Sauna and the Heart: How Often Is Healthy?
Finnish long-term data show a remarkable association between frequent sauna bathing and cardiovascular risk. Here is what the numbers say, where they reach their limits and when caution is needed.
The sauna is usually sold as wellness. In the Finnish data it looks more like circulatory training while sitting down. Only both views together give an honest picture: relaxing, probably helpful, and for a few people not harmless for exactly that reason.
You are sitting on the wooden bench, the thermometer reads eighty degrees, your heart beats faster, and somewhere in your head this sentence appears: is this actually good for me? Or am I asking too much of my heart right now?
I get this question often. Mostly not from people who are ill. Rather from people who have heard something. About the Finland study. About the four to seven sauna sessions per week. About the number circulating online that supposedly changes everything.
The number really exists. It is better documented than most wellness promises will ever be. And it is still easy to misunderstand if nobody explains how it came about and for whom it does not apply.
What to expect in this article
- What happens in your circulation while you sit in the heat
- The Kuopio data: who was studied, for how long, with what result
- The dose question: frequency and duration in detail
- The four KPNI lenses on the heat stimulus
- Why observational studies are not proof of cause
- Clear contraindications in existing heart disease
- Diuretics, beta blockers, blood pressure medication and what they change
- Three levers you can put into practice this week
A blood pressure that does not feel dramatic
Before we go into the numbers, here is a pattern I see very often. Anonymised and partly composited, so that nobody can recognise a specific person in it.
“I am supposed to exercise. But in the evening I have no energy left for it.”
Imagine a man in his mid forties. Office job, two children, a lot of sitting, little movement. At the check-up, his family doctor repeatedly measures readings around 145 over 90. Not an emergency. But no longer harmless either.
He gets the advice that almost everyone gets: move more, less salt, lose weight. He tries. He fails. Not for lack of insight, but because of the exhaustion after the working day.
What we looked at together was not only the blood pressure. It was also the sleep, the amount he drank, the stress pattern in the afternoon and the question of which form of recovery actually fits into his life. He came up with the sauna himself, because his sports club had one and he was there twice a week anyway.
We did not discuss this as a replacement for exercise, but as an entry point. Two sessions after swimming, later three evenings per week. After some months his readings were on average lower, and he described being better able to switch off in the evening.
I cannot claim causality, this is a single case and does not prove cause and effect, but I do document the temporal association. In parallel he had been drinking more, swimming more often and going to bed earlier. Which of these contributed what, I cannot separate out.
The lesson: the sauna can be a door opener for people to whom the classic exercise advice currently seems out of reach.
Most people think of recovery when they think of the sauna. Physiologically it is closer to a moderate effort than to a nap. Heart rate rises, the vessels widen, cardiac output increases.
That is the good news for people with little time. And exactly the reason why a diseased heart does not always tolerate this stimulus.
What happens in your body while you sit in the heat for 15 minutes
Imagine your vascular system as an irrigation system with many small valves. In the heat, the body opens all the valves that lead to the skin. Why? Because blood at the skin surface can release heat.
That has consequences which carry through the whole circulation.
The skin vessels widen
A large part of the blood volume shifts outwards. Vascular resistance in the body drops, and blood pressure tends to fall.
The heart compensates
So that enough blood still reaches the body, the heart beats faster. The review in Mayo Clinic Proceedings describes heart rates that can rise considerably during a typical sauna session.
You lose fluid
Water leaves the body through sweat, together with sodium and other electrolytes. Blood volume drops if you do not drink to replace it.
Standing up is the critical moment
Wide vessels plus less volume plus gravity: this is exactly where the dizziness comes from that many people know. In some people that is harmless. In others it is not.
The recovery phase is part of the stimulus
After the sauna session, blood pressure stays lower than before for a while. In this phase the body practises keeping its vascular regulation flexible.
A Finnish research group around Laukkanen studied 102 people with at least one cardiovascular risk factor, average age around 52 years. All of them completed a single sauna session of 30 minutes at 73 degrees.
