#073 Sauna Benefits Deep Dive and Optimal Use with Dr. Rhonda Patrick & MedCram
Dr. Rhonda Patrick, a biomedical scientist and co-founder of FoundMyFitness, discusses the extensive health benefits of sauna use with MedCram's Kyle Allred. The conversation covers sauna's role as an exercise mimetic, its impact on cardiovascular and brain health, mental well-being, and detoxification, along with practical usage protocols.
Deep Dive Analysis
13 Topic Outline
Introduction to Sauna Benefits and Mechanisms
Sauna as an Exercise Mimetic: Cardiovascular Health & Endurance
Sauna's Impact on Brain Health: Neurodegeneration, Stress, Depression
Molecular Mechanisms of Sauna Benefits: Heat Shock Proteins, Hormesis, BDNF
Sauna for Physical Health: Muscle Atrophy & Detoxification
Heart Rate Variability and Sauna-Exercise Synergy
Historical and Cultural Context of Heat Therapy
Types of Saunas: Traditional vs. Infrared
Rhonda Patrick's Personal Sauna Protocol
Alternative Heat Therapies: Hot Baths, Jacuzzis, and Showers
Post-Sauna Practices: Hydration and Cold Exposure
Sauna Safety: Contraindications and Monitoring Glucose
Limitations and Future Research in Sauna Science
6 Key Concepts
Heat Shock Proteins (HSPs)
Stress response proteins activated by heat that help maintain the correct 3D structure of other proteins, preventing misfolding and aggregation, which can lead to plaques in the brain (e.g., amyloid beta) and arteries.
Hormesis
The biological principle where a low dose of a stressor (like heat from a sauna, exercise, or fasting) induces an adaptive response in the body, activating beneficial cellular pathways that enhance resilience, repair, and overall health.
Dynorphin
An endogenous opioid produced in the brain during intense heat or prolonged exercise, responsible for feelings of dysphoria. Its production can lead to a subsequent sensitization of mu-opioid receptors, making the brain more responsive to feel-good endorphins.
Brain-Derived Neurotrophic Factor (BDNF)
A growth factor found in the brain that supports the survival of existing neurons, encourages the growth and differentiation of new neurons, and plays a crucial role in neuroplasticity, which is the brain's ability to adapt and rewire itself.
Neuroplasticity
The brain's capacity to change and adapt its structure and function in response to experience, learning, or environmental changes. It involves the formation of new neural connections and the strengthening or weakening of existing ones, crucial for coping with stress and preventing cognitive decline.
Cardiorespiratory Fitness
A measure of the body's ability to deliver oxygen to muscles during sustained physical activity, reflecting the efficiency of the heart, lungs, and circulatory system. It is considered a strong indicator of overall physical health and biological age.
15 Questions Answered
Frequent sauna use is associated with a lower risk of death from cardiovascular disease, sudden cardiac death, coronary heart disease, stroke, dementia, Alzheimer's disease, and all-cause mortality, often in a dose-dependent manner.
Sauna use elevates heart rate (around 120 bpm), core body temperature, and induces sweating, similar to exercise. It also leads to lower blood pressure and resting heart rate after use, mirroring post-exercise physiological changes.
Sauna use is associated with a significantly lower risk of dementia and Alzheimer's, possibly due to improved cardiovascular health and the activation of heat shock proteins, which prevent the formation of protein aggregates and plaques in the brain.
Heat shock proteins (HSPs) are stress response proteins that help maintain the proper 3D structure of other proteins, preventing misfolding and aggregation into plaques. Sauna use robustly activates HSPs, with levels elevated for about 48 hours after a session.
Dr. Rhonda Patrick anecdotally found that regular sauna use significantly improved her ability to handle stress and lowered her anxiety, suggesting a noticeable effect on mental well-being.
Sauna use can elevate core body temperature, which has been shown to have an antidepressant effect lasting up to six weeks with a single session. This may involve changes in the immune system (e.g., increased IL-10, reduced inflammation), and sensitization of opioid receptors to endorphins.
