In a world where stress levels continue to rise and chronic health conditions affect millions, the search for effective wellness practices has led many back to ancient traditions, with modern science now confirming their benefits. Among these time-tested practices, sauna therapy stands out as one of the most researched and beneficial. A recent study published in Mayo Clinic Proceedings found that regular sauna use was associated with a 40% reduction in all-cause mortality. This statistic has captured the attention of health professionals worldwide.

Saunas have been a central part of Finnish culture for over 2,000 years, with approximately 2 million saunas serving a population of 5.5 million people. But what was once considered a cultural practice is now recognized as a powerful health intervention backed by robust scientific evidence. From cardiovascular benefits to mental health improvements, the research supporting the use of saunas continues to grow, making it one of the most accessible and practical additions to any wellness routine.

In this comprehensive guide, we'll explore the science-backed benefits of regular sauna use, the different types of saunas available, and how to incorporate this powerful practice into your life for maximum health benefits. Whether you're an athlete seeking to enhance recovery, a professional looking for stress relief, or someone focused on preventive health, understanding the full spectrum of sauna benefits can transform your approach to wellness.

What is Sauna Therapy?

Sauna therapy is a form of heat exposure where the body is subjected to temperatures typically ranging from 65°C to 90°C (150°F to 195°F), inducing a controlled form of hyperthermia. This deliberate heat stress triggers a cascade of physiological responses that, when experienced regularly, can lead to numerous health adaptations.

Different Types of Saunas

While all saunas share the common element of heat exposure, they differ in how that heat is generated and experienced:

Traditional Finnish Sauna: The original sauna experience, typically heated by wood or electric stoves that warm rocks. Water is occasionally poured over these rocks to create steam (known as "löyly" in Finnish), which temporarily increases humidity. Temperatures typically range from 170°F to 200°F (77°C to 93°C) with relatively low humidity (10-20%) in dry mode.

Steam Sauna (Turkish Bath/Hammam): Unlike Finnish saunas, steam rooms operate at lower temperatures (around 110°F to 120°F or 43°C to 49°C) but with 100% humidity. The moist heat creates a different sensation and may benefit respiratory conditions differently than dry saunas.

Infrared Sauna: Rather than heating the air, infrared saunas use infrared lamps to warm the body directly. They operate at lower temperatures (120°F to 140°F or 49°C to 60°C) while still inducing sweating. They're further categorized into:

• Near-infrared: Penetrates the skin surface

• Mid-infrared: Reaches soft tissues

• Far-infrared: Penetrates deeper into the body

Wood-Burning Sauna: The traditional method of heating saunas, creating an authentic experience with unique aromatherapy benefits from the wood.

Electrically Heated Sauna: The most common modern sauna uses electric heaters for convenience and consistent temperature control.

Smoke Sauna: An ancient Finnish technique where wood is burned in a stove without a chimney, filling the room with smoke before being ventilated and used. This creates a distinctive aroma and experience.

Historical Context

The use of saunas dates back thousands of years across multiple cultures. The Finnish sauna tradition is perhaps the most well-known, with archaeological evidence suggesting that sauna use in Finland dates back to around 7000 BCE. Similar heat therapy practices developed independently across cultures:

• Russian Banya

• Native American sweat lodges

• Japanese Mushi-buro

• Korean Jjimjilbang

• Turkish Hammam

What began as practical solutions for bathing in cold climates evolved into social and spiritual practices. The Finnish saying "saunassa ollaan kuin kirkossa" translates to "one should behave in the sauna as in church," highlighting the reverence traditionally given to the practice.

Today, sauna use has transcended its cultural origins to become a global wellness practice, with modern research validating what traditional wisdom has long suggested: regular heat exposure offers profound health benefits.

The Science Behind Sauna Benefits

The physiological effects of sauna bathing are complex and far-reaching, affecting nearly every system in the body. Understanding these mechanisms helps explain why saunas offer such diverse health benefits.

Core Temperature and Cardiovascular Response

When you enter a sauna, your core body temperature begins to rise. This triggers a thermoregulatory response as your body works to maintain its internal balance, or homeostasis. Blood vessels near the skin dilate (vasodilation), increasing blood flow to the skin's surface to facilitate cooling. Heart rate increases, often reaching 100-150 beats per minute during a typical session, similar to moderate-intensity exercise.

