Traditional Sauna vs Infrared Sauna Health Benefits: What the Evidence Says
This article compares published evidence and is not medical advice. People with cardiovascular disease, pregnancy, severe hypotension, or chronic health conditions should consult a qualified clinician before starting sauna use of either type.
Traditional sauna has the larger and longer-running evidence base, anchored by Finnish prospective cohort studies linking frequent sauna use to lower cardiovascular disease, all-cause mortality, hypertension, stroke, and dementia incidence. Infrared sauna has a smaller but more condition-specific research base, anchored by Japanese Waon therapy randomized trials in chronic heart failure, chronic fatigue syndrome, and fibromyalgia.
For most healthy users, the practical health benefits—blood pressure response, endothelial function, post-exercise recovery, perceived wellbeing—appear broadly similar across both formats, since the underlying driver is heat-induced cardiovascular and thermoregulatory stress. The choice typically comes down to heat tolerance, installation footprint, power requirements, and which evidence base most closely matches the buyer's reason for using a sauna.
Key Takeaways
- Traditional sauna has the strongest long-term evidence for cardiovascular disease, all-cause mortality, hypertension, stroke, and dementia outcomes, anchored by Finnish KIHD prospective cohort studies followed for 20+ years.
- Infrared sauna has the stronger condition-specific trial evidence via Waon therapy, particularly for chronic heart failure, chronic fatigue syndrome, and fibromyalgia, where standardized 60°C far-infrared protocols have been studied in randomized and controlled designs.
- For general wellness, recovery, blood pressure response, and perceived wellbeing, both formats appear broadly similar in direction and magnitude because both produce sustained cardiovascular heat stress.
- Traditional and infrared sauna studies are not interchangeable: they use different temperatures, session structures, populations, and follow-up durations, so findings transfer mechanistically rather than directly.
- The best sauna choice depends on the user’s goal: long-term population evidence and high heat tolerance favor traditional; moderate heat tolerance, residential installation, and certain clinical protocols favor infrared.
How We Evaluated the Evidence
This comparison weights study designs in the standard hierarchy: large prospective cohort studies and randomized controlled trials carry more weight than single-arm pilot studies, case series, or industry-funded white papers. Where claims are commonly repeated but the supporting research is thin, we say so. Where one sauna format has trial evidence the other does not, we say that too. We did not exclude null findings, and we flag where extrapolation across formats is reasonable versus where it is not. All cited studies are linked in the Sources & References section near the end of this article.
Heat exposure parameters differ meaningfully between formats: traditional Finnish sauna typically operates at 80–100°C (176–212°F) at 10–20% humidity, while infrared cabins typically operate at 45–65°C (113–149°F) and rely on radiant transfer rather than convective heating. We treat findings from one format as suggestive but not interchangeable with the other.
Quick Comparison: Where Each Evidence Base Is Strongest
| Health Outcome | Stronger Evidence For | Notes |
|---|---|---|
| All-cause mortality | Traditional | Finnish KIHD prospective cohort, 2,315 men, 20+ year follow-up. No comparable infrared cohort study identified. |
| Cardiovascular disease incidence | Traditional | Frequency-dose response observed (4–7 sessions/week vs 1/week). Infrared evidence is shorter-duration and smaller. |
| Hypertension risk reduction | Traditional (cohort) / Both (acute response) | Long-term Finnish data favors traditional; acute blood pressure response is documented for both. |
| Stroke incidence | Traditional | KIHD follow-up showed 4–7 sessions/week associated with substantially lower stroke risk in men and women. |
| Dementia and Alzheimer’s risk | Traditional | KIHD follow-up linked frequent sauna use to lower incidence. No infrared cohort data identified. |
| Endothelial / vascular function | Comparable | Both formats show flow-mediated dilation and arterial stiffness improvements in shorter-term studies. |
| Chronic heart failure | Infrared | Waon therapy RCTs (Tei, Kihara, Miyata) used a specifically designed 60°C far-infrared cabin protocol. |
| Chronic fatigue syndrome | Infrared | Japanese Waon therapy trials show symptom improvement; no comparable traditional sauna trials identified. |
| Fibromyalgia and chronic pain | Infrared | Small RCTs (Matsushita and others) show pain and stiffness reduction. Traditional research thinner. |
| Athletic recovery | Comparable | Endurance and recovery markers improve with both. Infrared studies generally shorter and smaller. |
| Mood and perceived wellbeing | Comparable | Acute mood improvements reported across both formats; whole-body hyperthermia trial evidence is early-stage. |
| Detoxification (heavy metals, BPA) | Limited for both | Sweat composition studies exist but clinical-outcome evidence is thin regardless of sauna type. |
| Skin appearance | Limited for both | Sauna heat alone has weak skin evidence; red light therapy is a separate modality with its own research. |
Who Should Choose Each
Traditional sauna wins when
- Long-term cardiovascular and mortality risk reduction is the primary motivation, and the buyer wants the format with decades of cohort data behind it.