Sauna use activates stress response pathways, including NRF2, which regulates antioxidant, detoxification, and anti-inflammatory genes. It also promotes autophagy (cellular cleanup) and may be involved in stem cell activation and DNA repair.
Studies have shown that local heat application and activation of heat shock proteins (specifically HSP72) can significantly decrease muscle atrophy from disuse, suggesting a role for sauna in maintaining muscle mass.
Sauna-induced sweating can significantly increase the excretion of heavy metals like cadmium (up to 122-fold increase) and aluminum, as well as other compounds like BPA and phthalates, although some are predominantly excreted via urine.
Sauna use increases heart rate variability, which is a marker of the heart's ability to handle stress. This improvement is linked to effects on the autonomic nervous system, specifically increased parasympathetic activity and lower sympathetic activity, similar to exercise.
While sauna alone improves cardiorespiratory fitness compared to no exercise, combining sauna use with aerobic exercise leads to better cardiorespiratory fitness than either activity alone, indicating a synergistic effect. Exercise remains "king" for overall health.
Traditional saunas heat the ambient air (often to ~175-200°F) and may involve pouring water over hot rocks for humidity. Infrared saunas use thermal radiation to directly heat the body (typically to ~140°F) and generally operate at lower air temperatures.
While not as extensively studied as traditional saunas, hot baths and jacuzzis (e.g., 20 minutes at 104°F with shoulders submerged) appear to offer similar benefits, including elevated heat shock proteins, increased BDNF, and positive effects on depression and cardiovascular health.
Alcohol should never be consumed before or during sauna use. Elderly individuals prone to low blood pressure, or those with recent heart attacks, unstable angina pectoris, or severe aortic stenosis should avoid saunas or consult a physician. Children and pregnant women should also avoid sauna use due to thermal regulation differences and potential fetal abnormalities, respectively.
A temporary rise in glucose levels during sauna use might be due to the concentration effect from sweating out plasma water, or it could be influenced by whether one is in a fed or fasted state. This transient effect is generally not a concern, as long-term sauna use is associated with improved fasting glucose and insulin sensitivity.
18 Actionable Insights
1. Frequent Sauna Use for Longevity
Use the sauna 4-7 times per week to significantly lower your risk of all-cause mortality by 40%, and reduce the risk of cardiovascular disease, sudden cardiac death, stroke, dementia, and Alzheimer’s disease, as more frequent use leads to more robust health benefits.
2. Optimize Sauna Duration & Temperature
Aim for 20 minutes in a traditional sauna heated to approximately 174°F with 10-20% humidity, as studies show this protocol significantly reduces cardiovascular disease-related death and other health risks compared to shorter durations.
3. Combine Sauna with Exercise
Integrate sauna use directly after aerobic exercise to achieve superior cardiorespiratory fitness compared to exercise or sauna alone, leveraging the synergistic benefits for overall physical health and performance.
4. Sauna for Brain & Mental Health
Utilize sauna 4-7 times weekly to potentially reduce dementia and Alzheimer’s risk by 60-66%, and consider it for antidepressant effects, as a single session has been shown to provide relief for up to six weeks by sensitizing opioid receptors and reducing inflammation.
5. Sauna for Cardiovascular Protection
Use the sauna 4-7 times per week to lower hypertension risk by 46% and improve heart rate variability, as sauna mimics moderate aerobic exercise and promotes beneficial physiological changes like lower blood pressure.
6. Activate Cellular Repair Pathways
Engage in sauna use to activate heat shock proteins and NRF2, which promote anti-inflammatory, antioxidant, and detoxification responses, helping to prevent plaque formation, muscle atrophy, and support overall cellular health and anti-aging.
7. Sauna for Heavy Metal Detox
Incorporate sauna bathing to facilitate the excretion of heavy metals like cadmium (with a 122-fold increase in sweat) and aluminum through profuse sweating, aiding the body’s natural detoxification processes.
8. Manage Stress & Anxiety with Sauna
Use sauna to reduce stress and anxiety, as it triggers the release of feel-good endorphins and sensitizes mu-opioid receptors, making you more capable of handling stress and experiencing positive emotions.
