#037 Dr. Jari Laukkanen on Sauna Use for the Prevention of Cardiovascular & Alzheimer's Disease
This episode features Dr. Jari Laukkanen, a cardiologist and scientist, discussing his research on sauna use. His studies show long-term sauna use significantly reduces cardiovascular and all-cause mortality, and lowers the risk of dementia and Alzheimer's disease.
Deep Dive Analysis
14 Topic Outline
Introduction to Dr. Laukkanen's Sauna Research
Sauna Use and Cardiovascular & All-Cause Mortality
Dose-Response Relationship of Sauna Frequency and Duration
Mechanisms for Sauna's Cardiovascular Benefits
Sauna's Mimicry of Aerobic Exercise
Optimal Sauna Duration and Temperature
Sauna Use and Reduced Risk of Dementia & Alzheimer's
Role of Heat Shock Proteins in Brain Health
Endocrine Effects of Sauna: Growth Hormone Increase
Sauna Use in Conjunction with Exercise
Sauna's Impact on Mood and Stress Reduction
Finnish Sauna Culture and Cold-Water Immersion
Safety Considerations for Hot-to-Cold Transitions
Synergistic Effects of Sauna and Exercise
4 Key Concepts
All-cause mortality
This refers to death from any cause, and a reduction in all-cause mortality is often considered a strong indicator of increased longevity or overall health span. Dr. Laukkanen's research showed a strong effect of sauna use on reducing this.
Dose-response relationship
This concept describes how the magnitude of an effect (like health benefits) increases with the 'dose' of an intervention (like sauna frequency or duration). The study found that more frequent and longer sauna sessions led to greater reductions in mortality risk.
Heat shock proteins (HSPs)
These are signaling proteins activated by heat stress that play a crucial role in maintaining the correct three-dimensional structure of other proteins. They help repair misfolded proteins, preventing aggregation and plaque formation, which is relevant for neurodegenerative diseases like Alzheimer's.
Hormetic stress / Hormesis
This refers to a beneficial biological response to low exposures to toxins or other stressors, such as heat or cold. It involves activating genetic pathways, like those for heat shock proteins, that help the body adapt and become more resilient to stress.
7 Questions Answered
Dr. Laukkanen's 20-year study found that men using the sauna 2-3 times a week had a 27% lower cardiovascular-related mortality and 24% lower all-cause mortality, while those using it 4-7 times a week had a 50% lower cardiovascular-related mortality and 40% lower all-cause mortality compared to men using it once a week.
Sauna use can decrease blood pressure, balance the autonomic nervous system, improve endothelial cell function, and enhance arterial stiffness and compliance, all of which are also positively affected by aerobic exercise.
Based on Dr. Laukkanen's study, staying in the sauna for more than 20 minutes per session, at a temperature of around 79 degrees Celsius (174 degrees Fahrenheit), was associated with the most robust health benefits, including reduced cardiovascular and all-cause mortality.
Yes, Dr. Laukkanen's lab published research showing a strong association between sauna use and a 66% reduction in the risk of dementia and a 65% reduction in Alzheimer's disease risk over a 20-year follow-up period.
While it's common in Finland to use the sauna after exercise, and the host is inclined to do so for growth hormone benefits and muscle repair, Dr. Laukkanen speculates it might be better after strength training to relax and improve vessel function, as strength training can sometimes temporarily increase arterial stiffness.
Sauna use can noticeably improve mood and help deal with stress and anxiety, potentially due to its effects on cardiorespiratory fitness and the release of endorphins, which promote relaxation and feelings of well-being.
For most of the population, combining hot sauna with cold-water immersion appears to be safe and feels good. However, for patients with coronary heart disease, especially if it's not a stable condition, it can be harmful due to the risk of coronary artery spasm from rapid vasodilation followed by vasoconstriction.
6 Actionable Insights
1. Frequent Sauna Use for Longevity
To achieve the strongest reductions in risk for all-cause mortality, dementia, and Alzheimer’s disease, use the sauna at least four times a week for at least 20 minutes at 174 degrees Fahrenheit (79 degrees Celsius).
2. Optimal Sauna Session Duration
Aim for sauna sessions of at least 20 minutes, as shorter durations (e.g., 10-15 minutes) may not be enough to get all the health benefits.
3. Sauna After Exercise
Consider using the sauna after a workout to enhance growth hormone release for muscle repair and recovery, as exercise primes muscles and the brain to utilize growth hormone and IGF-1 more effectively.
4. Sauna After Strength Training
It may be beneficial to use the sauna after strength training to promote relaxation and improve vessel function, potentially counteracting any temporary increase in arterial stiffness.
5. Caution with Hot-to-Cold Immersion
If you have coronary heart disease, especially if it’s not a stable condition, be very careful or avoid transitioning directly from a hot sauna to cold immersion due to the potential risk of coronary artery spasm.
6. Holistic Health Management
In addition to sauna use and exercise, it is crucial to manage other risk factors for cardiovascular health, such as blood pressure, lipids, smoking, and obesity.
5 Key Quotes
long-term sauna use appears to reduce heart-related mortality, but even more surprisingly also may have a strong effect on what is known as all-cause mortality, which literally means death from all causes, which sounds a whole lot like longevity if you think about it.
Host
The risk reduction can be seen among those who were more than 20 minutes per session in sauna, there was a risk reduction among those men.
Dr. Laukkanen
When you heat stress the body, what happens is you activate a signaling pathway called heat shock proteins. They play a very important role in maintaining the three-dimensional structure of a protein, which is important, obviously, for a protein's function...
Host
It is something like the moderate level of physical activity.
Dr. Laukkanen
There are quite limited data on sauna use and warm exposure and these similar outcomes. So there are space to do these kind of research.
Dr. Laukkanen