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Cohort study · 2015 · HD-001
40 % lower mortality at 4 to 7 sauna sessions a week versus oneFinnish men who used the sauna four to seven times a week had 40 % lower all-cause mortality than men who already went once a week. 2,315 participants, followed for a median of 20....
Laukkanen T. et al., JAMA Internal Medicine, 2015 / HD-001
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Cohort study · 2018 · HD-002
Lower cardiovascular mortality with each extra weekly sauna session1,688 participants, 51.4 % of them women, average age 63, followed for a median of 15 years. Cardiovascular mortality risk fell linearly with sauna frequency, with no visible thres...
Laukkanen T. et al., BMC Medicine, 2018 / HD-002
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Cohort study · 2017 · HD-003
Frequent sauna use linked to lower risk of developing hypertensionA prospective analysis of men who were normotensive at baseline. Frequent sauna use was associated with a substantially lower risk of developing hypertension over the following two...
Zaccardi F. et al., American Journal of Hypertension, 2017 / HD-003
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Cohort study · 2018 · HD-004
Frequent sauna use linked to lower stroke risk in women and menA prospective cohort study of stroke risk in Finnish men and women. The association held after excluding the first two years of follow-up and after excluding participants with pre-...
Kunutsor S.K. et al., Neurology, 2018 / HD-004
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Cohort study · 2019 · HD-005
More frequent sauna use linked to lower venous thromboembolism riskA short report extending the vascular findings to venous thromboembolism. More frequent sauna use was associated with lower risk. Small event count and no known replication, so thi...
Kunutsor S.K. et al., European Journal of Epidemiology, 2019 / HD-005
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Intervention study · 2018 · HD-006
One 30-minute session: blood pressure and arterial stiffness fellMeasures what happens during and immediately after a single sauna session. Blood pressure fell afterwards and pulse wave velocity, a marker of arterial stiffness, dropped from 9.8...
Laukkanen T. et al., Journal of Human Hypertension, 2018 / HD-006
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Intervention study · 2019 · HD-008
During sauna, blood pressure rose to a load like 100 watts on a bikeBlood pressure does not fall during a sauna session. It rises. Twenty-five minutes of sauna produced a cardiac load comparable to roughly 100 watts on a bike. The drop comes afterw...
Ketelhut S. und Ketelhut R.G., Complementary Therapies in Medicine, 2019 / HD-008
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Cohort study · 2017 · HD-009
66 % lower dementia risk at 4 to 7 sauna sessions a week versus oneMen who used the sauna four to seven times a week had 66 % lower dementia risk and 65 % lower Alzheimer's risk than men who went once a week. Adjusted for nine confounders.
Laukkanen T. et al., Age and Ageing, 2017 / HD-009
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Intervention study · 2013 · HD-011
Hyperthermia device, not sauna: open pilot in depression, no controlAn open pilot study in 16 adults with depression, without a control group. Historically the starting point for all heat-and-mood research. Worth knowing as background, never as evi...
Hanusch K.-U. et al., American Journal of Psychiatry, 2013 / HD-011
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Randomised controlled trial · 2016 · HD-012
One hyperthermia session, not sauna: lower depression scores than shamRandomised, double-blind and sham-controlled. Core temperature was raised to 38.5 degrees in 16 participants while 14 received a convincing sham. Depression scores stayed lower for...
Janssen C.W. et al., JAMA Psychiatry, 2016 / HD-012
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Randomised controlled trial · 2025 · HD-013
Infrared heat plus CBT, not sauna: a feasibility trial in depressionThirty adults with depression completed eight weeks of cognitive behavioural therapy combined with whole-body heat treatment at UCSF. 86.2 % no longer met depression criteria at fo...
Mason A.E. et al., Global Advances in Integrative Medicine and Health, 2025 / HD-013
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Cohort study · 2017 · HD-015
More frequent sauna use linked to lower pneumonia risk in menA prospective cohort analysis of pneumonia risk. More frequent sauna use was associated with lower risk. Superseded in scope by HD-037, which covers a broader respiratory endpoint...
Kunutsor S.K. et al., Respiratory Medicine, 2017 / HD-015
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Intervention study · 2007 · HD-017
Six runners, post-training sauna: 32 % longer time to exhaustionSix male runners, three weeks of post-training sauna, roughly 31 minutes at 89.9 degrees. Time to exhaustion rose 32 % and plasma volume 7.1 %. The most quoted study in this field...