This cardiovascular response—increased heart rate and vasodilation—creates what researchers call "cardiovascular conditioning," a beneficial stress that, when experienced regularly, strengthens the cardiovascular system. Dr. Jari Laukkanen, a cardiologist and leading sauna researcher from the University of Eastern Finland, describes it as "a form of passive cardiovascular conditioning."

Heat Shock Proteins and Cellular Adaptation

At the cellular level, heat exposure activates heat shock proteins (HSPs), molecular chaperones that help repair damaged proteins and protect cells from stress. Dr. Rhonda Patrick, a biomedical scientist and expert in sauna research, explains, "Heat shock proteins are induced by heat stress and play a role in preventing protein aggregation, thereby helping proteins maintain their proper three-dimensional structure."

This cellular response has implications for:

• Preventing neurodegenerative diseases

• Extending lifespan

• Improving insulin sensitivity

• Muscle growth and maintenance

Hormonal Changes

Sauna use triggers significant hormonal responses:

Endorphins: These "feel-good" hormones increase during sauna sessions, contributing to the sense of well-being and pain relief that many experience.

Norepinephrine: Levels can increase up to 3-fold during sauna bathing, enhancing focus and attention while playing a role in pain modulation.

Growth Hormone: Research has shown significant increases in growth hormone levels after sauna use, supporting tissue repair and growth.

Dynorphin: This hormone, which creates feelings of discomfort during heat exposure, upregulates endorphin receptors, potentially enhancing the pleasure response to endorphins after the session.

Autonomic Nervous System Balance

Regular sauna use appears to improve autonomic nervous system function, enhancing the balance between sympathetic ("fight or flight") and parasympathetic ("rest and digest") activity. This improved balance contributes to better stress resilience and recovery.

Research Validation

The scientific understanding of sauna benefits has expanded dramatically in recent years. A landmark 2015 study published in JAMA Internal Medicine followed 2,315 Finnish men for an average of 20.7 years and found that regular sauna use (4-7 times per week) was associated with:

• 40% reduction in all-cause mortality

• 50% reduction in cardiovascular-related mortality

• 66% reduction in dementia and Alzheimer's disease

These findings have been supported by numerous subsequent studies, establishing sauna use as one of the most well-researched wellness practices available.

7 Key Benefits of Regular Sauna Use

The physiological responses to sauna bathing translate into numerous concrete health benefits, supported by a growing body of research.

1. Cardiovascular Health Improvements

Perhaps the most well-documented benefit of regular sauna use is its positive impact on heart health. Multiple studies have demonstrated significant cardiovascular benefits:

• Reduced Risk of Heart Disease: The aforementioned 20-year study found that men who used saunas 4-7 times a week had a 50% lower risk of fatal cardiovascular disease compared to those who used saunas once a week.

• Improved Vascular Function: Research published in the European Journal of Preventive Cardiology found that a single sauna session improved arterial stiffness and blood pressure in patients with cardiovascular risk factors.

• Lower Blood Pressure: A systematic review in the Journal of Human Hypertension concluded that sauna bathing produces short-term reductions in blood pressure through improved vascular function.

• Enhanced Heart Function: Regular sauna use has been shown to improve left ventricular function and reduce cardiac workload, similar to the benefits of moderate exercise.

Dr. Laukkanen notes: "The cardiovascular adaptations produced by regular sauna bathing are similar to those produced by moderate-intensity physical exercise such as walking."

2. Stress Reduction and Mental Health Benefits

The mental health benefits of sauna use are both immediate and cumulative:

• Reduced Stress Hormones: Studies show reduced cortisol levels with regular sauna use.

• Improved Mood: The increase in endorphins and other neurochemicals contributes to the "sauna glow" many users report.

• Anxiety Reduction: Research in JAMA Psychiatry found that frequent sauna bathing was associated with reduced risk of psychotic disorders.

• Depression Relief: A 2018 study published in JAMA Psychiatry found that regular sauna use was associated with a 77% reduced risk of developing psychotic disorders and a 43% reduced risk of developing depression.

The relaxation response triggered by sauna use helps activate the parasympathetic nervous system, creating a natural antidote to the chronic stress many experience in modern life.

3. Muscle Recovery and Pain Relief

Athletes and fitness enthusiasts have long used saunas for recovery, and science supports this practice:

• Reduced Muscle Soreness: Heat therapy increases blood flow to muscles, potentially accelerating recovery from exercise-induced muscle damage.

• Pain Reduction: A study in the Journal of Alternative and Complementary Medicine found that infrared sauna use helped reduce pain in patients with chronic pain conditions.

• Increased Growth Hormone: The elevation in growth hormone levels may contribute to faster recovery and tissue repair.