- The user prefers high heat (180–200°F) and the option to add steam by ladling water on heated stones.
- Cultural or traditional sauna experience matters for adherence—people use what they enjoy.
- 240V or higher dedicated electrical service is straightforward to install, or a wood-burning stove fits the property.
Infrared sauna wins when
- Heat tolerance is limited, or longer sessions at moderate temperatures (130–150°F) are preferred over shorter, hotter sessions.
- The user has a specific condition with infrared-targeted research—chronic heart failure, chronic fatigue syndrome, fibromyalgia—where Waon therapy protocols apply.
- Indoor residential installation is required, with 120V or standard 240V electrical service and a smaller cabin footprint.
- Integrated features matter: red light therapy, native app control, scheduled preheats, guided breathwork content, chromotherapy.
The Traditional Sauna Evidence Base
The strongest single body of sauna research comes from Finland, where sauna use is culturally widespread and large prospective cohorts have been followed for decades. The Kuopio Ischaemic Heart Disease Risk Factor Study (KIHD), led by Jari Laukkanen and colleagues at the University of Eastern Finland, has produced the most-cited findings in the field.
Following 2,315 middle-aged men over a median of roughly 20 years, the KIHD analyses reported that men who used a sauna 4–7 times per week had substantially lower rates of fatal cardiovascular events, sudden cardiac death, and all-cause mortality compared with men who used a sauna once per week. Subsequent KIHD analyses extended these associations to lower hypertension incidence, lower stroke incidence in middle-aged and older men and women, and lower dementia and Alzheimer’s incidence over follow-up. A frequency-dose response was observed across most outcomes—more sessions per week associated with larger reductions, up to a point. The 2018 BMC Medicine cohort extension also reported similar mortality patterns in a mixed-sex sample of men and women.
What this evidence supports
- Repeated heat exposure delivered consistently over years is associated with meaningful reductions in cardiovascular and neurodegenerative disease risk in the studied population.
- The effect appears dose-dependent on frequency and possibly session length.
- Traditional sauna use is well-tolerated as a long-term lifestyle behavior in a population that grew up using it.
What this evidence does not establish
- Causality. Cohort studies show association, not direct cause-and-effect. Frequent sauna users in Finland may differ from non-users in ways that themselves affect disease risk (income, social participation, baseline fitness, lifestyle), and adjustment can only go so far.
- Generalizability beyond the studied population. Early KIHD analyses enrolled middle-aged Finnish men; later extensions included women but the total non-Finnish evidence base remains small. Whether the same effect sizes apply to people who adopt sauna use later in life rather than from youth remains less certain.
- Equivalence across sauna formats. KIHD participants were almost exclusively using traditional Finnish-style hot saunas. Extrapolation to infrared cabins is plausible mechanistically but is not what the studies actually measured.
Beyond KIHD, smaller traditional-sauna studies have documented acute effects on blood pressure, heart rate variability, and arterial stiffness, with patterns broadly consistent with the cohort findings. The 2018 Mayo Clinic Proceedings review by Laukkanen and colleagues consolidated the evidence to that point, and remains the most cited single summary of traditional sauna’s health-outcome literature.
Traditional sauna’s strongest evidence comes from the Finnish KIHD prospective cohort: roughly 2,315 middle-aged men followed for over 20 years, with frequency-dose reductions in cardiovascular mortality, all-cause mortality, hypertension, stroke, and dementia at 4–7 sauna sessions per week. The 2018 Mayo Clinic Proceedings review consolidates the literature. Key limitations: cohort design (association, not causation), Finnish population, and primarily traditional-sauna exposure—findings transfer mechanistically to infrared but are not directly demonstrated in infrared users.
