Sauna and Cardiovascular Health: What Australians Should Know

What does the research say about sauna and cardiovascular health? In Finland, regular traditional sauna use, four to seven times per week, has been associated with about a 50% lower risk of fatal cardiovascular disease in a 20-year cohort study of 2,315 middle-aged men (JAMA Internal Medicine, 2015), and with a 61% lower risk of stroke in a separate study of men and women. These are observational findings: they show a strong association, not proof that sauna caused the difference. For Australians interested in their long-term heart health, they are still some of the most interesting lifestyle data available.

Why Cardiovascular Health Matters for Australians

Cardiovascular disease is a major cause of death in Australia. According to the Australian Institute of Health and Welfare, CVD was the underlying cause of 42,300 deaths in 2024, or 23% of all deaths. Coronary heart disease made up 38% of those CVD deaths and stroke 19%, and death rates were 1.5 times as high in males as in females (AIHW, Heart, stroke and vascular disease: Australian facts).

Most Australians know they should exercise more, manage stress and eat well. The challenge is usually consistency. Time-poor adults in their 40s and 50s are juggling careers, families and training loads at once, so habits that are easy to keep matter.

What the Finnish research suggests is that regular, deliberate heat exposure in a properly built sauna is linked with lower cardiovascular risk, and short-term studies show measurable changes in blood pressure and arterial stiffness after a session. For Australians with risk factors, managed hypertension or a family history of heart disease, it is worth understanding how the research works, and what it does not show.

This article focuses on cardiac and vascular outcomes specifically, and on what you can reasonably take from the evidence.

The Mechanism: How Heat Stress Trains Your Cardiovascular System

Sauna heat places a controlled stress on your cardiovascular system without loading your joints or requiring athletic capacity. Several pathways have been proposed for how this might affect long-term heart health.

Heart Rate and Cardiac Output

When you sit in a hot sauna, your core temperature begins to rise within minutes. Blood vessels in the skin dilate to release heat, and your heart rate climbs to move blood to the skin. In one laboratory study, heart rate rose by about 60–90% during 80–100°C sauna sessions (Kukkonen-Harjula et al., European Journal of Applied Physiology, 1989), a response similar to light-to-moderate exercise.

Your heart is working harder, pumping more blood each minute against widened blood vessels. Whether repeated sessions produce the same long-term adaptations as aerobic training (such as a lower resting heart rate) has not been established in controlled trials, so sauna is best seen as a complement to exercise rather than a substitute.

Endothelial Function and Vascular Health

The endothelium is the thin cellular lining of your blood vessels. It regulates vascular tone, controls inflammation, and determines how efficiently blood flows through your arteries. Endothelial dysfunction, when that lining stops working properly, is one of the earliest and most consequential steps toward atherosclerosis and heart disease.

Heat increases blood flow along the vessel walls, which is thought to stimulate nitric oxide, a signalling molecule that helps blood vessels relax. Small studies support this idea: repeated far-infrared (Waon) thermal therapy improved endothelial function in men with coronary risk factors (Imamura et al., Journal of the American College of Cardiology, 2001), and 8 weeks of hot-water immersion improved flow-mediated dilation in young sedentary adults (Brunt et al., Journal of Physiology, 2016). Neither was a traditional sauna study. For how these vascular changes relate to blood pressure, read our guide to sauna and blood pressure in Australia.

Inflammation and Heat Shock Proteins

Inflammation plays a part in the build-up of arterial plaque. Heat triggers the production of heat shock proteins (HSPs), which help protect cells from protein damage, and some researchers think heat exposure may influence inflammation. A 2018 review by the Finnish research group lists several proposed mechanisms behind sauna’s associations with heart health, including endothelial function, arterial stiffness and autonomic function (Laukkanen et al., Mayo Clinic Proceedings, 2018). These remain hypotheses rather than proven effects in sauna users.

The Evidence: What Finnish Research Actually Shows

The most important dataset in sauna cardiovascular research comes from the Kuopio Ischaemic Heart Disease (KIHD) Risk Factor Study, a long-running cohort of middle-aged men from Eastern Finland run by the University of Eastern Finland. Researchers including Professor Jari Laukkanen have published several findings from this and related cohorts.

