Infrared sauna

Last updated
Infrared sauna
Infraszauna 001.jpg
The interior of an infrared sauna
Inventor(s)John Harvey Kellogg
Invention date1891

An infrared sauna uses infrared heaters to emit infrared light experienced as radiant heat which is absorbed by the surface of the skin. Infrared saunas are popular in alternative therapies, where they are claimed to help with a number of medical issues including autism, cancer, and COVID-19, but these claims are entirely pseudoscientific. Traditional saunas differ from infrared saunas in that they heat the body primarily by conduction and convection from the heated air and by radiation of the heated surfaces in the sauna room whereas infrared saunas primarily use just radiation.

Contents

Infrared saunas are also used in Infrared Therapy and Waon Therapy; while there is a small amount of preliminary evidence that these therapies correlate with a number of benefits, including reduced blood pressure, increased heart rate and increased left ventricular function, there are several problems with linking this evidence to alleged health benefits.

History

Radiant heat bath by John H. Kellogg at the USPTO museum Radiant heat bath by John H. Kellogg at the USPTO museum.jpg
Radiant heat bath by John H. Kellogg at the USPTO museum

John Harvey Kellogg invented the use of radiant heat saunas with his incandescent electric light bath in 1891. [1] He claimed that it stimulated healing in the body and in 1893 displayed his invention at the Chicago World's Fair. [1] In 1896 the Radiant Heat Bath was patented by Kellogg and described in the patent as not depending on the heat in the air to heat the body but able to more quickly produce a sweat than traditional Turkish or Russian baths at a lower ambient temperature. [2] The idea became popular, particularly in Germany where "Light Institutes" were set up. [1] King Edward VII of England and Kaiser Wilhelm II of Germany both had radiant heat baths set up in their various palaces. [1] The modern concept of the infrared sauna was revived in the 1970s in Japan as Waon (Japanese: "soothing warmth") Therapy and neonatal beds for newborns use infrared elements to keep the baby warm without being stifled. [1] [3]

Description

Electromagnetic Far Infrared Electromagnetic Far Infrared.jpg
Electromagnetic Far Infrared

Infrared saunas can be designed to look like traditional saunas but cheaper models can be in the form of a tent with an infrared element inside. [1] [4] Infrared saunas differ from other types of sauna such as traditional Finnish saunas mainly in the method of heat delivery. Far infrared light, which is emitted in an infrared sauna at a wavelength of around 10 μm, is felt directly by the body in the form of radiated heat without the need to heat the air around the body first. [5] This results in a lower ambient air temperature allowing for longer sustained stays in the sauna. Infrared light also penetrates the body deeply resulting in a fast and vigorous sweat being produced. The average ambient temperature in an infrared sauna is usually 40–60 °C (104–140 °F) compared to 70–90 °C (158–194 °F) in traditional saunas. [4]

Effects

A 2009 literature review of research on far-infrared saunas (FIRS) concluded that there was limited moderate evidence supporting their efficacy in normalizing blood pressure and treating congestive heart failure. [5] The review found fair evidence from a single study supporting FIRS therapy for chronic pain. [5] They found fair evidence against claims that FIRS reduces cholesterol levels. [5] They found weak evidence, from a single study, supporting FIRS therapy as treatment for obesity. [5] All of the studies in the review were limited: they were small sample sizes, short duration, unvalidated symptom scales, and were conducted by the same core research group. [5]

In February 2021 Steven Novella of Science-Based Medicine commented on the quality of studies in an article entitled "Infrared Saunas for 'Detoxification'" he stated that:

Most of the mainstream attention is on the cardiovascular effects. Using a sauna does correlate with reduced blood pressure (in some, BP may also increase), increased heart rate, increased dermal perfusion with a reduction in organ perfusion, and increased left ventricular function and arterial flexibility. There are several problems with linking this evidence to alleged health benefits. First – these effects are all short term, during the sauna and for 30 minutes following. We don't know if there is any sustained change in cardiovascular function. Second, we don't know that these changes are improvements. This relates to the third issue, it is possible that at least most of these changes may simply be due to dehydration. Reduced blood volume from water loss (similar to a diuretic effect) will reduce the blood pressure and increase the heart rate, relaxing blood vessels to increase perfusion. So perhaps all we are seeing is a transient effect of the dehydration that accompanies using a sauna. [6]