• Joint Mobility: The heat and increased circulation can temporarily relieve joint stiffness and improve range of motion.

4. Skin Health and Detoxification

While "detoxification" claims are often exaggerated in wellness marketing, sauna use does support the body's natural elimination processes:

• Enhanced Sweating: Profuse sweating can help eliminate certain heavy metals like lead, mercury, and cadmium, though in small amounts.

• Improved Skin Blood Flow: The increased circulation nourishes skin cells and may improve conditions like psoriasis.

• Sebum Production: The heat opens pores and can help clear sebum, potentially improving acne for some users.

• Skin Appearance: Many users report improved skin tone and clarity, likely due to increased circulation and the "sauna glow" effect.

5. Improved Sleep Quality

Sauna use, particularly in the evening, can significantly improve sleep:

• Core Temperature Effect: The post-sauna drop in core body temperature mimics the natural temperature decrease that triggers sleepiness.

• Relaxation Response: The parasympathetic activation helps transition the body into a state conducive to sleep.

• Stress Reduction: Lower stress levels naturally contribute to better sleep quality.

A study in the Journal of Sleep Research found that sauna bathing before bedtime increased slow-wave (deep) sleep and improved sleep quality ratings.

6. Immune System Support

Regular sauna use appears to strengthen immune function through several mechanisms:

• Increased White Blood Cell Activity: Heat stress temporarily activates white blood cells, potentially enhancing immune surveillance.

• Heat Shock Proteins: These protective proteins help cells resist stress and may improve overall resilience.

• Fever-Like Response: The temporary elevation in core temperature may mimic the body's natural fever response, which helps fight infections.

Research published in the Journal of Human Kinetics found that regular sauna users had fewer common colds and respiratory infections compared to non-users.

7. Potential Longevity Benefits

Perhaps most intriguing are the associations between regular sauna use and longevity:

• All-Cause Mortality Reduction: The 40% reduction in all-cause mortality found in frequent sauna users suggests broad systemic benefits.

• Reduced Inflammation: Chronic inflammation is associated with numerous age-related diseases, and sauna use has been shown to reduce inflammatory markers.

• Cellular Protection: The activation of heat shock proteins may protect against age-related protein damage.

• Telomere Preservation: Some preliminary research suggests heat stress may help maintain telomere length, a marker of cellular aging.

While more research is needed to fully understand these associations, the consistent pattern of health benefits suggests sauna use may indeed contribute to healthier aging and longevity.

How to Properly Use a Sauna

To maximize benefits while ensuring safety, follow these guidelines for optimal sauna use:

Preparation Steps

Hydration: Drink 1-2 glasses of water before entering the sauna to prepare for fluid loss through sweating.

Timing: The best time for sauna use depends on your goals:

• For sleep improvement: 1-2 hours before bedtime

• For muscle recovery: After exercise

• For stress reduction: Any time, but consistent timing helps establish a routine

Clothing: Minimal clothing is recommended to allow for maximum sweating. Traditional Finnish sauna practice involves nude bathing, but a towel is appropriate in public settings.

Pre-Sauna Shower: A quick warm shower before entering helps clean the skin and begin the warming process.

Recommended Duration and Temperature

First-Time Users: Start with just 5-10 minutes at a lower temperature (around 160°F/70°C for traditional saunas or 120°F/49°C for infrared).

Regular Users: Gradually work up to 15-20 minutes per session.

Advanced Users: May enjoy sessions of 20-30 minutes, sometimes with brief cooling breaks.

Temperature Guidelines:

• Traditional Finnish sauna: 170-190°F (77-88°C)

• Infrared sauna: 120-140°F (49-60°C)

• Steam room: 110-120°F (43-49°C) with 100% humidity

Proper Breathing Techniques

• Breathe deeply and naturally through your nose when possible

• If the heat feels intense, breathe through a small towel

• Focus on relaxed, diaphragmatic breathing to enhance the relaxation response

Post-Sauna Cooling and Recovery

Cooling Down: Gradual cooling is recommended:

• Step outside the sauna for fresh air

• Take a lukewarm or cool (not cold) shower

• For the brave: traditional cold plunge or snow roll (with proper preparation)

Rehydration: Replace lost fluids with water or electrolyte drinks. Avoid alcohol immediately after sauna use as it can amplify dehydration.

Rest Period: Allow 10-15 minutes of rest after cooling to let your body return to normal temperature.