About 50% Lower Risk of Fatal Cardiovascular Disease

Laukkanen et al., JAMA Internal Medicine (2015) followed 2,315 men aged 42–60 for a median of about 20 years. Compared with once-weekly users, men who used a sauna 4–7 times per week had about a 50% lower risk of fatal cardiovascular disease, and those using it 2–3 times per week about a 27% lower risk. Sudden cardiac death was about 63% lower and all-cause mortality about 40% lower in the most frequent users.

Because this is an observational study, it cannot rule out that frequent sauna users differed in other ways. The researchers adjusted for major cardiovascular risk factors, and the association held after adjustment, but the authors called for further studies of mechanisms. It is a strong association, not proof of cause.

A 61% Lower Risk of Stroke

A separate cohort of 1,628 men and women aged 53–74 was followed for about 15 years (Kunutsor et al., Neurology, 2018). Sauna bathing 4–7 times per week was associated with a 61% lower risk of stroke compared with once-weekly use, and 2–3 times per week with a 14% lower risk. The association was similar in men and women.

Stroke accounted for about 19% of cardiovascular deaths in Australia in 2024 (AIHW), and it is also a leading cause of disability. Observational findings like this one are promising, but they do not prove that sauna prevents stroke.

For Australians with managed hypertension, a family history of stroke or other vascular risk factors, this research is a reasonable starting point for a conversation with your GP about where regular sauna use could fit alongside proven treatments.

Sauna and All-Cause Mortality

In the 2015 KIHD paper, sauna 4–7 times per week was also associated with about 40% lower all-cause mortality, and 2–3 times per week with about 24% lower, compared with once weekly. A later study of 1,688 men and women found that the association between sauna frequency and lower cardiovascular mortality held in both sexes (Laukkanen et al., BMC Medicine, 2018).

A 2018 narrative review in Mayo Clinic Proceedings concluded that sauna bathing may be linked to lower risk of high blood pressure, cardiovascular disease and mortality, and proposed mechanisms including endothelial function, arterial stiffness and autonomic function. It is a review of mostly observational studies rather than new evidence. Our article on traditional sauna benefits puts these cardiac findings in their broader context.

Temperature Matters: Traditional Sauna vs Infrared

The long-term cardiovascular data come from traditional Finnish-style saunas: convective heat, typically around 70–100°C, with steam generated by pouring water over hot stones. This distinction matters when you are comparing products.

Infrared saunas usually run at about 50–70°C and heat the body mainly by radiant panels, so the heat load and heart rate response are generally smaller. The KIHD studies, the stroke cohort and the 2018 men-and-women cohort (which reported an average sauna temperature of about 73°C) all involved traditional Finnish saunas. There is no equivalent long-term infrared data. That does not prove infrared has no benefit; it means the evidence is different.

For a detailed breakdown of how these two modalities compare, read our article on traditional sauna versus infrared.

Traditional Sauna vs Infrared vs Hot Tub: Cardiovascular Markers Compared

The table above is not an argument against infrared saunas as a category, and the markers are general guidance rather than a head-to-head trial. But if your interest is the type of sauna behind the Finnish cardiovascular findings, that is traditional Finnish heat. Our guide to infrared saunas in Australia covers where infrared does and does not fit.

The Engineering Behind the Heat: How the Genesis Holds Finnish Temperatures

Not every home sauna can hold traditional Finnish temperatures consistently, especially in larger cabins or cooler weather. The reason is usually heater capacity and stone mass.

The Genesis uses a 9kW heater: the HUUM DROP carries about 60kg of stones and the Harvia Vega about 20kg. Stone mass is the thermal battery of the sauna: more stone means more stored heat, more steam when you pour löyly and a more stable temperature through the session. A heater with very few stones loses heat quickly after a pour or when the door opens. Learn more in our guide to löyly in sauna.

The cabin is built from clear-grade Japanese cedar with 38mm walls. Cedar is a natural insulator and a traditional sauna timber. The Genesis uses no glue, no MDF and no wood filler, so there is no adhesive in the cabin to off-gas at temperature, and the Natural finish is untreated (the Charcoal finish uses a non-VOC black paint).