A 2018 systematic review and meta-analysis of nine clinical trials found that five weekly conventional sauna sessions for 2 to 4 weeks was associated with a significant reduction in brain natriuretic peptide (BNP; a marker of heart failure progression) and cardiothoracic ratio (an indicator of heart enlargement), and improved left-ventricular ejection fraction, but no significant effect on left-ventricular end-diastolic diameter, left atrial diameter, systolic blood pressure, or diastolic blood pressure. The review also rated the quality of evidence for these findings as moderate to insufficient, citing a risk of bias and imprecision as the reason for the low evidence rating. The evidence presented by the review supported a therapeutic effect of sauna bathing for heart failure patients but recommended that further studies were needed to be able to draw definitive conclusions. [7]

A 2019 scientific survey found that most people use both infrared and traditional saunas for relaxation and that its use, 5 to 15 times per month, was associated with higher mental well-being. [8]

Use in alternative therapies

There are a number of claims made about the health effects of infrared saunas that are entirely based in pseudoscience and have no evidence to support them. [6]

Claims of detoxification

At the height of the Kaiserburg (2039 m above sea level), the infrared sauna "Thermen Cube Vesta" is directly on the ski slope for warming up. It is located in the Nockberge, municipality Bad Kleinkirchheim, Carinthia, Austria, EU. Infrarotsauna, Thermen Cube Vesta direkt an der Skipiste (2039 m u.A.), Kaiserburg, Karnten.jpg
At the height of the Kaiserburg (2039 m above sea level), the infrared sauna "Thermen Cube Vesta" is directly on the ski slope for warming up. It is located in the Nockberge, municipality Bad Kleinkirchheim, Carinthia, Austria, EU.

Proponents of infrared saunas may, without evidence, advertise benefits of detoxification, or that infrared saunas detoxify to a greater extent than traditional saunas. [9] Proponents of infrared saunas will often claim that because infrared light penetrates the body so deeply, it must detoxify better than other means of sweat induction. [10] Infrared saunas do induce body warmth and sweat much more vigorously and at lower ambient temperatures than traditional saunas or exercise; [4] this does not mean that they detoxify more efficiently, or at all. [9] Sweating removes an insignificant amount of toxins from the body and can be counterproductive to the function of the body's actual detoxification system, the liver and kidneys. [6] [11] Producing more sweat reduces the amount of urine produced by the body, which may actually reduce toxin excretion. [6] [11]

Applications

Fire departments in Texas and Indiana have purchased infrared saunas under the premise that they will prevent cancer and that the firefighters will be able to sweat out inhaled pollutants. [12] Alternative therapists such as naturopaths have advised the use of infrared saunas for the treatment of cancer [13] and autism. [14] Wellness clinics have recommended it to remove radiation [9] and heavy metals [6] from the body, as well as a preventative treatment for COVID-19. [10] [1] Gwyneth Paltrow has also been criticised by experts for recommending infrared saunas as a post COVID-19 treatment. [15]

See also

Related Research Articles

<span class="mw-page-title-main">Naturopathy</span> Form of alternative medicine

Naturopathy, or naturopathic medicine, is a form of alternative medicine. A wide array of practices branded as "natural", "non-invasive", or promoting "self-healing" are employed by its practitioners, who are known as naturopaths. Difficult to generalize, these treatments range from the pseudoscientific and thoroughly discredited, like homeopathy, to the widely accepted, like certain forms of psychotherapy. The ideology and methods of naturopathy are based on vitalism and folk medicine rather than evidence-based medicine, although practitioners may use techniques supported by evidence. The ethics of naturopathy have been called into question by medical professionals and its practice has been characterized as quackery.

<span class="mw-page-title-main">Sauna</span> Type of bathhouse

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 typically 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.

<span class="mw-page-title-main">Sweat lodge</span> North American Indigenous structure and ceremony for prayer and healing

A sweat lodge is a low profile hut, typically dome-shaped or oblong, and made with natural materials. The structure is the lodge, and the ceremony performed within the structure may be called by some cultures a purification ceremony or simply a sweat.

<span class="mw-page-title-main">Hypothermia</span> Human body core temperature below 35 °C (95 °F)

Hypothermia is defined as a body core temperature below 35.0 °C (95.0 °F) in humans. Symptoms depend on the temperature. In mild hypothermia, there is shivering and mental confusion. In moderate hypothermia, shivering stops and confusion increases. In severe hypothermia, there may be hallucinations and paradoxical undressing, in which a person removes their clothing, as well as an increased risk of the heart stopping.

<span class="mw-page-title-main">Premature ventricular contraction</span> Skipped beat with ventricular origin

A premature ventricular contraction (PVC) is a common event where the heartbeat is initiated by Purkinje fibers in the ventricles rather than by the sinoatrial node. PVCs may cause no symptoms or may be perceived as a "skipped beat" or felt as palpitations in the chest. PVCs do not usually pose any danger.