Measurements were taken before the sauna, directly afterwards and after 30 minutes of recovery. Pulse wave velocity, a measure of arterial stiffness, fell on average from 9.8 to 8.6 metres per second. Systolic blood pressure fell from 137 to 130 mmHg, diastolic from 82 to 75 mmHg. The systolic value remained below the baseline value even after the recovery phase.
What this may mean for you: the effect is real and measurable. But it is initially an acute effect. Whether it turns into a lasting change depends on repetition.
Laukkanen T et al., Journal of Human Hypertension, 2018. DOI: 10.1038/s41371-017-0008-zThe four KPNI lenses on the heat stimulus
In clinical psychoneuroimmunology we do not look at one organ alone, but at four interwoven systems. With heat this is particularly vivid, because all four respond at the same time.
Nervous system
Sympathetic activity rises during the heat, afterwards the parasympathetic side takes over. This swinging movement might train autonomic flexibility. In people with very unstable circulatory regulation, however, the same stimulus can lead to dizziness or a tendency to faint.
Immune system
In an analysis of 2,084 men without acute inflammation, the Finnish group found an association between more frequent sauna bathing and lower C-reactive protein. Low-grade inflammation is regarded as one of the drivers of vascular ageing.
Metabolism
Heat stress can trigger the formation of heat shock proteins. These proteins help cells keep other proteins stable. The link to vascular health is mechanistically plausible, but in humans it is not yet conclusively established.
Hormonal system
Stress hormones rise briefly, followed by a pronounced phase of relaxation. This pattern resembles what we know from measured physical effort: a stimulus, then recovery, then adaptation.
And now you know why the same cabin can be a training stimulus for one person and too much for another.
The Finnish data: 2,315 men, followed for over twenty years
Almost everything that is told today about the sauna and the heart comes from a single source: the Kuopio Ischaemic Heart Disease Risk Factor Study, KIHD for short. A population sample from eastern Finland, examined from 1984 onwards and followed up ever since.
That is first of all a strength. Such long observation periods are rare. It is at the same time a weakness, because many of the well known sauna findings come from the same group of people. So they are not as independent of each other as the number of publications might suggest.
Laukkanen and colleagues analysed 2,315 men aged 42 to 60 years. At the start they had reported how often and how long they went to the sauna. After that, over a median of 20.7 years, it was recorded who died and of what.
601 men went to the sauna once per week, 1,513 went two to three times, and 201 went four to seven times. Compared with the group with one session per week, the hazard ratio for sudden cardiac death was 0.78 (95 percent confidence interval 0.57 to 1.07) at two to three sessions and 0.37 (0.18 to 0.75) at four to seven sessions. Similar associations appeared for fatal coronary events, fatal cardiovascular events and all-cause mortality.
What this may mean for you: the association is clear and points in one direction. At the same time it hangs on a very small group of only 201 men.
Laukkanen T, Khan H, Zaccardi F, Laukkanen JA. JAMA Internal Medicine, 2015. DOI: 10.1001/jamainternmed.2014.8187A frequent objection was: those were only men. That is why the follow-up study matters.
In a second analysis, 1,688 people with a mean age of 63 years were followed, 51.4 percent of them women. Over a median of 15.0 years, 181 fatal cardiovascular events occurred.
Compared with one sauna session per week, the hazard ratios after adjustment for established risk factors were 0.75 (0.52 to 1.08) for two to three sessions and 0.23 (0.08 to 0.65) for four to seven sessions. It was also notable that adding sauna frequency to a risk model measurably improved its predictive performance.
What this may mean for you: the association is not limited to men. The confidence intervals are wide, however, which points to few events in the high frequency group.
Laukkanen T, Kunutsor SK, Khan H, Willeit P, Zaccardi F, Laukkanen JA. BMC Medicine, 2018. DOI: 10.1186/s12916-018-1198-0Blood pressure, stroke and memory
The research group examined the same cohort for several endpoints. Three results are especially relevant for the heart and the vessels.
Zaccardi and colleagues followed 1,621 men who did not have high blood pressure at baseline. Over a median of 24.7 years, 251 of them developed hypertension.