The Infrared Sauna Evidence Base
The infrared sauna research base is smaller, more recent, and structured differently. Rather than long-running cohort studies, the strongest infrared evidence comes from Japanese clinical trials of Waon therapy—a standardized far-infrared protocol developed at Kagoshima University by Chuwa Tei and colleagues. Waon therapy uses a 60°C (140°F) far-infrared dry sauna for 15 minutes followed by 30 minutes of post-session warm rest under a blanket, typically delivered five days per week in a clinical setting.
Waon therapy randomized and controlled studies have reported improvements in:
- Chronic heart failure. Multiple trials, including Kihara et al. (J Am Coll Cardiol, 2002) and Miyata et al. (J Cardiol, 2008 multicenter prospective study), have shown improvements in cardiac function, exercise tolerance (six-minute walk distance), B-type natriuretic peptide levels, ventricular arrhythmia frequency, and quality-of-life scores in patients with chronic heart failure following Waon therapy programs.
- Endothelial function. Flow-mediated dilation improvements and reductions in arterial stiffness have been reported in patients with cardiovascular risk factors.
- Chronic fatigue syndrome. Pilot trials by Masuda et al. (J Psychosom Res, 2005) and subsequent Japanese groups have reported reductions in fatigue scores and improvements in mood, pain, and sleep in CFS patients.
- Chronic pain and fibromyalgia. Matsushita, Masuda, and Tei (Intern Med, 2008) reported reductions in pain VAS and Fibromyalgia Impact Questionnaire scores after Waon therapy; the effect persisted across the observation period.
Outside the Waon therapy program, smaller infrared sauna studies have looked at cardiovascular risk markers, post-exercise recovery in athletes, hypertension, and rheumatologic conditions. A handful of these are randomized; most are small, short-duration, and lack long-term follow-up.
What this evidence supports
- Standardized infrared protocols can produce measurable physiological and clinical changes in specific patient populations, particularly in cardiovascular and chronic-pain conditions.
- Infrared heat at moderate temperatures (around 60°C / 140°F) is well-tolerated by patients with reduced exercise tolerance, including chronic heart failure patients who would not tolerate high-temperature traditional sauna.
- Infrared sessions can produce cardiovascular responses—heart rate elevation, peripheral vasodilation, blood pressure response—that overlap with traditional sauna in their general direction, even if the absolute magnitudes differ.
What this evidence does not establish
- Long-term mortality outcomes. We did not identify a published long-running prospective cohort study of infrared sauna users on the scale of KIHD.
- Equivalence to traditional sauna for cardiovascular protection at the population level. The mechanisms overlap, but the trial designs and durations are not comparable.
- Distinction between full-spectrum, near-infrared, and far-infrared. Most clinical trials use specific wavelength bands and protocols; consumer infrared cabins vary in spectral output, irradiance, and session structure.
Infrared sauna’s strongest evidence is condition-specific rather than population-wide: Japanese Waon therapy trials at 60°C / 140°F have shown improvements in chronic heart failure (Kihara 2002, Miyata 2008), chronic fatigue syndrome (Masuda 2005), and fibromyalgia (Matsushita 2008). Outside Waon therapy, infrared studies are mostly small and short-duration. No long-running infrared cohort comparable to Finnish KIHD has been published. Wavelength and protocol vary across consumer infrared cabins, so transferability of trial results to home use should be assessed protocol-by-protocol.
Cardiovascular Disease and Blood Pressure
Both sauna formats produce a similar acute physiological response: peripheral vasodilation, modest heart rate elevation, lowered systemic vascular resistance, and a transient drop in blood pressure during and shortly after the session. Repeated exposure over weeks tends to lower resting blood pressure modestly and improve flow-mediated dilation in adults with elevated baseline values.
Where the formats diverge is in long-term outcomes. The KIHD cohort findings on cardiovascular mortality, hypertension incidence, and stroke incidence remain the largest signal in the field, and they were generated in traditional sauna users. Zaccardi et al. (Am J Hypertens, 2017) reported that frequent sauna users had a substantially reduced incidence of new-onset hypertension over a median 24.7 years of follow-up. Infrared trials show consistent direction-of-effect changes in surrogate markers—blood pressure, endothelial function, arterial stiffness—but the trials are too short and too small to speak to mortality. Buyers comparing the two should treat traditional sauna as having the better-supported long-term cardiovascular case and infrared as having a plausible but less mature parallel.