Scoon G.S.M. et al., Journal of Science and Medicine in Sport, 2007 / HD-017
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Intervention study · 2021 · HD-018
Post-training sauna: VO2max up about 8 % versus a control groupTwenty trained middle-distance runners, thirteen of them women, added three sauna sessions a week after training for three weeks. VO2max rose about 8 %, lactate threshold speed abo...
Kirby N.V. et al., European Journal of Applied Physiology, 2021 / HD-018
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Cohort study · 2018 · HD-019
High fitness plus frequent sauna use: lowest mortality risk in cohortHigh cardiorespiratory fitness and frequent sauna use together were associated with the lowest mortality risk in the cohort - lower than either habit on its own.
Kunutsor S.K. et al., Annals of Medicine, 2018 / HD-019
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Cohort study · 2018 · HD-020
High fitness plus frequent sauna use: lowest sudden cardiac death riskExtends the fitness-plus-sauna finding to sudden cardiac death. Men with high fitness and three to seven sessions a week showed the lowest risk in the cohort. Same data as HD-019,...
Laukkanen J.A. et al., Progress in Cardiovascular Diseases, 2018 / HD-020
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Intervention study · 2021 · HD-021
Winter swimmers who also use the sauna showed altered thermoregulationWinter swimmers who combine cold water with sauna two to three times a week showed altered brown fat behaviour and stronger cold-induced thermogenesis than controls. The reference...
Søberg S. et al., Cell Reports Medicine, 2021 / HD-021
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Survey · 2019 · HD-022
Survey of 482 sauna users: why they go differs from the evidence482 sauna users across 29 countries were asked why they go. Detox was named by 83 %. It is among the least supported claims in the field. 83.5 % reported better sleep, typically fo...
Hussain J.N., Greaves R.F. und Cohen M.M., Complementary Therapies in Medicine, 2019 / HD-022
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Review · 2018 · HD-023
Review: sauna use associated with lower vascular and mortality riskThe most comprehensive medical review of sauna bathing available. Covers epidemiology, experiments and mechanisms: endothelial function, arterial stiffness, autonomic balance and l...
Laukkanen J.A., Laukkanen T. und Kunutsor S.K., Mayo Clinic Proceedings, 2018 / HD-023
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Review · 2023 · HD-024
Review: fitness and sauna use together tied to larger risk reductionThe 2023 update, asking whether combining sauna with other lifestyle factors adds benefit. High cardiorespiratory fitness plus frequent sauna use was associated with greater risk r...
Kunutsor S.K. und Laukkanen J.A., Mayo Clinic Proceedings, 2023 / HD-024
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Review · 2021 · HD-025
Review frames sauna use as hormesis, a mild stress with adaptationPlaces sauna use inside the concept of hormesis: mild heat stress triggers protective mechanisms that overlap substantially with the response to exercise. Heat shock proteins rise...
Patrick R.P. und Johnson T.L., Experimental Gerontology, 2021 / HD-025
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Systematic review · 2018 · HD-026
40 studies reviewed: mostly favourable, but many claims unsupportedA systematic review of 40 clinical studies with 3,855 participants, assessed for risk of bias. Mostly favourable direction, uneven quality. The authors state explicitly that detox,...
Hussain J. und Cohen M., Evidence-Based Complementary and Alternative Medicine, 2018 / HD-026
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Review · 2001 · HD-027
Safety reference: contraindications, risk groups and alcoholThe reference paper on contraindications, risk groups and the interaction between alcohol and heat. Older than every cohort finding, but the risk section is still cited in almost e...
Hannuksela M.L. und Ellahham S., The American Journal of Medicine, 2001 / HD-027
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Review · 2006 · HD-028
Finnish review separates acute sauna responses from adaptationA Finnish review separating acute responses from adaptations to repeated exposure. Covers circulation, endocrine response and thermoregulation. The physiological section remains va...
Kukkonen-Harjula K. und Kauppinen K., International Journal of Circumpolar Health, 2006 / HD-028
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Review · 2015 · HD-029
German review: sauna's preventive potential is largely untappedThe central German-language review on sauna and prevention, written by a physician who has published on the subject since 1979. Covers infection resilience, cardiovascular preventi...