Compared with one sauna session per week, the hazard ratio was 0.76 (0.57 to 1.02) at two to three sessions and 0.54 (0.32 to 0.91) at four to seven sessions. After additional adjustment for alcohol, heart rate, family history, socioeconomic status and cardiorespiratory fitness, the association persisted.
What this may mean for you: a lower blood pressure could be one of the routes through which regular sauna bathing is linked to fewer cardiovascular events.
Zaccardi F et al., American Journal of Hypertension, 2017. DOI: 10.1093/ajh/hpx102Kunutsor and colleagues studied 1,628 men and women aged 53 to 74 years with no known history of stroke. Over 14.9 years, 155 strokes occurred.
At four to seven sauna sessions per week, the hazard ratio after adjustment for established risk factors was 0.39 (0.18 to 0.84), and after additional adjustment for physical activity and socioeconomic status 0.38 (0.18 to 0.81). For ischaemic stroke the picture was similar, for haemorrhagic stroke it was weaker because there were only 34 events.
What this may mean for you: here too the dose direction shows up. And here too the number of events in the high frequency group is small.
Kunutsor SK et al., Neurology, 2018. DOI: 10.1212/WNL.0000000000005606One side finding belongs here, because it shows how far vascular health reaches. The same cohort produced hazard ratios for dementia and Alzheimer's disease at four to seven sessions per week of 0.34 (0.16 to 0.71) and 0.35 (0.14 to 0.90) respectively. Vessels in the brain are, after all, vessels too.
“What connects the heart and the head is not mysticism. It is the same system of pipes.”
Shukri Jarmoukli, ViveCura BerlinThe dose question: how often and how long?
Now to the question that brought you here. The honest answer has two parts: what the data show, and how much of that fits into your life.
| Frequency | What the Kuopio data show | Practical interpretation |
|---|---|---|
| 1 time per week | Reference group. All comparisons refer to these people. | Pleasant, but probably too rare for a measurable training stimulus on the vascular system. |
| 2 to 3 times per week | Tendency towards lower risk, but statistically mostly not confirmed (confidence intervals cross 1). | A realistic starting point for most people. Easy to combine with exercise or swimming. |
| 4 to 7 times per week | This is where the clearest associations lie for sudden cardiac death, cardiovascular mortality, high blood pressure and stroke. | Everyday life in Finland, feasible for very few people in Germany. No reason to put yourself under pressure. |
| Under 11 minutes per session | Reference for the duration analysis. | Short. The circulatory stimulus only builds up properly after a few minutes. |
| 11 to 19 minutes | Hazard ratio 0.93 (0.67 to 1.28) for sudden cardiac death. | The practicable zone for most people. |
| Over 19 minutes | Hazard ratio 0.48 (0.31 to 0.75) for sudden cardiac death. | Only if it feels good. Longer is not automatically better, and the limit is individual. |
Many people read “four to seven times per week” and think: I will never manage that, so I will skip it. That is the wrong conclusion.
The studies do not compare sauna against no sauna. They compare more often against less often, within a culture in which practically everyone uses the sauna. Two sessions per week are not a failure to reach an ideal. They are a step in the direction the curve points to.
Sauna plus movement is stronger than either alone
If you take only one thing from this section, take this: the sauna does not replace movement. It amplifies it.
Lee and colleagues randomly assigned 47 inactive adults with at least one cardiovascular risk factor, average age 49 years, to three groups: training plus 15 minutes of sauna afterwards, training alone, or control. Over eight weeks.
Training alone improved cardiorespiratory fitness compared with the control by 6.2 ml per kilogram per minute and reduced fat mass, but did not change blood pressure. Compared with the training-only group, the sauna group showed an additional improvement in fitness of 2.7 ml per kilogram per minute, a systolic blood pressure 8.0 mmHg lower and lower total cholesterol values.
What this may mean for you: this is the best randomised evidence so far. It is small and short, but it points in the same direction as the cohort data. And it says clearly: the sauna adds to exercise, it does not replace it.
