Summary
Katie from Wellness Mama delivers a concise solo episode covering sauna types, benefits, and practical protocols. She traces the history of infrared saunas back to Dr. John Harvey Kellogg in the 1800s and explains the distinction between near-infrared (which excites mitochondrial enzymes via photobiomodulation) and far-infrared (which has more clinical studies supporting detoxification and cardiovascular benefits). The episode covers heat shock proteins and their role in cellular repair, citing a 2018 study from the Journal of the American College of Cardiology showing 63% lower risk of sudden cardiac death with 4-7 weekly sauna sessions. Additional benefits discussed include growth hormone and IGF-1 increases, BDNF production for brain health, anti-inflammatory effects, sleep optimization through post-sauna body temperature drop, and sauna as an exercise mimetic. Katie recommends starting slowly at lower temperatures, working up to 170+ degrees for 20+ minutes, and using sauna in the afternoon for optimal sleep benefits.
Key Points
- Heat shock proteins from sauna use protect cells by assisting in protein folding, transport, and recovery of damaged proteins
- 2018 JACC study: 4-7 weekly sauna sessions associated with 63% lower risk of sudden cardiac death vs once-weekly use
- Harvard review showed potential 40%+ reduction in heart attack risk from frequent sauna use
- Sauna increases growth hormone, IGF-1, and BDNF which support injury healing, anti-aging, and brain health
- Sauna acts as an exercise mimetic, activating similar cardiovascular and metabolic responses as physical exercise
- Afternoon sauna use optimizes sleep by leveraging the post-session body temperature drop that signals sleepiness
- Near-infrared saunas excite mitochondrial energy-producing enzymes; far-infrared has more clinical evidence for detox
- Start slowly at lower temperatures and shorter durations, working up to 170+ degrees for 20+ minutes
Key Moments
Heat shock proteins protect cells through protein folding and repair
Katie explains how sauna use increases production of heat shock proteins that protect cells by assisting in protein folding, transport, degradation, and recovery of damaged proteins, with effects mediated by heat shock factor 1.
"They play a vital role in protecting cells from damage by assisting in protein folding, transport and degradation, and promoting the recovery of damaged proteins."
63% lower sudden cardiac death risk with 4-7 weekly sauna sessions
Katie cites a 2018 JACC study following 1,600+ Finnish men for 21 years showing that 4-7 weekly sauna sessions were associated with 63% lower risk of sudden cardiac death and reduced risk of fatal and non-fatal heart disease events.
"A 2018 study published in the Journal of the American College of Cardiology found that regular sauna use was associated with reduced risk of cardiovascular disease and all-cause mortality."
Sauna increases growth hormone, IGF-1, and BDNF
Sauna use increases anti-aging hormones including growth hormone and IGF-1 for injury healing, and BDNF for brain health. Low BDNF levels may be linked to mental and psychiatric diseases.
"Sauna also can increase several anti-aging hormones, including growth hormones and insulin-like growth factor 1, or IGF-1. And IGF-1 in particular can really help with injury healing."
Afternoon sauna optimizes sleep via body temperature drop
Katie explains how the steep body temperature drop after sauna use triggers sleepiness, and recommends afternoon sauna sessions before dinner for optimal sleep benefits, noting that the body needs a few hours to cool down.
"sauna use can be used strategically for sleep benefits as well. According to Dr. Michael Bruce, who's a clinical psychologist, past podcast guest, and board certified in sleep medicine, the steep drop"
Start slowly and work up to 170+ degrees for 20+ minutes
Katie recommends new sauna users start at lower temperatures for shorter periods and gradually increase, with a target of 170+ degrees for 20+ minutes as the minimum effective dose based on the research.
"Anyone new to sauna, I would recommend starting off gently at a lower temperature for shorter periods and gradually increasing the temperature and duration of sauna use."
