Based On Science And Expert Guidance
How Long Should You Stay in the Sauna for Maximum Benefits?
Welcome to “Heath Benefits of Sauna,” a BW Sauna series that thoroughly examines important questions about sauna use.
We have learned that the benefits of sauna bathing, to some extent, depend on the duration of the sauna session, the frequency of use, and the length of the session. We also know that sauna bathing can have excellent effects on cardiovascular health, brain function, and even an individual’s longevity.
To obtain the answers in this series, many scientific studies were used, and in this specific article, we will address the question of how long you should stay in the sauna to obtain the maximum benefits. So without further ado, let’s get straight to the point.
The Science of Sauna Duration
For sauna benefits, the best evidence comes from long-term cardiovascular outcomes in large population-based studies from Finland. One example of an important study was published in JAMA Internal Medicine, which demonstrated sauna sessions over the duration of 19 minutes increased health benefits including cardiovascular protection.
When comparing men who stayed in sauna sessions for less than 11 minutes against those with sauna stays over 19 minutes, there were:
- 52% lower risk of Sudden Cardiac Death (SCD)
- Significantly lower mortality rates due to fatal Coronary Heart Disease (CHD) and Cardiovascular Disease (CVD)
This suggests that longer sauna sessions, around 20 minutes or more, may achieve the strongest protective effect for the heart and circulatory system.
Safe Recommendations for Most People
Research indicates that longer sauna durations will provide the most cardiovascular benefit, however, moderation and safety should always come first. Most healthcare professionals endorse a sauna duration of 15 to 20 minutes, depending on tolerance and experience. Therefore, below are some general recommendations:
- Typical Duration: 5–20 minutes (depending on heat tolerance and experience)
- Evidence-Based Recommended Time: 15-20 minutes (to achieve the best health benefits)
- Important Safety Note: Don’t stay in longer than 20 minutes, unless you are well-hydrated
- New To The Sauna: Start with shorter 5-10 minute sessions and increase duration from there as tolerated.
Extended sauna sessions may present further risk of dehydration, lightheadedness, and/or heat exhaustion. Make sure to listen to your body.
Duration and Specific Health Outcomes
Numerous studies have investigated how sauna duration is related to health outcomes beyond heart health:
- Brain Health: Sessions of 5-14 minutes were related to a decreased risk of dementia in comparison to shorter sessions.
- Chronic Heart Failure: 15-minute infrared or “Waon” therapy sessions at 60°C with rest improved cardiac and vascular function in patients experiencing chronic heart failure.
- Male Fertility: Repeated 15-minute treatment sessions twice weekly reduced sperm count and motility temporarily—effects that returned to baseline after cessation of sauna use.
That said, these examples represent the reality that the best sauna duration instruction is dependent on health outcomes, given your personal physiology and ultimate health goals.
The Role of Frequency
Time in a sauna clearly matters, but sauna frequency may be more important.
Studies routinely demonstrate sauna frequencies of at least once per week for the most long-term health benefits.
For instance:
- Sauna sessions reported as “4-7 per week.” Length of session around “20 minutes; 80-100°c” (176-212°f).” These are associated with reduced risk in “hypertension, stroke, and dementia.”
- As short as “2-3 per week” sessions can yield cardiovascular and cognitive benefits.
- Another study reported those who frequented sauna bathing “66% lower risk of dementia;” “65% lower risk of Alzheimer’s disease,” compared to those who only went “1 time/week”.
The wellness of each user over the long term is dependent on consistency, not intensity.
Takeaway: Find Your Balance
To obtain the greatest health benefits, aim for 15-20 minute sauna sessions a few times a week. However, keep in mind that prioritizing hydration and safety is crucial.
If you have never used a sauna or have any health conditions, consult your doctor before starting.
Continue Your Sauna Wellness Journey with BW Sauna
BW Sauna is dedicated to providing content with proven facts so that its readers have access to quality information. We want our friends and clients to take care of their health so they can reach 100 years of age or more!
For this reason, we created the series “The Benefits of Sauna for Health“. If you haven’t yet read the articles answering extremely important questions, we invite you to read the publications. And if you have any questions or would like to know more about our products, please contact us!