Psycle Clean Air active ventilation at 88 or 120 m³/h (dual speed), plus a passive hatch, keeps air moving so the heat stays fresh rather than stale. Our guide to sauna ventilation in Australia covers why airflow matters.

The question to ask any sauna manufacturer is simple: what temperature can this unit sustain, continuously, through a full session with people inside? If the answer is vague, the engineering probably is too.

The Practical Argument for a Home Sauna

The Finnish findings were seen in people who used a sauna several times a week. For most people, that frequency is only realistic with a sauna at home: no booking, travel or timetables, so regular use is easier to sustain.

Running costs depend on your electricity tariff, preheat time and session length. Our complete guide to home sauna costs in Australia breaks down the full financial picture, including installation and running costs.

The Genesis typically preheats in 45–60 minutes. The Harvia Vega offers up to an 8-hour delay start, and the HUUM DROP can be controlled by Wi-Fi with the UKU controller, so the sauna can be hot when you are ready.

Practical Application: How to Structure Your Sauna Protocol for Cardiovascular Benefit

The KIHD data describe the frequency associated with the lowest risk; they do not prescribe a protocol. The routine below is general guidance for healthy adults. If you have a heart condition, speak to your doctor first.

Contrast Therapy: Pairing Heat with Cold

Heat widens blood vessels and cold narrows them, and alternating the two is a popular routine. It is often described as a workout for your blood vessels, but this has not been shown in controlled cardiovascular studies, and claims that it produces adaptations neither modality achieves alone are not supported. Cold shock is strongest in water between about 10 and 15°C and can trigger heart rhythm problems in susceptible people (Tipton et al., Experimental Physiology, 2017).

The Origin cold plunge is a 400 L, 316 stainless steel tub with a Wi-Fi chiller that holds water anywhere from 3 to 42°C, so it pairs naturally with the Genesis. A common routine is 10–20 minutes in the sauna followed by a short, controlled cold immersion, repeated one to three times. Treat this as general guidance rather than a cardiovascular treatment.

Psycle’s core line sums up the idea: Heat recovers you. Cold hardens you. Together, they transform you. Our guide to cold plunge benefits in Australia covers the independent research on cold immersion in detail.

Sauna Safety for Managed Hypertension and Post-Cardiac-Event Recovery

If you have cardiovascular disease, a history of cardiac events or managed hypertension, the research is not a blanket clearance. Speak to your GP or cardiologist before starting regular sauna use. The research supports sauna as a lifestyle habit for most healthy adults; it does not override individual clinical advice.

Here is what the evidence actually says about specific populations:

Managed hypertension: A single 30-minute sauna at 73°C lowered blood pressure immediately afterwards in adults with cardiovascular risk factors (Lee et al., Journal of Human Hypertension, 2018), and Finnish men who used a sauna 4–7 times per week were less likely to develop hypertension than once-weekly users (Zaccardi et al., American Journal of Hypertension, 2017). Heat and some blood pressure medications can together make dizziness or fainting more likely, so anyone on antihypertensive medication should discuss sauna use with their prescribing doctor. Our article on sauna and blood pressure in Australia covers this in detail.

After a cardiac event: Small studies, mainly from Japan, have looked at repeated mild thermal (Waon) therapy in people with heart conditions, but this is not the same as a hot Finnish sauna. If you have had a heart attack or other cardiac event, do not use a sauna until your cardiologist clears you, and follow their advice on temperature and duration.

Contraindications to be aware of: Active infection, acute inflammatory heart conditions, unstable angina, a recent heart attack and severe aortic stenosis are reasons to avoid sauna use without medical clearance. Never combine sauna with alcohol, which increases the risk of low blood pressure, heart rhythm problems and falls.

Used sensibly, sauna is generally well tolerated by healthy adults. Our complete guide to sauna health risks in Australia covers contraindications, precautions and safety for at-risk groups in full.

If you have a diagnosed cardiovascular condition, speak to your doctor before using a sauna. The studies cited here are a useful starting point for that conversation.