Acute cardiovascular response—vasodilation, heart rate increase, transient blood pressure reduction—is similar across both formats. Long-term hypertension and cardiovascular mortality reduction is better documented for traditional sauna via the KIHD cohort and Zaccardi et al. (Am J Hypertens, 2017). Infrared shows changes in surrogate markers in the same direction but lacks comparable long-term outcome data. For long-horizon cardiovascular risk reduction, traditional has the better-supported case; for short-to-medium-term blood pressure response in tolerable conditions, both formats are reasonable.
Cognitive Function and Dementia Risk
The KIHD cognitive analyses (Laukkanen et al., Age Ageing, 2017) reported that men with the highest sauna frequency had a substantially lower incidence of dementia and Alzheimer’s disease over follow-up compared to men with the lowest frequency. The biological mechanism most often proposed—repeated heat stress driving improvements in cardiovascular health, blood pressure, and possibly heat-shock-protein-mediated cellular repair—is not unique to traditional sauna. But the cohort evidence to date is in traditional sauna only. We did not identify a comparable infrared cohort study.
Chronic Heart Failure
This is the area where infrared sauna has the strongest condition-specific evidence and traditional sauna has comparatively little. Waon therapy was developed in Japan precisely because traditional high-temperature sauna is poorly tolerated in patients with severely reduced exercise tolerance, while a 60°C far-infrared cabin is generally tolerable. Multiple randomized and controlled trials in chronic heart failure patients have reported improvements in left ventricular function, exercise capacity (six-minute walk distance), B-type natriuretic peptide levels, ventricular arrhythmia frequency, and patient-reported quality of life. Kihara et al. (J Am Coll Cardiol, 2002) demonstrated improvements in vascular endothelial and cardiac function; the Miyata et al. (J Cardiol, 2008) prospective multicenter study reported reductions in BNP and improvements in flow-mediated dilation.
Buyers and clinicians considering sauna use as a cardiac rehabilitation adjunct should treat Waon therapy as a specifically validated protocol—60°C, 15 minutes in-cabin, 30 minutes warm rest, five days per week—rather than as a generic claim transferable to any infrared cabin or any session length. That said, modern home far-infrared cabins can closely approximate the Waon temperature and dwell parameters, which is part of why this category of clinical evidence is taken seriously.
Chronic heart failure is the clearest area where infrared sauna research outweighs traditional sauna research, anchored by the Japanese Waon therapy program (60°C far-infrared, 15 minutes, plus 30 minutes warm rest). Kihara et al. (JACC, 2002) and Miyata et al. (J Cardiol, 2008) reported improvements in cardiac function, exercise capacity, BNP, and quality of life. Patients exploring sauna as cardiac rehabilitation should treat the Waon protocol as the studied intervention—not generic infrared use—and should coordinate with their treating clinician.
Chronic Fatigue Syndrome and Chronic Pain
Pilot studies and small randomized trials, primarily from Japanese research groups, have reported symptom improvements in chronic fatigue syndrome (myalgic encephalomyelitis) and fibromyalgia patients undergoing repeated far-infrared sessions. Masuda et al. (J Psychosom Res, 2005) reported substantial improvements in fatigue, pain, sleep disturbance, and low-grade fever in CFS patients undergoing repeated 60°C far-infrared thermal therapy. Matsushita et al. (Intern Med, 2008) reported reductions in pain VAS and Fibromyalgia Impact Questionnaire scores in 13 female fibromyalgia patients, with improvements maintained across the observation period.
Sample sizes are small, follow-up is generally limited, and replication outside the originating research groups is incomplete. Patients considering infrared for these conditions should view the evidence as suggestive rather than definitive, and should coordinate with their treating clinician. For these conditions, the evidence balance favors infrared simply because that is where the research has been done—we did not identify equivalent traditional sauna trials in CFS or fibromyalgia.
Athletic Recovery and Performance
Both formats show similar effects on post-exercise recovery markers: reduced perceived muscle soreness, modest improvements in subsequent endurance performance, and changes in plasma volume and heat-shock protein expression with repeated heat acclimation. Scoon et al. (J Sci Med Sport, 2007) reported that competitive male runners who added post-training sauna sessions over three weeks showed measurable improvements in time-to-exhaustion, attributed primarily to plasma volume expansion. Traditional sauna heat acclimation has a longer history in athletic preparation, particularly for events in hot conditions; infrared sessions have been studied for similar purposes in smaller samples.
For most recreational and competitive athletes, either format is reasonable. The choice typically comes down to which one the athlete will actually use consistently—sustainable adherence outweighs marginal physiological differences.