Lee E et al., American Journal of Physiology, 2022. DOI: 10.1152/ajpregu.00076.2022Fitting with this is the combination analysis from the Kuopio cohort: in 2,291 men, the combination of high cardiorespiratory fitness and frequent sauna sessions was associated with a hazard ratio of 0.31 (0.16 to 0.63) for sudden cardiac death, compared with low fitness and infrequent sauna use. High fitness alone was at 0.49 (0.34 to 0.70), frequent sauna use alone at 0.71 (0.45 to 1.10).
Where the evidence ends, and why I say so
This is where it gets uncomfortable. And for exactly that reason it matters.
Almost all the impressive numbers in this article come from observational studies. That means: nobody randomly allocated people to a sauna group and then waited twenty years. The researchers asked what participants were doing anyway, and then observed what happened afterwards.
First, the healthy user effect. People who are ill, exhausted or frail go to the sauna less often. In that case it is not the sauna that makes people healthy, it is health that makes the sauna possible. The study authors adjust for many risk factors, but they cannot adjust for everything they did not measure.
Second, the group sizes. In the original study, the high frequency group contained only 201 of 2,315 men, with 10 sudden cardiac deaths. Numbers like that produce wide confidence intervals. A result of 0.37 with an interval from 0.18 to 0.75 is statistically striking, but it is not a precise figure.
Third, transferability. Eastern Finland in the nineteen eighties is not Berlin today. There the sauna is culturally embedded, technically standardised and part of family life. Someone who visits a crowded spa twice a month here is doing something different.
Randomised trials do exist. They are small and short. A systematic review of 40 clinical studies with a total of 3,855 participants concluded that regular dry sauna bathing might have health benefits, but that the studies were mostly small, only 13 randomised, and that robust data on the frequency and extent of adverse effects are missing.
For me the sauna is neither a medicine nor a miracle remedy. It is a low-threshold lifestyle factor with plausible physiology, good tolerability for most people and a body of data that points consistently in a favourable direction.
That is considerably more than can be said about most wellness offerings. And it is considerably less than proof.
When the heart is already ill: where caution is needed
Now comes the part I consider most important. Because the same physiology that explains the benefit also explains the risk.
A healthy heart answers the widening of the vessels with more beats. A heart with a narrow aortic valve, with unstable blood supply or with exhausted pump function cannot do that to the same extent.
In the review by Hannuksela and Ellahham in the American Journal of Medicine, the following are explicitly named as contraindications:
- Unstable angina pectoris. Chest pain that is new, comes on at rest or is getting worse.
- Recent heart attack. The recovery phase of the heart muscle does not tolerate an additional circulatory stimulus.
- Severe aortic valve stenosis. With a narrow valve, the drop in blood pressure in the heat can become dangerous, because the heart cannot increase output sufficiently.
From clinical practice and from later reviews come further situations in which I advise restraint:
- Decompensated heart failure. Meaning acute shortness of breath, swollen legs, rapid weight gain through fluid.
- Pronounced cardiac arrhythmias or a known tendency to fainting episodes.
- Pronounced orthostatic dysregulation. Anyone who already sees black when standing up in everyday life has little reserve in the sauna.
- Acute infection with fever, marked fluid deficit or fresh surgical wounds.
- Pregnancy with complications. In uncomplicated pregnancies the Finnish literature describes sauna bathing as well tolerated, with complications the question belongs in the care of the treating practice.
The good news alongside this, because fear is a poor adviser: the same review notes that the sauna is well tolerated by most people with coronary artery disease who have stable angina pectoris or a heart attack that was a long time ago. And that fatal events in the sauna are rare overall.
Heart failure: differentiate rather than forbid across the board
In chronic heart failure the situation is more interesting than many people think. In Japan a distinct form of therapy was developed from it.
Kihara and colleagues treated 20 patients with chronic heart failure in NYHA class II or III daily for two weeks with a dry sauna at 60 degrees for 15 minutes, followed by 30 minutes of bed rest under a blanket. Ten comparable people formed the control group.
In 17 of 20 treated patients the clinical complaints improved. Flow-mediated dilation of the arm artery increased significantly, while the response to nitroglycerin remained unchanged. That suggests that the function of the inner vessel lining improved. BNP values, a marker of cardiac strain, fell.