Frequency Recommendations

Research suggests the following frequency guidelines for optimal benefits:

Minimum Effective Dose: 2-3 sessions per week of 15-20 minutes each appears to provide significant health benefits.

Optimal Frequency: The Finnish research showing the most dramatic benefits was based on 4-7 sessions per week.

Session Spacing: Daily use is fine for most healthy individuals, but beginners should start with 2-3 times weekly to allow adaptation.

The Benefits of Ice Baths

While saunas offer tremendous benefits through heat exposure, cold therapy through ice baths provides its own unique set of health advantages. Ice baths involve immersing the body in cold water, typically between 50-59°F (10-15°C), for short periods.

The physiological response to cold exposure includes:

• Vasoconstriction: Blood vessels narrow, reducing blood flow to extremities

• Reduced inflammation: Cold temperatures slow metabolic activity and reduce inflammatory responses

• Hormetic stress: The controlled stress of cold exposure triggers adaptive responses throughout the body

Regular ice bath use has been associated with numerous benefits:

1. Reduced Muscle Soreness and Faster Recovery

Cold water immersion has been shown to significantly reduce delayed onset muscle soreness (DOMS) after intense exercise. A meta-analysis published in the British Journal of Sports Medicine found that cold water immersion reduced muscle soreness by 20% compared to passive recovery.

2. Decreased Inflammation

The cold temperature helps reduce inflammatory responses in the body, which can be particularly beneficial for those with inflammatory conditions or after intense physical activity.

3. Improved Circulation

The alternating vasoconstriction (during immersion) and vasodilation (after exiting the cold) creates a "pumping" effect that can improve overall circulation and lymphatic flow.

4. Enhanced Mental Resilience

Regular exposure to cold stress has been shown to improve mental toughness and resilience. The practice of voluntarily subjecting oneself to discomfort builds psychological strength that transfers to other areas of life.

5. Increased Energy and Focus

Many ice bath users report significant increases in energy levels and mental clarity following cold exposure, likely due to the surge of catecholamines (adrenaline, noradrenaline) and endorphins released during the experience.

6. Improved Sleep Quality

Similar to sauna use but through different mechanisms, ice baths can improve sleep quality by triggering a rebound increase in core body temperature after the initial drop.

7. Potential Metabolic Benefits

Emerging research suggests that regular cold exposure may activate brown adipose tissue (BAT), a type of fat that burns calories to generate heat, potentially supporting weight management goals.

Contrast Therapy: Combining Sauna and Ice Bath

Contrast therapy—alternating between heat exposure (sauna) and cold exposure (ice bath)—combines the benefits of both modalities while potentially amplifying their effects.

 

How Contrast Therapy Works

The fundamental principle behind contrast therapy is the dramatic shift in blood vessel dilation:

1. Heat phase: Vasodilation occurs, increasing blood flow to the skin and extremities

2. Cold phase: Vasoconstriction occurs, driving blood back to the core

3. Repeated cycles: This "pumping" effect enhances circulation and lymphatic flow

Benefits of Contrast Therapy

Combining sauna use with ice baths may offer synergistic benefits beyond what either practice provides alone:

• Enhanced circulation: The alternating vasodilation and vasoconstriction creates a powerful circulatory pump effect

• Accelerated recovery: Athletes report faster recovery from intense training when using contrast therapy

• Improved lymphatic drainage: The pressure changes help move lymphatic fluid more efficiently

• Heightened mental clarity: The hormetic stress of temperature extremes appears to sharpen cognitive function

• Deeper relaxation: Many users report profound relaxation after completing contrast therapy sessions

Recommended Protocol

While protocols vary, a common approach to contrast therapy includes:

1. Begin with 10-15 minutes in the sauna (170-190°F/77-88°C)

2. Transition to 1-3 minutes in an ice bath (50-59°F/10-15°C)

3. Return to the sauna for another 5-10 minutes

4. Finish with a final 1-2 minute cold plunge

5. End with a rest period of 10-15 minutes at room temperature

This cycle can be repeated 2-3 times for experienced users, though beginners should start with a single cycle and gradually build tolerance.

Who Should (and Shouldn't) Use Saunas

While sauna bathing is beneficial for most people, it's not appropriate for everyone.