Mood, Stress, and Mental Health
Acute mood improvement is one of the most consistently reported subjective effects of sauna use, regardless of format. Mechanisms proposed include parasympathetic rebound after heat-induced sympathetic activation, endorphin release, and improvements in sleep architecture downstream of evening sessions. Janssen et al. (JAMA Psychiatry, 2016) reported a randomized, sham-controlled trial of whole-body hyperthermia for major depressive disorder, with reductions in Hamilton Depression Rating Scale scores observed in the active group across the six-week post-intervention period. The trial used a specific water-filtered infrared device rather than consumer sauna equipment, and replication is ongoing.
For stress reduction and general wellbeing, the evidence base is comparable across formats and is dominated by short-term self-report studies. Buyers should not over-index on study volume here—adherence and personal preference matter more than which format has slightly more papers on perceived wellbeing.
Detoxification
"Detoxification" is among the most commonly marketed sauna benefits and one of the least well-supported by clinical-outcome evidence—true for both formats. The Genuis et al. Blood, Urine, and Sweat (BUS) studies (Arch Environ Contam Toxicol, 2011; J Environ Public Health, 2012) documented detectable concentrations of heavy metals and bisphenol A in sweat from study participants, sometimes at levels exceeding what was measured in matched blood or urine samples. What these studies have not established is whether the elimination meaningfully changes circulating body burdens or downstream health outcomes, since the kidneys and liver are the dominant clearance routes for most relevant compounds.
Readers interested in this topic should treat sauna sweating as a plausible minor accessory route of elimination rather than a primary detoxification mechanism, and should be skeptical of marketing claims that promise specific clinical outcomes from sweating alone. Buyers should verify the source of any cited "detox" study—some commonly referenced sweat-composition findings are observational and do not establish clinical endpoints.
Detox claims are limited for both sauna formats. The Genuis BUS studies (2011, 2012) documented heavy metals and BPA in sweat—sometimes at higher concentrations than in matched blood or urine—but did not establish that this meaningfully reduces total body burden or improves clinical outcomes. The kidneys and liver remain the dominant clearance routes for most relevant compounds. Treat sauna sweating as a plausible minor accessory pathway, not a primary detoxification mechanism, regardless of which sauna format is used.
Skin Health
Heat alone has limited published evidence for skin benefits beyond improved superficial blood flow and a transient appearance of hydration. Where infrared sauna brands cite skin research, the underlying studies are usually red light therapy studies—a different modality operating at specific visible (around 660nm red light) and near-infrared (around 850nm near-infrared) wavelengths at therapeutic irradiances, not heat-driven infrared. The two are commonly conflated in marketing.
For readers interested in skin outcomes specifically, the evidence sits with red light therapy as a separate and more directly studied modality. Some current-generation premium infrared saunas—including the factory-integrated red light therapy on the Sun Home Eclipse 2P, Eclipse 4P, and Pod—combine both heat-driven infrared and 660nm red light plus 850nm near-infrared therapy in the same cabin, which lets users address both objectives in one session without conflating them.
Practical Considerations Beyond the Research
Heat tolerance and session adherence
The most important variable in sauna outcomes is whether the user actually uses it. Traditional sauna at 180–200°F is intense and short (typically 8–15 minutes per round). Infrared at 130–150°F is gentler and longer (typically 30–45 minutes). Heat-tolerant users often prefer the traditional format; heat-sensitive users, older adults, and patients with reduced exercise tolerance often find infrared more sustainable. Adherence is the silent variable in every cohort and trial.
Installation and power requirements
Traditional saunas typically require a dedicated 240V circuit and a heater rated for the cabin volume, plus appropriate ventilation. Infrared saunas commonly run on 120V or 240V depending on size and design—the Sun Home Equinox 3 runs on 120V/20A, while larger Luminar models are 240V. Outdoor installation, weatherproofing, and clearance requirements differ as well.
Verifiable build-quality evidence
Independent of the clinical research base, buyers should look at brand-level testing transparency: is EMF emission published with named-lab testing? Is VOC off-gassing tested by an accredited lab and published? Are temperature consistency and heater longevity verified by third parties? These are not health-outcome questions in the trial sense, but they are quality questions that affect what the buyer is actually exposed to during use. Sun Home publishes VOC testing performed by VERT Environmental in San Diego (April 2026, EPA TO-15 method, 27 µg/m³ total VOC, "low" classification) and EMF testing performed by Vitatech Electromagnetics (0.5 mG seated position, January 2025).