What this may mean for you: in stable, well managed heart failure, measured mild warmth under supervision may make sense. Note the conditions: 60 degrees, not 90. Medically accompanied, not spontaneously at the spa.
Kihara T et al., Journal of the American College of Cardiology, 2002. DOI: 10.1016/s0735-1097(01)01824-1A systematic review with meta-analysis from Uppsala summarised nine studies. The analysis of seven studies showed, for infrared sauna at 60 degrees for 15 minutes, five times per week over two to four weeks, a reduction in BNP, a smaller cardiothoracic ratio and an improvement in left ventricular ejection fraction. No significant effect appeared for blood pressure and atrial size. The authors rated the strength of the evidence as moderate to insufficient.
These data come from infrared cabins within a defined treatment protocol, not from the classic Finnish sauna at 80 to 100 degrees. The results therefore cannot simply be transferred to a weekend sauna visit.
If you have heart failure and want to use warmth, discuss temperature, duration and frequency with your cardiologist beforehand. That is not a formality, it is the difference between a stimulus and too much.
Medication: what changes with diuretics, beta blockers and blood pressure drugs
This is the point that is almost always missing in wellness articles. Yet it concerns a great many people.
- Diuretics (water tablets). They lower blood volume. The sauna lowers it further through sweat. Both together can amplify the drop in blood pressure and shift the electrolytes. Keep an eye on how much you drink, rather avoid very long sessions.
- Beta blockers. They limit the rise in heart rate. It is exactly this rise that compensates for the widening of the vessels in the heat. So the compensation is smaller, and dizziness on standing up can occur more often.
- ACE inhibitors, sartans, calcium channel blockers. They lower blood pressure anyway. The additional drop in the heat can become more noticeable, especially in the first weeks after a new prescription.
- Nitrates. They widen the vessels strongly. Combined with heat this can lead to a marked drop in blood pressure.
- Sedatives, sleeping tablets and alcohol. They dampen the circulatory counter-regulation and the perception of warning signals. This combination is considered particularly risky.
In the review by Hannuksela and Ellahham, alcohol consumption during sauna bathing is explicitly named as a risk factor for drops in blood pressure, arrhythmias and sudden deaths. A later review attributes the rare deaths in saunas mainly to the combination of alcohol, pre-existing illness and being alone.
This is not a moral question. It is physiology. Alcohol opens the vessels further, dampens the counter-regulation and dehydrates.
Three levers you can put into practice this week
Enough theory. What follows from this in concrete terms?
Lever 1: two fixed appointments instead of one vague intention
- Couple the sauna to something that happens anyway: after swimming, after sport, on a fixed evening.
- Two sessions per week are the realistic starting point. Not seven.
- 10 to 15 minutes per session, followed by at least as long a rest.
Lever 2: take the exit as seriously as the stay
- Sit up in the cabin for the last minute before you stand up.
- Cool down from the feet upwards, not head first.
- After the last session, deliberately lie down for ten minutes. Blood pressure needs that time.
- If you have known arrhythmias, rather skip the cold plunge pool.
Lever 3: build the combination, do not look for the shortcut
- Sauna after movement, not instead of movement. That is the point where the RCT was clearest.
- Plan how much you drink before and afterwards, especially while taking diuretics.
- No alcohol before or during sauna bathing.
- With known heart disease or new medication, clarify it medically once beforehand instead of guessing.
This is not about reaching a number. It is about something many people in midlife have lost: a regular moment in which the body is taken out of permanent mode.
Heat, then cold, then rest. That is a rhythm. And a circulation that knows rhythms is more likely to stay adaptable than one that knows only continuous strain. That is not wellness poetry, it is the logic behind the pulse wave velocity that dropped in the measurements.
And now you know why the question is not whether the sauna is healthy. The question is: for which body, at which dose, under which conditions.
Frequently asked questions about sauna and the heart
How many sauna sessions per week make sense for the heart?
