/ )
The heat is greatest closest to the stove. Heating from the air is cooler on the lower benches as the hot air rises. The heat given by the steam can be very different in different parts of the sauna. As the steam rises directly upwards, it spreads across the roof and travels out towards the corners, where it is then forced downwards. Consequently, the heat of fresh steam may sometimes be felt most strongly in the furthest corners of the sauna. Users increase the duration and the heat gradually over time as they adapt to the sauna. When pouring water onto the stove, it cools down the rocks, but carries more heat into the air via advection, making the sauna warmer.
Perspiration is the result of autonomic responses trying to cool the body. Users are advised to leave the sauna if the heat becomes unbearable, or if they feel faint or ill. Some saunas have a thermostat to adjust the temperature, but the owner of the sauna and the other bathers expect to be consulted before changes are made. The sauna stove and rocks are very hot—one must stay well clear of them to avoid burns, particularly when water is thrown on the rocks, which creates an immediate blast of steam. Combustibles on, or near the stove have been known to cause fires. dry out in the heat. Jewelry or anything metallic, including glasses, will get hot in the sauna and can cause discomfort or burning.
The temperature on different parts of the body can be adjusted by shielding one's body with a towel. Shielding the face with a towel has been found to reduce the perception of heat. Some may wish to put an additional towel or a special cap over the head to avoid dryness. Few people can sit directly in front of the stove without feeling too hot from the radiant heat, but this may not be reflected in their overall body temperature. As the person's body is often the coolest object in a sauna room, steam will condense into water on the skin; this can be confused with perspiration.
Cooling down by immersing oneself in water (in a shower, lake, or pool) is a part of the sauna cycle and is as important as the heating. However, healthy people and heart patients alike should take some precautions if plunging into very cold water straight after coming from the hot room, as the rapid cooling of the body produces considerable circulatory stress. It is considered good practice to take a few moments after exiting a sauna before entering a cold plunge and to enter a plunge pool or a lake by stepping into it gradually, rather than immediately immersing oneself fully. In summer, a session is often started with a cool shower.
In some countries, the closest and most convenient access to a sauna is at a . Some public pools, major sports centers, and resorts also contain a sauna. Therapeutic sauna sessions are often carried out in conjunction with physiotherapy or hydrotherapy; these are gentle exercises that do not exacerbate symptoms.
There is evidence that long-term exposure to Finnish-style sauna is correlated with a reduced risk of sudden cardiac death; and that risk reduction increases with duration and frequency of use; this reduction is more pronounced when sauna bathing is combined with exercise, compared with either of these practices alone. Tentative evidence supports that the heat stress from saunas is associated with reduced blood pressure and arterial stiffness, and therefore also decrease the risk of cardiovascular disease. These benefits are more pronounced in persons with low cardiovascular function. Evidence exists for the benefit of sauna on people with heart failure. Frequent Finnish-style sauna usage (4-7 times per week) is associated with a decreased risk of neurovascular diseases, including Alzheimer's disease and stroke, relative to those individuals who used sauna once per week. Individuals suffering from musculoskeletal disorders could have symptomatic improvement from sauna, and it could be beneficial for glaucoma. It also is associated with a reduced risk and symptom relief from the symptoms of respiratory illness. Weight loss in obese people and improvement of appetite loss present with normal body weight can also be achievable with sauna bathing.
Evidence for the use of sauna for depression or is insufficient, but the frequency of sauna sessions is correlated with a diminished risk of developing psychosis, and it might be beneficial for psoriasis.
Pregnant women can use saunas as long as their core temperature does not exceed , as this may be teratogenic.
One study has found that genital heat stress from frequent sauna sessions could cause male infertility.
Fire-heated saunas are common in cottages, where the extra work of maintaining the fire is not a problem.
In Japan, many saunas exist at sports centers and public Public bathing (sentō). The saunas are almost always gender separated, often required by law, and nudity is a required part of proper sauna etiquette. While right after World War II, public bathhouses were commonplace in Japan, the number of customers dwindled as more people were able to afford houses and apartments equipped with their own private baths as the nation became wealthier. As a result, many sentōs have added more features such as saunas to survive.