Brenke R., Forschende Komplementärmedizin, 2015 / HD-029
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Review · 2017 · HD-030
German review on sauna and musculoskeletal complaintsA German-language review of the evidence for musculoskeletal complaints: osteoarthritis, fibromyalgia and rheumatic disease. Several of the cited primary studies date from the 1960...
Brenke R., Zeitschrift für Komplementärmedizin, 2017 / HD-030
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Cohort study · 2017 · HD-037
41 % lower respiratory disease risk at 4 or more sessions a weekMen with four or more sauna sessions a week had 41 % lower risk of respiratory disease than men with at most one. Two to three sessions gave 27 %. 1,935 men, median 25.6 years.
Kunutsor S.K., Laukkanen T. und Laukkanen J.A., European Journal of Epidemiology, 2017 / HD-037
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Intervention study · 1990 · HD-038
Regular sauna users caught fewer colds than non-users over six monthsTwenty-five people used the sauna regularly, twenty-five avoided it entirely. Over six months the sauna group caught roughly half as many colds. Duration and severity did not diffe...
Ernst E., Pecho E., Wirz P. und Saradeth T., Annals of Medicine, 1990 / HD-038
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Cohort study · 2019 · HD-039
Sauna frequency showed no association with cancer risk either way2,173 men, 24 years, 588 cancer cases. Sauna frequency showed no association with cancer risk in either direction. The same group that published the positive findings published thi...
Laukkanen J.A. et al., European Journal of Cancer, 2019 / HD-039
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Randomised controlled trial · 2016 · HD-040
Hot water immersion, not sauna: vessel markers improved versus shamEight weeks of repeated hot water immersion nearly doubled flow-mediated dilation, from 5.6 % to 10.9 %. The sham group sat in thermoneutral water and showed none of it.
Brunt V.E. et al., The Journal of Physiology, 2016 / HD-040
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Intervention study · 1986 · HD-041
The 16-fold growth hormone spike came from 14 hours of heat a weekThe famous sixteen-fold growth hormone spike came from a protocol of one hour at 80 degrees, twice a day, for seven consecutive days. The response was already declining by day thre...
Leppäluoto J. et al., Acta Physiologica Scandinavica, 1986 / HD-041
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Cohort study · 2021 · HD-042
High fitness plus frequent sauna use: 38 % lower pneumonia riskFitness alone: not statistically significant. Sauna alone: not statistically significant. Both together: 38 % lower pneumonia risk. 529 cases over a median of 26.6 years.
Kunutsor S.K., Jae S.Y. und Laukkanen J.A., European Journal of Clinical Investigation, 2021 / HD-042
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Intervention study · 2019 · HD-043
Local diathermy, not sauna: heat preserved muscle mitochondriaTen days of leg immobilisation destroys mitochondrial capacity. Daily heat treatment prevented that loss entirely and reduced muscle wasting. The sham-treated condition showed the...
Hafen P.S. et al., Journal of Applied Physiology, 2019 / HD-043
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Intervention study · 1986 · HD-044
Heat as graded load: noradrenaline up 100 to 310 % from baselineNoradrenaline rose by 100 % at 80 degrees, 160 % at 100 degrees and 310 % in humid heat carried to subjective exhaustion. Adrenaline did not move at all.
Leppäluoto J. et al., European Journal of Applied Physiology, 1986 / HD-044
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Intervention study · 2000 · HD-045
One hour in 14 degree water: plasma dopamine up 250 %The primary source behind the most quoted number in cold exposure. Young men were immersed head-out for one hour in water at 32, 20 and 14 degrees. At 14 degrees, plasma noradrenal...
Šrámek P. et al., European Journal of Applied Physiology, 2000 / HD-045
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Intervention study · 2026 · HD-046
A cold plunge between sauna bouts lowered strain and heat stimulusSixteen healthy adults, half of them women, completed two 15 min sauna bouts at 85 degrees on two separate visits. In one visit the cooling break was air only, in the other it cont...
Owen T.F. et al., Experimental Physiology, 2026 / HD-046
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Intervention study · 2016 · HD-047
Sauna then cold water: tolerated by stable heart patients under careThirty-seven men around 61 years old went through two Finnish sauna bouts at 80 degrees followed by a head-out immersion in 12 degree water: 12 with chronic heart failure, 13 with...
