Summary
Ben Greenfield compares dry sauna versus infrared sauna versus hot tub. Also covers gut health healing strategies and other biohacking approaches.
Key Points
- Dry sauna versus infrared sauna comparison
- Hot tub benefits and considerations
- Gut healing approaches
- Heat exposure optimization
- Combining different heat modalities
Key Moments
Sauna above 212°F linked to dementia risk; sweet spot is 176-211°F for 5-14 min
A 14,000-person study over 39 years found sauna temps above 212°F increase dementia risk, while 176-211°F for 5-14 min, 4-6x/week reduces it.
"But five to 14 minutes that is really not that long. And so now, you know, I'm doing about 10 to 12 minutes, 212 degrees in my dry sauna in the afternoon, jumping into a quick cold plunge for about two minutes at around 33 degrees. And for me, that's just like how I'm kind of starting my afternoon. And it feels And it's also nice to know that A, you don't have to be so hot that there's smoke coming out of your ears. And B, five to 14 minutes is pretty doable for a lot of people. And again, there's that reduced dementia risk, which is incredible. So the other thing that's very interesting regarding saunas is a brand new study. This is hot off the presses in the Journal of Regulatory, Integrative, and Control."
Dry sauna vs infrared vs hot tub: time and temperature tradeoffs
Hot tubs matched sauna for immune and cardiovascular benefits but required 45 min at 105°F vs three 10-min dry sauna rounds at 176°F.
"I already have a bathtub. I can just do hot water immersion and get all the benefits. And that's partially true. But what you should know is that the hot water immersion in the study was 45 minutes at about 105 degrees. That's a long time. That's a chunkier time. The dry sauna, what they actually did was three 10-minute sessions, and it was pretty low temperature compared to what we were just talking about: 176 degrees Fahrenheit."
Related Research
Sauna as a valuable clinical tool for cardiovascular, autoimmune, toxicant- induced and other chronic health problems.
Regular sauna therapy (including far-infrared) appears safe and offers benefits for hypertension, congestive heart failure, chronic pain, chronic fatigue, and environmentally-induced illness.
The multifaceted benefits of passive heat therapies for extending the healthspan: A comprehensive review with a focus on Finnish sauna.
Passive heat therapies including sauna bathing are associated with reduced risk of cardiovascular disease, dementia, respiratory conditions, and all-cause mortality, with dose-response benefits at 4-7 sessions per week.
Sauna bathing is inversely associated with dementia and Alzheimer's disease in middle-aged Finnish men
Men using sauna 4-7 times weekly had 65% lower risk of dementia and 66% lower risk of Alzheimer's disease compared to once-weekly users.
Sauna-Induced Body Mass Loss in Young Sedentary Women and Men
Single sauna session study showing acute cardiovascular benefits including improved heart rate variability and blood pressure responses in young adults.
Clinical Effects of Regular Dry Sauna Bathing: A Systematic Review.
A systematic review of 40 studies found that regular dry sauna bathing is generally well tolerated and associated with benefits for cardiovascular function, pain conditions, and overall well-being, with minimal adverse effects.
Cardiovascular and Other Health Benefits of Sauna Bathing: A Review of the Evidence.
A comprehensive review finds that regular sauna bathing is associated with reduced risk of cardiovascular disease, neurocognitive disease, pulmonary conditions, and all-cause mortality, with benefits following a dose-response pattern.
Acute and short-term efficacy of sauna treatment on cardiovascular function: A meta-analysis.
Meta-analysis of 16 studies found sauna acutely lowers blood pressure by 5-6 mmHg and over 2-4 weeks improves ejection fraction, walking distance, and vascular function in cardiovascular patients.
Sauna bathing is associated with reduced cardiovascular mortality and improves risk prediction in men and women
Finnish study of 1,688 participants showing frequent sauna use (4-7x/week) associated with 40% lower risk of all-cause mortality compared to once weekly use.
Association between sauna bathing and fatal cardiovascular and all-cause mortality events
Finnish men using sauna 4-7 times per week had 40% lower all-cause mortality and 50% lower cardiovascular mortality compared to once-weekly users over 20 years.