The Finnish cohort data show the clearest association at 4 to 7 sauna sessions per week. In the Kuopio study, the hazard ratio for sudden cardiac death in that group was 0.37 compared with men who had one session per week. Even 2 to 3 sessions per week showed a tendency in the same direction, though statistically weaker. Important: these are observational data, not proof of cause and effect. For healthy people, 2 to 4 times per week is a realistic starting point. If you have heart disease, clarify the frequency with your physician beforehand.
How long should a single sauna session last?
In the Kuopio study, duration was linked to risk as well. Compared with sessions under 11 minutes, the hazard ratio for sudden cardiac death in sessions over 19 minutes was 0.48. That does not mean longer is always better. It means that very short stays probably barely create a circulatory stimulus. In practice, 10 to 20 minutes per session works well, as long as it feels good. Dizziness, palpitations or nausea are always a signal to leave immediately.
Can the sauna lower blood pressure?
There are indications that it can. In an experimental study of 102 people with at least one cardiovascular risk factor, systolic blood pressure fell on average from 137 to 130 mmHg after 30 minutes of sauna, and diastolic pressure from 82 to 75 mmHg. Pulse wave velocity, a measure of arterial stiffness, also dropped. In a randomised trial over 8 weeks, the group doing exercise plus sauna had a systolic blood pressure 8.0 mmHg lower than the group doing exercise alone. So the sauna may make a contribution, but it does not replace prescribed blood pressure treatment.
Can I use the sauna if I have high blood pressure?
With well controlled, stable high blood pressure there is usually nothing against sauna bathing, and the data point rather towards a favourable association. In the Kuopio cohort, frequent sauna bathing was linked to a lower risk of newly developing hypertension. The picture is different with uncontrolled or very high readings, with medication that has just been started or changed, and with strong blood pressure fluctuations. In those situations the question belongs in a medical consultation first.
When is the sauna not suitable for someone with heart disease?
The classic contraindications are unstable angina pectoris, a recent heart attack and severe aortic valve stenosis. The sauna is also unsuitable in decompensated heart failure, meaning acute shortness of breath, fluid retention or rapid weight gain. With pronounced arrhythmias, marked orthostatic circulatory weakness and acute infections with fever the rule is: clarify first, then use the sauna. In stable coronary artery disease with stable angina or a heart attack that was a long time ago, the literature describes sauna bathing as well tolerated by most people.
How long after a heart attack should you wait before using the sauna?
There is no fixed number of weeks that applies to everyone. A recent heart attack is a contraindication, an attack that was a long time ago in a stable situation usually is not. Where exactly the line runs depends on pump function, on arrhythmias, on exercise capacity in stress testing and on medication. That assessment belongs in cardiology follow-up and cannot be made through a blog article.
What should I keep in mind if I take beta blockers, diuretics or blood pressure medication?
These medications act on exactly the regulation the sauna calls upon. Diuretics remove fluid, and the sauna adds to that through sweating. This can amplify the drop in blood pressure. Beta blockers limit the rise in heart rate that the body actually needs to compensate for the widening of the vessels. Blood pressure medication and nitrates can amplify the drop after standing up. In practice that means: stand up slowly, keep an eye on how much you drink, rather avoid cold plunge pools if you are prone to arrhythmias, and talk the combination through once with the physician treating you.
Does the sauna replace endurance training?
No. In the randomised trial over 8 weeks, the exercise-only group improved endurance performance considerably more than the control group, plus 6.2 ml per kilogram per minute. There the sauna acted as an addition, not a replacement: exercise plus sauna came out more favourably than exercise alone for endurance, systolic blood pressure and total cholesterol. In the Kuopio cohort, the combination of high fitness and frequent sauna bathing was linked to the lowest risk of sudden cardiac death. So the sauna is an addition to training, not a shortcut around it.
Why do I feel dizzy after the sauna?
In the heat the skin vessels widen strongly, blood pools in the periphery, and the return flow to the heart drops. When you stand up, blood pressure can therefore dip briefly. On top of that comes the fluid loss through sweating. If you take blood pressure medication or diuretics, are older or have drunk little, you feel it more. What helps: come up slowly from lying or sitting, end the last sauna session with a calm cooling phase, drink enough and never use the sauna on an empty or overly full stomach.
