Sauna
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 therapy is often referred to as a type of sauna, but according to the Finnish sauna organizations, infrared is not a sauna.
History
Areas such as the rocky Orkney islands of Scotland have many ancient stone structures for normal habitation, some of which incorporate areas for fire and bathing. It is possible some of these structures also incorporated the use of steam in a way similar to the sauna, but this is a matter of speculation. The sites are from the Neolithic age, dating to approximately 4000 B.C.E. Archaeological sites in Greenland and Newfoundland have uncovered structures very similar to traditional Scandinavian farm saunas, some with bathing platforms and "enormous quantities of badly scorched stones".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 Korean saunas 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. 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. 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 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 when the two nations fought together against the Soviet Union. Saunas were so important to Finnish soldiers that they built them not only in mobile tents but even in bunkers. 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.
Etymology
The word sauna is an ancient Finnish word referring to both the traditional Finnish bath and to the bathhouse itself. In Finnic languages other than Finnish and Estonian, sauna and cognates do not necessarily mean a building or space built for bathing. It can also mean a small cabin or cottage, such as a cabin for a fisherman. The word is the best known Finnicism in many languages.Petri Kallio has proposed a Germanic etymology, a hypothesis which has gained some scholarly support. In this account, the word is derived from Proto-Germanic *stakka- or its earlier Palaeo-Germanic form. The Germanic word is cognate with English stack and originally denoted a pile or heap, interpreted here as referring to an early sauna oven consisting of a pile of stones. The loan word would have developed into Proto-Finnic *sakna, from which the Finnish sauna later evolved.
Modern saunas
The sauna known in the Western world today originates from Northern Europe. In Finland, there are built-in saunas in almost every house, including communal saunas in the older apartment buildings; since the 80s, private saunas have often been built into the bathrooms of typical Finnish flats in apartment buildings, sometimes even in student housing. There are also many public saunas in Finland, including Rajaportin Sauna, a sauna located in Tampere, that was first established in 1906 by Hermanni and Maria Lahtinen. Helsinki even has a sauna built into one of the gondolas of a Ferris wheel, SkyWheel Helsinki. Unlike many other countries, Finnish people usually prefer to be naked instead of wearing a swimsuit, towel, or other kind of clothing.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 Finnish 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 North American, Western European, Japanese, Russian, and South African public sport center and gyms include sauna facilities. They may also be present at public and private swimming pools. 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.
Use
A modern sauna with an electric stove usually takes about 15–30 minutes to heat up. Some users prefer taking a shower beforehand to speed up perspiration in the sauna. When in the sauna, people often sit on a towel for hygiene and put a towel over their heads if the face feels too hot but the body feels comfortable. In Russia, a felt "banya hat" may be worn to shield the head from the heat; this allows the wearer to increase the heat on the rest of the body. The temperature of one's bath can be controlled via:- the amount of water thrown on the stove: this increases humidity so that sauna bathers perspire more copiously
- the length of one's stay in the sauna
- positioning: the higher benches are hotter, whereas the lower benches are cooler. Children often sit on the lower benches.
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. Contact lenses 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 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 gymnasium. 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.