What We Still Don’t Know
- Long-term infrared cohort outcomes. A multi-decade prospective infrared sauna cohort comparable to KIHD does not exist in the published literature we reviewed. Whether the cardiovascular and neurodegenerative findings transfer at the same effect sizes is mechanistically plausible but not directly demonstrated.
- Optimal frequency and session structure for each format. The KIHD frequency-dose data is observational and was not designed to identify a minimum effective dose. Waon therapy uses a fixed five-day protocol; whether two or three sessions weekly produces comparable cardiac benefit in heart failure patients is not fully resolved.
- Wavelength specificity within infrared. Far-infrared, mid-infrared, and near-infrared have different absorption and tissue-penetration profiles. Most clinical trials use far-infrared. Whether full-spectrum cabins produce equivalent outcomes is studied less.
- Standardized comparison studies. Direct head-to-head trials randomizing participants to traditional versus infrared sauna over months and measuring matched cardiovascular endpoints are scarce. Most of what we have is parallel literature, not comparative literature.
- Effects in women and non-Finnish populations. Cohort findings have been replicated to a lesser extent in mixed-sex Finnish samples and other populations, but the largest dataset remains middle-aged Finnish men.
Sun Home’s Position on the Evidence
Sun Home Saunas offers infrared, full-spectrum, and traditional sauna configurations with independently published EMF and VOC testing, third-party heat verification, and US-based warranty support. Our editorial position on the research is the same one we apply to product claims: we do not concede health benefits to the format with the most marketing volume, and we do not overstate the format with the most published research. Traditional sauna has earned the cardiovascular and mortality cohort evidence. Infrared has earned the chronic-condition trial evidence. Most people will be well served by either format; the right choice depends on which evidence base maps to their goals, and on which format they will actually use four-plus times a week for years.
Bottom Line
Traditional sauna and infrared sauna are not interchangeable in their research bases, but they are largely complementary in what they cover. Traditional sauna owns the long-running cardiovascular, mortality, stroke, hypertension, and dementia cohort evidence anchored by the Finnish KIHD studies and the 2018 Mayo Clinic Proceedings review. Infrared sauna owns the condition-specific clinical trial evidence in chronic heart failure, chronic fatigue, and chronic pain via the Japanese Waon therapy program. The mechanisms overlap; the trial designs do not. For most buyers, the right framing is not "which sauna has more research" but "which evidence base most closely matches my reason for using one"—along with the practical fit of heat tolerance, installation, power, and which format produces consistent use over years.
Traditional sauna leads on long-term population evidence (cardiovascular mortality, all-cause mortality, hypertension, stroke, dementia) anchored by the Finnish KIHD cohort. Infrared sauna leads on condition-specific clinical trial evidence (chronic heart failure, chronic fatigue syndrome, fibromyalgia) anchored by Japanese Waon therapy. For general wellness, both formats produce broadly similar effects via shared heat-stress mechanisms. The right choice maps to the user’s goal, heat tolerance, installation constraints, and which format will actually be used consistently over years.
Sources & References
- Laukkanen T, Khan H, Zaccardi F, Laukkanen JA. Association between sauna bathing and fatal cardiovascular and all-cause mortality events. JAMA Intern Med. 2015;175(4):542-548. jamanetwork.com · doi:10.1001/jamainternmed.2014.8187
- Laukkanen T, Kunutsor SK, Khan H, Willeit P, Zaccardi F, Laukkanen JA. Sauna bathing is associated with reduced cardiovascular mortality and improves risk prediction in men and women: a prospective cohort study. BMC Med. 2018;16(1):219. bmcmedicine.biomedcentral.com · doi:10.1186/s12916-018-1198-0
- Zaccardi F, Laukkanen T, Willeit P, Kunutsor SK, Kauhanen J, Laukkanen JA. Sauna Bathing and Incident Hypertension: A Prospective Cohort Study. Am J Hypertens. 2017;30(11):1120-1125. academic.oup.com · doi:10.1093/ajh/hpx102