<span class="mw-page-title-main">Heart failure</span> Failure of the heart to provide sufficient blood flow

Heart failure (HF), also known as congestive heart failure (CHF), is a syndrome caused by an impairment in the heart's ability to fill with and pump blood.

Detoxification or detoxication is the physiological or medicinal removal of toxic substances from a living organism, including the human body, which is mainly carried out by the liver. Additionally, it can refer to the period of drug withdrawal during which an organism returns to homeostasis after long-term use of an addictive substance. In medicine, detoxification can be achieved by decontamination of poison ingestion and the use of antidotes as well as techniques such as dialysis and chelation therapy.

<span class="mw-page-title-main">Cupping therapy</span> Pseudoscience whereby suction is applied to the skin

Cupping therapy is a form of pseudoscience in which a local suction is created on the skin with the application of heated cups. As alternative medicine it is practiced primarily in Asia but also in Eastern Europe, the Middle East, and Latin America. The practice of cupping has been characterized as quackery.

<span class="mw-page-title-main">Far infrared</span> Light with 15-1000 μm wavelength

Far infrared (FIR) or long wave refers to a specific range within the infrared spectrum of electromagnetic radiation. It encompasses radiation with wavelengths ranging from 15 μm (micrometers) to 1 mm, which corresponds to a frequency range of approximately 20 THz to 300 GHz. This places far infrared radiation within the CIE IR-B and IR-C bands. The longer wavelengths of the FIR spectrum overlap with a range known as terahertz radiation. Different sources may use different boundaries to define the far infrared range. For instance, astronomers often define it as wavelengths between 25 μm and 350 μm. Infrared photons possess significantly lower energy than photons in the visible light spectrum, with tens to hundreds of times less energy.

<span class="mw-page-title-main">Cooling down</span> Transition to a lower activity level in physical exercise

Cooling down is the transition from intense physical activity to a more typical activity level. Depending on the intensity of the exercise, cooling down after a workout method, such as intense weightlifting, can involve a slow jog or walk.

<span class="mw-page-title-main">Mud bath</span> Bath of mud, commonly from areas where hot spring water can combine with volcanic ash

A mud bath is a therapeutic spa treatment that involves soaking in a bath of warm mud, often in a natural hot spring or geothermal pool. Mud baths have been used for centuries as a way to promote health and relaxation, and are still popular today in many parts of the world.

Detoxification is a type of alternative-medicine treatment which aims to rid the body of unspecified "toxins" – substances that proponents claim accumulate in the body over time and have undesirable short-term or long-term effects on individual health. It is not to be confused with detoxification carried out by the liver and kidneys, which filter the blood and remove harmful substances to be processed and eliminated from the body. Activities commonly associated with detoxification include dieting, fasting, consuming exclusively or avoiding specific foods, colon cleansing, chelation therapy, certain kinds of IV therapy and the removal of dental fillings containing amalgam.

<i>Banya</i> (sauna) Russian steam bath with a wood stove

The banya is a traditional Russian steam bath that utilizes a wood stove. It is a significant part of Russian culture, and is typically conducted in a small room or building designed for dry or wet heat sessions. The high heat and steam cause bathers to perspire.

Heat therapy, also called thermotherapy, is the use of heat in therapy, such as for pain relief and health. It can take the form of a hot cloth, hot water bottle, ultrasound, heating pad, hydrocollator packs, whirlpool baths, cordless FIR heat therapy wraps, and others. It can be beneficial to those with arthritis and stiff muscles and injuries to the deep tissue of the skin. Heat may be an effective self-care treatment for conditions like rheumatoid arthritis.

Maya medicine concerns health and medicine among the ancient Maya civilization. It was a complex blend of mind, body, religion, ritual and science. Important to all, medicine was practiced only by a select few, who generally inherited their positions and received extensive education. These shamans acted as a medium between the physical world and spirit world. They practiced sorcery for the purpose of healing, foresight, and control over natural events.

<span class="mw-page-title-main">Infrared heater</span> Device designed to create radiative heat

An infrared heater or heat lamp is a heating appliance containing a high-temperature emitter that transfers energy to a cooler object through electromagnetic radiation. Depending on the temperature of the emitter, the wavelength of the peak of the infrared radiation ranges from 750 nm to 1 mm. No contact or medium between the emitter and cool object is needed for the energy transfer. Infrared heaters can be operated in vacuum or atmosphere.