Sauna Health Benefits Research Resources
We asked, what research is actually out there? How do we know what is sales words, and what is grounded research. Through that, we decided to compile a library of all the literature on the health benefits of sauna.
Sauna & Heart Health
Sauna benefits to vascular endothelial cardiac function
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Vascular endothelial function improved: Sauna therapy significantly increased flow-mediated dilation (%FMD), showing better blood vessel function.
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Cardiac stress decreased: Levels of BNP (a marker of heart failure severity) dropped after two weeks of sauna treatment.
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Clinical symptoms improved: 17 out of 20 patients reported better symptoms and overall cardiac function after repeated sauna sessions.
Sauna & Heart Health
Sauna effect on heart rate variability
Significant plasma volume increase: Post-exercise sauna use expanded plasma volume by about 18% after just four sessions.
Heart rate and HRV changes were small or unclear: Only minor reductions in resting heart rate and small shifts in HRV markers were observed, with unclear correlations to plasma volume.
Sauna enhanced training adaptation: Adding sauna to normal training improved physiological capacity in trained cyclists beyond training alone.
Sauna & Arthritis
Infrared Sauna in Arthritis and Spondylitis
Pain and stiffness significantly reduced: During IR sauna sessions, both RA and AS patients showed marked decreases in pain and stiffness (p < 0.05 and p < 0.001, respectively).
No adverse effects or disease flare-ups: Treatments were well tolerated, with no signs of increased disease activity or other side effects.
Short-term comfort, modest long-term benefit: Patients reported feeling comfortable and relaxed during and after sessions. Clinical improvements persisted during treatment but faded post-therapy.
Sauna & Heart Health
Advertising in Saunas and Positioning
Digital promotion gained momentum: Social media emerged as a powerful channel for business growth, offering wide reach and precise audience targeting for tailored advertising.
Marketing strategies adapted post-crisis: The health crisis reshaped the economy and reduced ad spending, pushing companies—including sauna brands—to prioritize customer acquisition through focused advertising efforts.
Medicinal benefits reinforced: Positioning centered on health advantages, with studies showing that 2–3 or ≥4 weekly sauna sessions significantly reduced the risk of respiratory diseases compared to ≤1 session per week.
Sauna & Exercise Recovery
Effects of Thermal Modalities on Exercise Recovery
- Effectiveness depends on participant type: Warm Water Immersion (WWI) was found to be more effective for athletes in increasing recovery and preventing muscle cell damage. Conversely, Infrared Sauna (IRS) and Traditional Sauna (TRS) were more effective for recovery in nonathletes.
- Significant reduction in fatigue markers: All recovery modalities played a role in reducing the blood lactate level (BLL) after physical activity, and all modalities were effective in significantly reducing heart rate (HR) in both groups after exercise.
- WWI minimized perceived pain: The WWI modality resulted in the least amount of pain in both athletes and nonathletes. Passive recovery (PAS), in contrast, tended to cause severe pain.
Sauna & Mortality
Sauna Use and Mortality Reduction
- High frequency reduces overall and cardiovascular death: Increased frequency of sauna bathing is associated with a reduced risk of sudden cardiac death (SCD), fatal coronary heart disease (CHD), fatal cardiovascular disease (CVD), and all-cause mortality.
- Maximum protective effect seen in frequent users: Compared with men bathing once per week, those reporting 4 to 7 sauna sessions per week had a significantly lower adjusted hazard ratio for SCD (0.37) and experienced a 40% reduction in all-cause mortality.
- Longer duration also lowers SCD risk: Longer sauna sessions were inversely associated with fatal cardiac events; sessions lasting more than 19 minutes were linked to a 52% lower risk of SCD compared to sessions lasting less than 11 minutes.
Sauna & Therapies
Benefits and Scope of Passive Heat Therapies
- Finnish Sauna is the most studied modality: Finnish saunas are the most widely studied passive heat therapy, characterized by high temperatures (80–100°C) and dry air (10–20% relative humidity).
- Demonstrated health benefits and disease prevention: Finnish saunas have robust evidence showing they decrease the risk of hypertension, cardiovascular disease (CVD), dementia, and respiratory conditions. They may also improve sleep, mental well-being, and longevity.