- Laukkanen T, Kunutsor S, Kauhanen J, Laukkanen JA. Sauna bathing is inversely associated with dementia and Alzheimer’s disease in middle-aged Finnish men. Age Ageing. 2017;46(2):245-249. academic.oup.com · doi:10.1093/ageing/afw212
- Kunutsor SK, Khan H, Zaccardi F, Laukkanen T, Willeit P, Laukkanen JA. Sauna bathing reduces the risk of stroke in Finnish men and women: A prospective cohort study. Neurology. 2018;90(22):e1937-e1944. neurology.org · doi:10.1212/WNL.0000000000005606
- Laukkanen JA, Laukkanen T, Kunutsor SK. Cardiovascular and Other Health Benefits of Sauna Bathing: A Review of the Evidence. Mayo Clin Proc. 2018;93(8):1111-1121. mayoclinicproceedings.org · doi:10.1016/j.mayocp.2018.04.008
- Kihara T, Biro S, Imamura M, Yoshifuku S, Takasaki K, Ikeda Y, Otuji Y, Minagoe S, Toyama Y, Tei C. Repeated sauna treatment improves vascular endothelial and cardiac function in patients with chronic heart failure. J Am Coll Cardiol. 2002;39(5):754-759. jacc.org · doi:10.1016/s0735-1097(01)01824-1
- Miyata M, Kihara T, Kubozono T, Ikeda Y, Shinsato T, Izumi T, Matsuzaki M, Yamaguchi T, Kasanuki H, Daida H, Nagayama M, Nishigami K, Hirata K, Kihara K, Tei C. Beneficial effects of Waon therapy on patients with chronic heart failure: results of a prospective multicenter study. J Cardiol. 2008;52(2):79-85. journal-of-cardiology.com
- Masuda A, Kihara T, Fukudome T, Shinsato T, Minagoe S, Tei C. The effects of repeated thermal therapy for two patients with chronic fatigue syndrome. J Psychosom Res. 2005;58(4):383-387. pubmed.ncbi.nlm.nih.gov · doi:10.1016/j.jpsychores.2004.11.005
- Matsushita K, Masuda A, Tei C. Efficacy of Waon therapy for fibromyalgia. Intern Med. 2008;47(16):1473-1476. jstage.jst.go.jp · doi:10.2169/internalmedicine.47.1054
- Scoon GS, Hopkins WG, Mayhew S, Cotter JD. Effect of post-exercise sauna bathing on the endurance performance of competitive male runners. J Sci Med Sport. 2007;10(4):259-262. pubmed.ncbi.nlm.nih.gov
- Genuis SJ, Birkholz D, Rodushkin I, Beesoon S. Blood, Urine, and Sweat (BUS) Study: Monitoring and Elimination of Bioaccumulated Toxic Elements. Arch Environ Contam Toxicol. 2011;61(2):344-357. link.springer.com · doi:10.1007/s00244-010-9611-5
- Genuis SJ, Beesoon S, Birkholz D, Lobo RA. Human Excretion of Bisphenol A: Blood, Urine, and Sweat (BUS) Study. J Environ Public Health. 2012;2012:185731. pmc.ncbi.nlm.nih.gov · doi:10.1155/2012/185731
- Janssen CW, Lowry CA, Mehl MR, Allen JJ, Kelly KL, Gartner DE, Medrano A, Begay TK, Rentscher K, White JJ, Fridman A, Roberts LJ, Robbins ML, Hanusch KU, Cole SP, Raison CL. Whole-Body Hyperthermia for the Treatment of Major Depressive Disorder: A Randomized Clinical Trial. JAMA Psychiatry. 2016;73(8):789-795. jamanetwork.com · doi:10.1001/jamapsychiatry.2016.1031
FAQs
Which sauna type has more research behind it?
Traditional sauna has the larger overall body of research, primarily because of long-running Finnish prospective cohort studies (most notably KIHD) following thousands of participants for decades. Infrared sauna has fewer total publications but more condition-specific randomized trials, particularly in chronic heart failure, chronic fatigue syndrome, and fibromyalgia via the Japanese Waon therapy program.
Does infrared sauna lower blood pressure as effectively as traditional sauna?
Both sauna types produce acute blood pressure reductions through peripheral vasodilation, and short- to medium-term studies show modest resting blood pressure improvements with regular use of either format. Long-term hypertension incidence data is stronger for traditional sauna due to the Finnish KIHD cohort. For practical home use, either format can contribute to blood pressure management, ideally as a complement to—not a replacement for—clinically directed treatment.
Are the cardiovascular benefits of traditional and infrared saunas the same?
The acute cardiovascular response—heart rate elevation, vasodilation, transient blood pressure drop—is broadly similar across both formats, since both involve heat stress that the cardiovascular system responds to. The long-term cardiovascular outcome evidence is stronger for traditional sauna because of the Finnish cohort data; infrared has shorter trials showing changes in surrogate markers in the same direction, but no equivalent multi-decade mortality dataset.