In Korea, saunas are essentially public bathhouses. Various names are used to describe them, such as the smaller mogyoktang, outdoor onsen, and the elaborate jjimjilbang. The word "sauna" is used a lot for its 'English appeal'; however, it does not strictly refer to the original Fennoscandian steam rooms that have become popular throughout the world. The konglish word sauna (사우나) usually refers to bathhouses with Jacuzzis, hot tubs, showers, steam rooms, and related facilities. Laos, herbal steam sauna or hom yaa in Lao language, is very popular, especially with women and is available in every village. Many women apply yogurt or a paste blend based on tamarind on their skin as a beauty treatment. The sauna is always heated by wood fire and herbs are added either directly to the boiling water or steam jet in the room. The sitting lounge is mixed gender but the steam rooms are gender separated. Bael fruit tea known in lao as muktam tea is usually served.
In Canada, saunas have increasingly become a fixture of cottage culture, which shares many similarities with its Finnish counterpart (mökki).
The sauna is an important part of daily life, and families bathe together in the home sauna. There are at least 2 million saunas in Finland according to official registers. The Finnish Sauna Society believes the number can be as high as 3.2 million saunas (population 5.5 million). Many Finns take at least one a week, and much more when they visit their summer cottage in the countryside. Here the pattern of life tends to revolve around the sauna, and a nearby lake used for cooling off.
Sauna traditions in Estonia are almost identical to Finland as saunas have traditionally held a central role in the life of an individual. believed saunas were inhabited by spirits. In folk tradition, the sauna was not only the place where one washed but also used as the place where brides were ceremoniously washed, where women gave birth, and the place where the dying made their final bed.Ivar Paulson, The Old Estonian Folk Religion, Indiana University, 1971 The folk tradition related to the Estonian sauna is mostly identical to that surrounding the Finnish sauna. On New Year's Eve, a sauna would be held before midnight to cleanse the body and spirit for the upcoming year.
The 13th-century bathhouses in the Grand Duchy of Lithuania were mentioned in the Hypatian Codex and Chronicon terrae Prussiae, as they were practised by the Lithuanian dukes. Livonian Chronicle of Henry describes a bathhouse built around 1196 near the pier on the bank of Daugava river. The chronicle also mentions the year 1215 baths of the Latgalians ruler Tālivaldis which were built in Trikāta. These baths are also mentioned in the Livonian Rhymed Chronicle. Sauna had a considerable role in the pagan traditions of the Baltic people. In the 17th century, Matthäus Prätorius described various rituals the Baltic people practiced in the sauna. For example, sauna was a primary place for women to give birth and rites would be performed for the Baltic goddess Laima. At that time, sauna traditions were similar in Aukštaitija, Samogitia, Latgale, Semigallia as well as some West Slavic lands. In 1536, Vilnius gained a royal privilege to build Public bathing, and by the end of the 16th century, the city already had 60 of them with a countless number of private ones. In Latvian lands, bathhouses became particularly popular in the 19th century.
The contemporary Baltic sauna is similar to others in the north-eastern part of Europe: it varies according to personal preference but is typically around , humidity 60–90%, with steam being generated by pouring water on the hot stones.Latvijas Enciklopēdiskā vārdnīca, Nacionālais Apgāds, 2002 Traditionally, birch twigs (; ) are the most common, but oak or Tilia are used too. Sauna enthusiasts also make twigs from other trees and plants, including Urtica and juniper. Dry air sauna of and very low humidity became popular relatively recently; despite being a misconception, it is sometimes locally described as Finnish-type.
There is a fast-growing new British sauna culture consisting mainly of 'wild' outdoor spas, popping up all over the UK.
In Portugal, the steam baths were commonly used by the Castro culture, before the arrival of the Romans in the western part of the Iberian Peninsula. The historian Strabo spoke of Lusitanians traditions that consisted of having steam bath sessions followed by cold water baths. Pedra Formosa is the original name given to the central piece of the steam bath in pre-Roman times.