Ideal Candidates for Sauna Therapy

• Healthy adults looking to enhance wellness

• Athletes seeking improved recovery

• Individuals with mild hypertension (under medical supervision)

• Those experiencing chronic stress

• People with mild joint pain or muscle tension

• Individuals with mild depression or anxiety

Contraindications

Absolute Contraindications:

• Unstable angina pectoris

• Recent heart attack (within 4-6 weeks)

• Severe aortic stenosis

• Uncontrolled high blood pressure

• Pregnancy (particularly first trimester)

• Alcohol intoxication

Relative Contraindications (consult healthcare provider):

• Stable coronary artery disease

• Controlled hypertension

• History of fainting

• Certain skin conditions that worsen with heat

• Multiple sclerosis (heat sensitivity varies)

• Hemophilia or bleeding disorders

Special Considerations for Different Groups

Elderly: May benefit greatly from sauna use but should start with shorter sessions at lower temperatures and ensure proper hydration.

Children: Generally safe for children over 6 years with adult supervision, shorter sessions (5-10 minutes), and lower temperatures.

Athletes: May benefit from more frequent use, particularly after training sessions, but should ensure adequate hydration and electrolyte replacement.

Those with Chronic Conditions: Should consult healthcare providers but may experience significant benefits from properly supervised sauna use.

Sauna Product Recommendations

When considering adding a sauna to your home, several factors should guide your decision:

Features to Look for in Home Saunas

Heating Technology:

• Traditional electric: Most versatile and widely used

• Infrared: Lower temperature, more energy-efficient

• Wood-burning: Authentic experience but requires more maintenance

Construction Quality:

• Wood type: Canadian hemlock, Nordic spruce, and cedar are popular choices

• Insulation: Better insulation means faster heating and lower energy costs

• Sealing: Good door seals maintain temperature and efficiency

Safety Features:

• Automatic shut-off timers

• Temperature controls and thermostats

• Proper ventilation

Size Considerations:

• 1-2 person saunas: 4×4 feet minimum

• 3-4 person saunas: 6×6 feet minimum

• Ceiling height: Ideally 7 feet minimum

THERMALOASIS Sauna Options

THERMALOASIS offers several sauna models designed to meet different needs and spaces:

THERMALOASIS Classic Finnish: Our traditional Finnish-style sauna features premium Nordic spruce construction, efficient electric heating, and customizable bench configurations. Available in sizes from 2-person to 8-person models.

THERMALOASIS Infrared Elite: Our full-spectrum infrared sauna delivers near, mid, and far-infrared heat for maximum therapeutic benefit. Features include chromotherapy lighting, Bluetooth audio, and ergonomic backrests.

THERMALOASIS Hybrid Pro: This innovative model combines traditional and infrared heating technologies, allowing users to choose their preferred heating method or combine both for a unique experience.

THERMALOASIS Outdoor Retreat: Designed for backyard installation, this cedar-constructed sauna withstands the elements while providing an authentic sauna experience in your outdoor space.

THERMALOASIS Portable Sauna: Our space-saving solution for apartments or smaller homes, this portable infrared sauna can be set up and stored easily while still delivering core sauna benefits.

Space and Installation Considerations

Indoor Installation:

• Proximity to bathroom/shower

• Flooring (moisture-resistant)

• Electrical requirements (dedicated circuit typically needed)

• Ventilation needs

Outdoor Installation:

• Foundation requirements

• Weather protection

• Proximity to house

• Local building codes and permits

Portable Options:

• Storage space when not in use

• Setup/breakdown time

• Durability considerations

Price Range Expectations

Sauna investments vary widely based on type, size, and features:

Portable Infrared Saunas: $200-$1,000

• Best for: Limited space, occasional use, budget-conscious buyers

Pre-built Indoor Infrared Saunas (1-2 person): $1,200-$3,000

• Best for: Regular users with limited space, focused on therapeutic benefits

Pre-built Traditional Electric Saunas (2-4 person): $3,000-$7,000

• Best for: Families, authentic sauna experience, frequent use

Custom or Luxury Saunas: $8,000-$20,000+

• Best for: Dedicated enthusiasts, commercial settings, custom home wellness centers

Outdoor Sauna Cabins: $4,500-$15,000

• Best for: Those with outdoor space, seeking authentic experience

THERMALOASIS offers financing options to make these wellness investments more accessible, with monthly payment plans available on all models.

Frequently Asked Questions

How long should a sauna session last?

For beginners, 5-10 minutes is appropriate. Regular users typically enjoy 15-20 minute sessions, while experienced sauna bathers may extend to 30 minutes, sometimes with cooling breaks in between. Always listen to your body and exit if you feel dizzy or uncomfortable.

How often should I use a sauna?