Is infrared sauna safer than traditional sauna?
Neither format has a strong adverse-event signal in healthy users when standard precautions are followed (hydration, session-length limits, avoiding alcohol use beforehand). Infrared’s lower operating temperature is generally better tolerated by people with reduced exercise tolerance, certain cardiovascular conditions, or low heat tolerance. People with active cardiovascular disease, pregnancy, severe hypotension, or a history of fainting should consult a clinician before either format, regardless of marketing claims.
Can infrared sauna replicate the Finnish sauna cohort findings?
Possibly, mechanistically, but not yet demonstrated directly. The Finnish cohort findings come from traditional high-temperature sauna users followed for decades. The proposed biological mechanisms—repeated cardiovascular heat stress, improvements in blood pressure and endothelial function, possibly heat-shock-protein responses—are not unique to traditional sauna and could plausibly be triggered by sufficient infrared exposure. Whether the effect sizes transfer is an open empirical question.
What is Waon therapy and why is it relevant to infrared sauna research?
Waon therapy is a standardized far-infrared sauna protocol developed at Kagoshima University in Japan: 60°C (140°F) far-infrared cabin for 15 minutes, followed by 30 minutes of warm rest under blankets, typically delivered five days per week. It has produced the strongest condition-specific clinical evidence in the infrared category, particularly in chronic heart failure, where it has been studied as an adjunct cardiac rehabilitation intervention. When people refer to "infrared sauna research," much of the most-cited work is Waon therapy research from Tei, Kihara, Miyata, and Masuda.
Which sauna is better for athletic recovery?
The athletic recovery and heat acclimation evidence is comparable across both formats. Endurance-focused athletes have used both for heat preparation and post-training recovery, with documented improvements in plasma volume, heat-shock protein expression, and time-to-exhaustion in some studies, including Scoon et al. (J Sci Med Sport, 2007) in competitive male runners. The practical choice usually comes down to session length tolerance and which format the athlete will use consistently.
Does sauna use actually detoxify the body?
Sweat does contain measurable amounts of heavy metals, BPA, phthalates, and some other compounds, and this is true for both sauna formats per the Genuis BUS studies (2011, 2012). What the published evidence does not clearly show is that sauna-induced sweating meaningfully reduces total body burden of these compounds or produces measurable downstream health outcomes—the kidneys and liver dominate clearance for most relevant substances. We treat detox claims as plausible accessory effects rather than primary mechanisms, and we recommend skepticism toward marketing that promises specific clinical detox outcomes.
Can both sauna types reduce dementia risk?
The published evidence for reduced dementia incidence with frequent sauna use is from the Finnish KIHD cohort (Laukkanen et al., Age Ageing, 2017) and applies to traditional sauna users. The mechanisms proposed—cardiovascular health improvements, blood pressure reduction, and repeated heat-stress responses—are not exclusive to traditional sauna and could plausibly extend to infrared. Direct cohort evidence in infrared sauna users is not currently available at the same scale.
How often should I use a sauna for health benefits?
The Finnish cohort frequency-dose pattern suggested 4–7 sessions per week for the largest cardiovascular and mortality associations, though 2–3 sessions per week was still associated with meaningful reductions versus once weekly. Waon therapy infrared research used a fixed five-day-per-week protocol. For many healthy adults, 3–5 sessions per week of either format is a common practical target, with adherence over years mattering more than any single optimal frequency.
What temperature is best for sauna health benefits?
Traditional sauna research is largely from cabins operating at 80–100°C (176–212°F). Waon therapy infrared research uses 60°C (140°F). Most modern infrared cabins, including current-generation premium models, can reach 165–170°F, which exceeds Waon temperature. The "best" temperature is the one the user can sustain for an effective session length without undue discomfort or session-skipping.
Should I choose traditional or infrared sauna?
If long-term cardiovascular and dementia risk reduction is the priority and high heat is well-tolerated, traditional sauna has the better-documented long-term case. If heat tolerance is moderate, the use case is a specific condition with infrared trial evidence (chronic heart failure, chronic fatigue syndrome, chronic pain), or installation constraints favor a smaller indoor cabin with standard residential power, infrared is the better-fitted format. For most healthy adults using sauna for general wellbeing, either format works—adherence over years is the variable that matters most.