<span class="mw-page-title-main">Johann Schroth</span>

Johann Schroth was an Austrian naturopath.

<span class="mw-page-title-main">Heat stroke</span> Condition caused by excessive exposure to high temperatures

Heat stroke or heatstroke, also known as sun-stroke, is a severe heat illness that results in a body temperature greater than 40.0 °C (104.0 °F), along with red skin, headache, dizziness, and confusion. Sweating is generally present in exertional heatstroke, but not in classic heatstroke. The start of heat stroke can be sudden or gradual. Heatstroke is a life-threatening condition due to the potential for multi-organ dysfunction, with typical complications including seizures, rhabdomyolysis, or kidney failure.

<span class="mw-page-title-main">Detoxification foot baths</span> Pseudoscientific alternative medicine

Detoxification foot baths, also known as foot detox, ionic cleansing, ionic foot bath and aqua/water detox are pseudoscientific alternative medical devices marketed as being able to remove toxins from the human body. They work by providing an electric current to an electrode array immersed in a salt water solution. When switched on, the electrodes rapidly rust in a chemical process called electrolysis which quickly turns the water brown. This reaction happens regardless of whether or not a person's feet are immersed in the water and no toxins from the human body have ever been detected in the water after use.

References

  1. 1 2 3 4 5 6 7 Purtill, James (12 August 2020). "Infrared saunas are not a coronavirus remedy, doctors warn, as sales boom". Triple J Hack. Australian Broadcasting Corporation. Archived from the original on 5 March 2021. Retrieved 21 May 2021.
  2. Kellogg, John Harvey (14 April 1896). "US Patent US558394". United States Patent and Trademark Office. Retrieved 21 May 2021.
  3. Heid, Markham (7 September 2016). "You Asked: Are Infrared Saunas Healthy?". Time. Archived from the original on 7 September 2016. Retrieved 21 May 2021.
  4. 1 2 3 Tsonis, Jack (19 November 2018). "Infrared sauna is no better for your health than traditional sauna: busting a common wellness myth". The Conversation. Archived from the original on 20 November 2018. Retrieved 21 May 2021.
  5. 1 2 3 4 5 6 Beever R (July 2009). "Far-infrared saunas for treatment of cardiovascular risk factors: summary of published evidence". Canadian Family Physician. 55 (7): 691–6. PMC   2718593 . PMID   19602651.
  6. 1 2 3 4 5 Novella, Steven (17 February 2021). "Infrared Saunas for "Detoxification"". Science Based Medicine. Archived from the original on 23 February 2021. Retrieved 21 May 2021.
  7. Källström M, Soveri I, Oldgren J, Laukkanen J, Ichiki T, Tei C, et al. (November 2018). "Effects of sauna bath on heart failure: A systematic review and meta-analysis". Clinical Cardiology. 41 (11): 1491–1501. doi:10.1002/clc.23077. PMC   6489706 . PMID   30239008.
  8. Hussain, Joy (30 July 2019). "People use sauna for well-being, but its medical benefits are not widely understood". The Conversation. Archived from the original on 30 July 2019. Retrieved 21 May 2021.
  9. 1 2 3 Conaboy, Kelly (2 June 2017). "Infrared Saunas Will Not 'Detoxify' You". The Atlantic. Archived from the original on 8 June 2017. Retrieved 21 May 2021.
  10. 1 2 Bellamy, Jann (18 June 2020). "FTC warns naturopaths, acupuncturists, physicians, and chiropractors about false and misleading COVID-19 claims". Science Based Medicine. Archived from the original on 18 June 2020. Retrieved 21 May 2021.
  11. 1 2 Bellamy, Jann (15 September 2016). "NCCIH funds sauna "detoxification" study at naturopathic school". Science Based Medicine. Archived from the original on 17 November 2020. Retrieved 21 May 2021.
  12. Engelhaupt, Erika (7 April 2018). "Fact or Fiction: Can You Really Sweat Out Toxins?". National Geographic. Archived from the original on 17 February 2021. Retrieved 21 May 2021.
  13. Gorski, David (14 May 2012). "Another cancer tragedy in the making". Science Based Medicine. Archived from the original on 22 June 2013. Retrieved 21 May 2021.
  14. Gavura, Scott (20 November 2014). "Naturopathy vs. Science: Autism". Science Based Medicine. Archived from the original on 22 November 2014. Retrieved 21 May 2021.
  15. Weaver, Matthew (24 February 2021). "NHS warns against Gwyneth Paltrow's 'kombucha and kimchi' Covid advice". The Guardian. Archived from the original on 24 February 2021. Retrieved 21 May 2021.