Beyond the Heart: Sauna and Broader Longevity Markers

The Finnish cohorts have also linked frequent sauna use with other outcomes. In KIHD men, sauna 4–7 times per week was associated with lower risk of dementia and Alzheimer’s disease (Laukkanen et al., Age and Ageing, 2017) and frequent use with lower risk of respiratory disease. Like the heart findings, these are associations.

Researchers have suggested shared mechanisms, such as effects on blood vessels, inflammation and the autonomic nervous system, but these have not been proven. Our guide to sauna and longevity in Australia covers the wider research.

Many athletes use the sauna after training because they find it relaxing, although evidence that it speeds muscle repair is limited. On sleep, a 2019 meta-analysis found that a warm shower or bath 1–2 hours before bed helped people fall asleep about 10 minutes faster (Haghayegh et al., Sleep Medicine Reviews). Saunas were not tested, but the mechanism, a later drop in core temperature, is similar.

What emerges from the research is a lifestyle habit with promising, mostly observational evidence across several areas, with cardiovascular outcomes among the best studied. It works best alongside exercise, a good diet and medical care, not instead of them.

Frequently asked questions

Is sauna good for your heart?

The evidence is promising. In a 20-year Finnish study of 2,315 men, those who used a sauna 4–7 times per week had about a 50% lower risk of fatal cardiovascular disease than once-weekly users (Laukkanen et al., JAMA Internal Medicine, 2015). This is an association, not proof of cause. Proposed mechanisms include improved blood vessel function, lower arterial stiffness and lower blood pressure.

How often should you use a sauna for cardiovascular benefits?

In the Finnish research, the lowest risk was seen with 4–7 sessions per week. Compared with once-weekly use, 2–3 sessions per week was associated with about a 27% lower risk of fatal cardiovascular disease and 4–7 sessions with about 50% lower. These are associations rather than a proven dose.

What temperature should a sauna be for heart health benefits?

The long-term data come from traditional Finnish saunas, typically around 70–100°C, but the studies did not test a temperature threshold. The KIHD participants reported an average of around 79°C, and a later cohort about 73°C. Infrared saunas run cooler and lack equivalent long-term cardiovascular data. Our guide to sauna temperature covers this in detail.

Can sauna use reduce stroke risk?

Research suggests a link. Kunutsor et al. in Neurology (2018) followed 1,628 Finnish men and women and found sauna use 4–7 times per week was associated with a 61% lower risk of stroke compared with once-weekly use, and 2–3 times per week with 14% lower risk. This is an observational association.

Is it safe to use a sauna if you have high blood pressure?

Many people with managed blood pressure use a sauna without problems, and a single session usually lowers blood pressure slightly afterwards. Because heat and some medications can cause dizziness, anyone on antihypertensive medication should discuss sauna use with their GP before starting. Begin with shorter sessions at moderate temperatures and increase gradually. Never combine sauna use with alcohol.

Does a sauna mimic the effects of exercise on the heart?

Partly. During a sauna, heart rate rises much as it does with light-to-moderate exercise, and blood vessels in the skin widen. But sauna does not build fitness or strength the way exercise does, and it should be a complement to exercise rather than a replacement. It may suit people who find intense exercise difficult, with their doctor’s agreement.

How does contrast therapy (sauna and cold plunge) affect cardiovascular health?

There is no good evidence that contrast therapy improves cardiovascular health beyond sauna alone. For exercise recovery, a 2018 meta-analysis found cold water immersion reduced muscle soreness and perceived fatigue, while contrast water therapy had a small effect on soreness only, and massage was the most effective technique overall (Dupuy et al., Frontiers in Physiology). Cold immersion briefly raises heart rate and blood pressure, so check with your doctor if you have a heart condition.

What is the best home sauna for cardiovascular health in Australia?

Look for a traditional Finnish-style sauna that holds real Finnish temperatures, with good stone mass, clean materials and proper ventilation. The Genesis from Psycle Wellness has a 9kW heater (HUUM DROP with 60kg of stones, or Harvia Vega), clear-grade Japanese cedar with 38mm walls and no glue, MDF or wood filler, and a 5-year structural cabin warranty. Free kerbside delivery is included to metro Sydney, Melbourne, Brisbane and the Gold Coast. See our guide to the best home saunas in Australia for a full comparison.