In German-speaking Switzerland, customs are generally the same as in Germany and Austria, although you tend to see more families (parents with their children) and young people. Also concerning socializing in the sauna, the Swiss tend more to be like the Finns, Scandinavians, or Russians. Also in German-speaking countries, there are many facilities for washing after using the sauna, with 'dunking pools' (pools of very cold water in which a person dips themselves after using the sauna) or showers. In some saunas and steam rooms, scented salts are given out which can be rubbed into the skin for extra aroma and cleaning effects.
In modern Russia, there are three different types of saunas. The first one, previously very popular especially during the 20th century, is the public sauna or the banya, (also known as the Russian banya), as it is referred to among the locals, is similar in context to public bathhouses in Russia, Ukraine and Belarus. The banya is a large setting with many different rooms. There is at least one sauna (Finnish style), one cold pool of water, a relaxation area, another sauna where fellow sauna goers beat other fellow sauna goers with the leafy birch, a shower area, a small cafeteria with a TV and drinks, and a large common area that leads to the other areas. In this large area, there are marble bed-like structures where people lie down and receive a massage either by another sauna member or by a designated masseur. In the resting area, there are also other bed-like structures made of marble or stone attached to the ground where people lie down to rest between different rounds of sauna or at the very end of their banya session. There is also a large public locker area where one keeps one's clothes as well as two other private locker areas with individual doors that can lock these two separate locker rooms.
The second type of sauna is the Finnish sauna type one can find in any gym throughout the world or a hotel. It could be in the locker room or mixed (i. e. male and female together). Attitudes towards nudity are very liberal and people are less self-conscious about their nude bodies.
The third type of sauna is rented by a group of friends. It is similar to the public banya bath house type, except that it is usually more modern and luxurious, and is often rented by groups of friends by the hour for the use of partying and socialising. Here it can be single-sex or mixed-sex.
A cultural legacy of Eastern European Jews in America is the culture of 'shvitz', which used to be widespread on the East Coast and occasionally on the Pacific West Coast.
The sweat lodge, used by several Native American and First Nations traditional ceremonial cultures, is a location for a spiritual ceremony. The focus is on the ceremony, and the sweating is only secondary. Unlike sauna traditions, and most forcefully in the case of the Inipi, the sweat lodge ceremonies have been robustly defended as an exclusively Native expression of spirituality rather than a recreational activity.Mesteth, Wilmer, et al (10 June 1993) " Declaration of War Against Exploiters of Lakota Spirituality ." "At the Lakota Summit V, an international gathering of US and Canadian Lakota, Dakota and Nakota Nations, about 500 representatives from 40 different tribes and bands of the Lakota unanimously passed a "Declaration of War Against Exploiters of Lakota Spirituality". The following declaration was unanimously passed."
Saunatonttu, literally translated as "sauna elf", is a little gnome or tutelary spirit that was believed to live in the sauna. He was always treated with respect, otherwise, he might have caused much trouble for people. It was customary to warm up the sauna just for the tonttu every now and then, or to leave some food outside for him. It is said that he warned the people if a fire was threatening the sauna or punished people who behaved improperly in it—for example, slept, played games, argued, were generally noisy, or behaved otherwise immorally there. Such creatures are believed to exist in different cultures. The Russian banya has an entirely corresponding character called a bannik.
In Thailand, women spend hours in a makeshift sauna tent during the month following childbirth. The steam is typically infused with several herbs. It is believed that the sauna helps the new mother's body return to its normal condition more quickly.
Etymology
Modern saunas
Use
Health effects
Potential health benefits
Potential health risks
Technologies
Heat storage-type
Smoke sauna
Heat storage-sauna
Continuous heat-type
Continuous fire sauna
Electric stove sauna
Far-infrared saunas
Other sweat bathing facilities
Around the world
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Africa
Asia
Australia and Canada
Europe
Nordic and Baltic
Finland and Estonia
Latvia and Lithuania
Norway and Sweden
Dutch-speaking regions
United Kingdom, Atlantic and Mediterranean Europe
German-speaking countries
Hungary
Czech Republic and Slovakia
Russia
North America and Central America
Traditions and old beliefs
See also
Notes
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