Radtke T. et al., European Journal of Preventive Cardiology, 2016 / HD-047
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Systematic review · 2013 · HD-048
Contrast water bathing beat passive rest, not other recovery methodsThe evidence base for contrast bathing, pooled. 18 controlled trials, 356 people, cold water at 8 to 15 degrees and hot water at 35.5 to 45 degrees, mostly 1 minute cold against 1...
Bieuzen F., Bleakley C.M. und Costello J.T., PLoS ONE, 2013 / HD-048
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Intervention study · 2015 · HD-049
Cold water right after strength training: gains only with active restThe primary source behind the claim that cold straight after lifting costs you the adaptation. 21 physically active men trained for 12 weeks, 2 days a week, followed each session b...
Roberts L.A. et al., The Journal of Physiology, 2015 / HD-049
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Systematic review · 2025 · HD-050
Cold water, not sauna: inflammation up first, stress down at 12 hoursThe current overall picture for cold water in healthy adults. 11 randomised trials, 3177 people, water at 7 to 15 degrees for 30 seconds to 2 hours. Inflammation rose immediately a...
Cain T. et al., PLOS ONE, 2025 / HD-050
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Review · 2017 · HD-051
Open cold water, not sauna: the main danger is cold shockThe first review across the whole field of cold water immersion, hazard and treatment in one paper. The danger is not hypothermia but cold shock in the opening minutes: a gasp and...
Tipton M.J. et al., Experimental Physiology, 2017 / HD-051
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Systematic review · 2025 · HD-052
Heat after training: performance edge uncertain, certainty lowTen trials, 199 people, 5 to 21 days of sauna or hot water after training, pooled. Performance in the heat came out around 4 % better than in the control groups, with a range from...
Solomon T.P.J. & Laye M.J., BMC Sports Science, Medicine and Rehabilitation, 2025 / HD-052
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Systematic review · 2025 · HD-053
Heat after training: soreness relief found in 1 of 3 trialsFourteen trials, 194 people, whole-body heat above 36 degrees after training against passive or placebo recovery. Only 1 of the 3 trials that measured soreness found relief. Jump h...
Ahokas E.K. et al., Sports Medicine - Open, 2025 / HD-053
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Randomised controlled trial · 2023 · HD-054
Infrared cabin, not sauna, after lifting: less soreness than sittingSixteen male basketball players lifted heavy, then spent 20 minutes in an infrared cabin at 43 degrees or 20 minutes sitting at room temperature. 14 hours later, jump height had dr...
Ahokas E.K. et al., Biology of Sport, 2023 / HD-054
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Intervention study · 2025 · HD-055
Infrared cabin, not sauna, after training added no muscle growthForty female team-sport athletes trained for 6 weeks, half of them with 10 minutes of infrared at 50 degrees after every session, 3 times a week. Thigh muscle cross-section rose in...
Ahokas E.K. et al., Frontiers in Sports and Active Living, 2025 / HD-055
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Intervention study · 2026 · HD-056
Same sauna, two heights: hotter and drier at head level than seatedSensors at 0.90 and 1.73 metres in four Finnish saunas: sitting height averaged 50.8 degrees and 53.8 % humidity, head height 69.0 degrees and 27.7 %. In 50 adults, temperature and...
Laatikainen-Raussi I. et al., Temperature, 2026 / HD-056
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Intervention study · 2024 · HD-057
At 120 degrees, 3 of 22 sauna novices fainted; at 80 degrees, none22 young women with one to three sauna visits in their lives sat 20 minutes at 80 degrees and, a week later, at 120 degrees. Nobody fainted at 80 degrees. At 120 degrees, 3 of 22 l...
Podstawski R. et al., Frontiers in Public Health, 2024 / HD-057
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Review · 2026 · HD-058
The people who study this say the combination is unresolvedA narrative review of what heat and cold each do, and what happens when they are combined. The authors state that it remains uncertain whether combining the two stimuli offers grea...
Douzi W. et al., International Journal of Biometeorology, 2026 / HD-058
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Intervention study · 2025 · HD-059
Three rounds, two minutes in fifteen degrees, twenty-eight womenTwenty-eight healthy women without sauna experience completed three 10 minute bouts at 90 degrees, each followed by a 10 minute cooling break that ended with 2 minutes immersed to...
Szafraniec R. et al., Scientific Reports, 2025 / HD-059
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