Why is alcohol in the sauna such a problem?
Alcohol widens the vessels further, dampens the circulatory counter-regulation and promotes fluid loss. In the review by Hannuksela and Ellahham, alcohol consumption during sauna bathing is explicitly named as a risk factor for drops in blood pressure, arrhythmias and sudden deaths. Later analyses also attribute the rare deaths in saunas mainly to the combination of alcohol, pre-existing illness and being alone. So the rule is: no alcohol before or during sauna bathing, and if you have known heart disease, try not to use the sauna alone.
How robust are the Finnish sauna studies really?
They are well done, but they remain observational studies. The Kuopio cohort has long follow-up periods and adjusts for many risk factors. Even so, three limitations remain: first, healthier people might simply use the sauna more often, which is the healthy user effect. Second, the group with 4 to 7 sessions per week was small, only 201 of 2,315 men in the original analysis. Third, the data come from a culture where sauna bathing is everyday life, and they cannot be transferred without checking. Randomised trials so far exist only in small numbers and over short periods. So the direction is plausible, but causality is not proven.
Read on in the guide Forces of Nature
The sauna is one of several forces of nature that can train the circulation. Heat and cold work with the same principle: a measured stimulus, then recovery, then adaptation.
Sauna and the Heart: How Often Is Healthy?
Dose, Finnish cohort data and precautions in heart disease.
You are hereIce bathing for beginners: the right way in
The counterpart to heat. How to dose the cold stimulus without overtaxing the body.
How much sun does the body really need?
Between fear of skin cancer and deficiency: an honest question of dose.
Vitamin D deficiency in winter
Why the sun is not enough during the dark season.
All articles in the Forces of Nature cluster
Heat, cold, light and movement as medical stimuli.
ViveCura Blog overview
All guide clusters from gut and hormones to sleep.
Sources
All details were cross-checked against title, journal, year and DOI via PubMed. The study type is given in square brackets.
- 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. DOI: 10.1001/jamainternmed.2014.8187 (PMID 25705824) [Real-world cohort, n=2,315, median 20.7 years]
- 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. DOI: 10.1186/s12916-018-1198-0 (PMID 30486813) [Real-world cohort, n=1,688, median 15.0 years]
- 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. DOI: 10.1093/ajh/hpx102 (PMID 28633297) [Real-world cohort, n=1,621, median 24.7 years]
- 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. DOI: 10.1212/WNL.0000000000005606 (PMID 29720543) [Real-world cohort, n=1,628, median 14.9 years]
- 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. DOI: 10.1093/ageing/afw212 (PMID 27932366) [Real-world cohort, n=2,315]
- Laukkanen T, Kunutsor SK, Zaccardi F, Lee E, Willeit P, Khan H, Laukkanen JA. Acute effects of sauna bathing on cardiovascular function. J Hum Hypertens. 2018;32(2):129-138. DOI: 10.1038/s41371-017-0008-z (PMID 29269746) [Real-world interventional study in humans, n=102]
- Lee E, Kolunsarka I, Kostensalo J, Ahtiainen JP, Haapala EA, Willeit P, Kunutsor SK, Laukkanen JA. Effects of regular sauna bathing in conjunction with exercise on cardiovascular function: a multi-arm, randomized controlled trial. Am J Physiol Regul Integr Comp Physiol. 2022;323(3):R289-R299. DOI: 10.1152/ajpregu.00076.2022 (PMID 35785965) [RCT, n=47, 8 weeks]
- Laukkanen JA, Laukkanen T, Khan H, Babar M, Kunutsor SK. Combined Effect of Sauna Bathing and Cardiorespiratory Fitness on the Risk of Sudden Cardiac Deaths in Caucasian Men: A Long-term Prospective Cohort Study. Prog Cardiovasc Dis. 2018;60(6):635-641. DOI: 10.1016/j.pcad.2018.03.005 (PMID 29551418) [Real-world cohort, n=2,291, median 26.1 years]
- 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. DOI: 10.1016/j.mayocp.2018.04.008 (PMID 30077204) [Review]
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