- Potential for synergistic effects and mechanism: Passive heat therapies may augment the beneficial effects of physical activity and their positive effects are linked to anti-inflammatory, cytoprotective, and anti-oxidant properties.
Sauna & Respiratory Diseases
Sauna Reduces Respiratory Diseases
- Lower respiratory disease risk: Men taking 2–3 sauna sessions per week showed a 27% reduction in respiratory disease incidence compared to ≤1 session.
- Stronger benefits with higher frequency: Those bathing ≥4 times weekly had up to a 41% lower risk, indicating a dose-response relationship.
- Pneumonia risk reduced: Frequent sauna users experienced 28–37% lower pneumonia incidence after long-term follow-up and risk adjustment.
Sauna & Health Benefits
Finnish Sauna Health Benefits
- Offers vascular and nonvascular benefits: Traditional Finnish sauna bathing, characterized by high temperatures (80°C–100°C) for brief periods, is linked to reduced risk of vascular diseases like high blood pressure and cardiovascular disease (CVD), as well as nonvascular conditions such as pulmonary diseases.
- Physiological effects mimic moderate physical activity: The physiological responses during an ordinary sauna bath correspond to those produced by moderate- or high-intensity physical activity, such as walking. This is linked to mechanisms like reduction in systemic blood pressure, improvement in endothelial function, and beneficial modulation of the autonomic nervous system.
- Sauna is generally safe, even for stable CVD patients: Sauna bathing is a safe activity and can be used in patients with stable CVD, provided it is used sensibly, though patients with unstable disease conditions like recent myocardial infarction or uncontrolled hypertension should exercise caution.
Sauna & Dementia Risk
Sauna Bathing Frequency and Dementia Risk
- Frequent use suggests reduced dementia risk: A long-term prospective cohort study suggests that frequent sauna bathing may be associated with a reduced subsequent risk of dementia in both men and women.
- Highest protection seen in moderate users: Individuals reporting 9–12 sauna sessions per month (approximately three times per week) had a significantly lower adjusted hazard ratio for dementia (HR=0.47) during the first 20 years of follow-up, compared to those bathing 0–4 times per month.
- Temperature influences protective effects: The most favorable sauna temperature range for dementia protection was 80–99 ◦C. Bathing at temperatures higher than 100 ◦C, however, was associated with an elevated risk during the initial 20 years of follow-up.
Dry Sauna & Clinical Effects
Clinical Effects of Regular Dry Sauna
- Review found benefits across multiple conditions, but studies were heterogeneous: The systematic review included 40 clinical studies involving regular dry sauna bathing (Finnish-style and infrared) and concluded there is potential evidence of health benefits across cardiovascular disease (CVD), rheumatological, pain, and respiratory conditions.
- Frequent sauna use linked to lower CVD and mortality risks: Frequent Finnish sauna use (4–7 sessions per week) was strongly associated with a reduced risk of sudden cardiac death (63% reduction), dementia (66% reduction), and a 40% reduction in all-cause mortality over a 20-year period in middle-aged men.
- Generally safe, though reversible spermatogenesis impairment noted: Regular dry sauna bathing appears to be safe and generally well-tolerated in clinical settings, but one study showed reversible reduction in sperm count and motility in healthy men after repeated sessions, with all effects reverting to normal six months after cessation.
Sauna & Health Benefits
Cardiovascular and Other Health Benefits of Sauna
- Focus on Traditional Finnish Sauna: This passive heat therapy is characterized by exposure to high environmental temperatures (80°C–100°C) and dry air (10%–20% relative humidity), traditionally used for pleasure and relaxation.
- Linked to Reduced Risk of Vascular Disease and Mortality: Emerging evidence suggests sauna bathing reduces the risk of vascular diseases such as high blood pressure and cardiovascular disease (CVD). Frequent use (4–7 sessions/wk) was associated with a reduced risk of sudden cardiac death and all-cause mortality.
- Physiological Effects and Safety Profile: The physiological responses produced during a sauna bath correspond to those of moderate- or high-intensity physical activity (like walking). Sauna bathing is generally safe for patients with stable CVD, but those with unstable conditions (e.g., uncontrolled hypertension) or those combining it with alcohol should exercise caution.
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