9. Use Sauna for Productivity & Creativity
Leverage sauna time for mental tasks like hashing through ideas, reciting presentations, or creative thinking, as the environment can enhance memory and provides a valuable, phone-free break from distractions.
10. Consider Hot Baths as Alternative
If a sauna is unavailable, take hot baths at 104°F, submerged from the shoulders down for 20 minutes, as they can also elevate heat shock proteins, brain-derived neurotrophic factor (BDNF), and offer cardiovascular and mood benefits.
11. Hydrate with Electrolytes Post-Sauna
Replenish fluids and electrolytes after sauna use by drinking green juice (e.g., kale, lemon, cucumber) or electrolyte supplements (like Noon or ketone salts), to compensate for sodium, magnesium, and potassium lost through profuse sweating.
12. Practice Cold Exposure Post-Sauna
Consider cold showers or plunges after a sauna session, but wait 2-5 minutes between hot and cold extremes to allow your body to adjust and prevent dizziness or other adverse reactions from rapid blood pressure changes.
13. Listen to Your Body in Sauna
Exit the sauna if your heart rate becomes excessively fast or you feel very uncomfortable, rather than just slightly uncomfortable, to ensure safety and prevent overexertion.
14. Set a Timer for Sauna Sessions
Use an external timer or alarm during sauna sessions to prevent accidentally staying in too long, especially if you are prone to falling asleep in the comfortable heat.
15. Consult a Medical Professional
Always consult your physician before starting sauna use, especially if you have pre-existing health conditions, to ensure it is safe for you.
16. Avoid Alcohol with Sauna
Never consume alcohol before or during sauna use, as it can be extremely dangerous and potentially deadly due to its effects on the body in a hot environment.
17. Sauna Contraindications
Avoid sauna use if elderly and prone to low blood pressure, have unstable angina pectoris, severe aortic stenosis, or are pregnant; children should also avoid prolonged sauna exposure due to underdeveloped thermal regulation mechanisms.
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8 Key Quotes
The more frequent the sauna bathing, the more robust the health benefits are.
Dr. Rhonda Patrick
Sauna use is essentially mimicking moderate aerobic cardiovascular exercise.
Dr. Rhonda Patrick
I think that sauna use should be up there. I think it should be included in that sort of, you know, bag of things that are known to improve what's called our health span.
Dr. Rhonda Patrick
Heat shock proteins are doing something cool.
Dr. Rhonda Patrick
If you can't adapt to the changing environment, then you might become depressed.
Dr. Rhonda Patrick
Exercise is king for sure, when it comes to, to the best possible thing you could do for your overall health.
Dr. Rhonda Patrick
I think it's a beautiful thing that phones don't work in a sauna, you know, it gets too hot for phones to work. So it's a, it's a built-in break for me to, uh, take a break from my phone, which I love.
Dr. Rhonda Patrick
We're talking beneficial side effects, right?
Dr. Rhonda Patrick
2 Protocols
Rhonda Patrick's Personal Sauna Protocol
Dr. Rhonda Patrick- Frequency: Aims for 4 times a week, but varies between 2-5 times a week.
- Timing: Often immediately after high-intensity interval training (e.g., Peloton bike workout).
- Temperature: Sauna is typically around 186 degrees Fahrenheit.
- Duration: Stays in for 20-30 minutes, adjusting based on workout intensity.
- Humidity: Adds hot water to rocks to achieve 10-20% humidity.
- Post-Sauna: Rests for 2-5 minutes, then sometimes uses a cold plunge or cold shower.
- Hydration: Drinks green juice (kale, lemon, cucumber), sugar-free Nuun, or Keto Start (ketone salt with electrolytes) after sauna.
- Activities: Takes science papers, recites presentations, hashes through ideas, meditates, or listens to podcasts/music.
Japanese Way On Therapy (Infrared Sauna Protocol)
Dr. Rhonda Patrick (describing the protocol)- Heat up to about 140 degrees Fahrenheit in an infrared sauna.
- Stay in the infrared sauna for 15-30 minutes.
- Immediately after, be wrapped in a hot blanket for an additional 15-30 minutes.