Research suggests 2-3 times weekly as a minimum for health benefits, with 4-7 sessions weekly showing the most significant longevity benefits in studies. Daily use is fine for most healthy individuals once acclimated.

What's the difference between infrared and traditional saunas?

Traditional saunas heat the air to 170-190°F (77-88°C), which then heats your body. Infrared saunas use infrared radiation to directly heat your body at lower ambient temperatures (120-140°F/49-60°C). Traditional saunas create a more intense heat experience, while infrared saunas are often more comfortable for heat-sensitive individuals and more energy-efficient.

Can saunas help with weight loss?

While you will lose water weight temporarily through sweating, saunas alone are not effective for permanent weight loss. However, regular sauna use may support weight management by:

• Improving insulin sensitivity

• Enhancing recovery from exercise, potentially enabling more physical activity

• Reducing stress, which can contribute to emotional eating

A 30-minute sauna session typically burns 200-300 calories due to the increased heart rate, comparable to a brisk walk.

Is it normal to feel dizzy in a sauna?

Mild lightheadedness can occur, especially for beginners or during longer sessions. This is usually due to the drop in blood pressure from vasodilation or from dehydration. If dizziness occurs, sit down in the sauna or exit to cool down, and ensure proper hydration before your next session.

Should I shower before or after a sauna?

Ideally, both. A quick warm shower before entering cleanses the skin and begins the warming process. After the sauna, a lukewarm or cool shower helps close pores, rinse away sweat, and gradually lower your body temperature.

Can I use a sauna if I have high blood pressure?

Individuals with controlled hypertension may benefit from sauna use, as regular sessions are associated with reduced blood pressure over time. However, those with uncontrolled high blood pressure should avoid saunas until their condition is stabilized. Always consult your healthcare provider if you have any cardiovascular concerns.

Conclusion

The evidence supporting regular sauna use as a powerful wellness practice continues to grow, with benefits spanning cardiovascular health, mental wellbeing, recovery, and potentially even longevity. What makes sauna therapy particularly valuable is its accessibility—sessions as short as 15-20 minutes, 2-3 times weekly, appear to provide significant health benefits.

As we've explored throughout this guide, the physiological responses to controlled heat stress create adaptations throughout the body's systems that enhance resilience and function. From improved heart health to better sleep, reduced stress, and enhanced recovery, few wellness practices offer such a wide range of evidence-backed benefits.

Whether you're considering adding a sauna to your home or planning to utilize public facilities, incorporating regular sauna sessions into your wellness routine represents one of the most time-efficient investments you can make in your long-term health.

THERMALOASIS offers a range of sauna options to suit different needs, spaces, and budgets, making this ancient practice accessible for modern wellness seekers. Explore our collection to find the perfect sauna to begin or enhance your heat therapy journey.

References

1. Laukkanen, J. A., et al. (2015). Association Between Sauna Bathing and Fatal Cardiovascular and All-Cause Mortality Events. JAMA Internal Medicine, 175(4), 542-548.

2. Laukkanen, T., et al. (2018). Acute effects of sauna bathing on cardiovascular function. Journal of Human Hypertension, 32(2), 129-138.

3. Kunutsor, S. K., et al. (2018). Sauna bathing reduces the risk of stroke in Finnish men and women: A prospective cohort study. Neurology, 90(22), e1937-e1944.

4. Hussain, J., & Cohen, M. (2018). Clinical Effects of Regular Dry Sauna Bathing: A Systematic Review. Evidence-Based Complementary and Alternative Medicine, 2018, 1857413.

5. Laukkanen, T., et al. (2017). Acute effects of sauna bathing on cardiovascular function. Journal of Human Hypertension, 31(12), 1040-1046.

6. Heinonen, I., & Laukkanen, J. A. (2018). Effects of heat and cold on health, with special reference to Finnish sauna bathing. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 314(5), R629-R638.

7. Hannuksela, M. L., & Ellahham, S. (2001). Benefits and risks of sauna bathing. The American Journal of Medicine, 110(2), 118-126.

8. Kukkonen-Harjula, K., & Kauppinen, K. (2006). Health effects and risks of sauna bathing. International Journal of Circumpolar Health, 65(3), 195-205.

9. Podstawski, R., et al. (2019). Physiological Responses and Mood States after Daily Repeated Prolonged Exercise. Journal of Human Kinetics, 69, 59-69.

10. Mero, A., et al. (2015). Effects of far-infrared sauna bathing on recovery from strength and endurance training sessions in men. SpringerPlus, 4, 321.