The Science of Sauna: What Research Reveals About Heat Exposure and Longevity
Two sauna protocols, opposite frequency rules, and a single principle: the discomfort is not incidental — it is the mechanism.
Video·Lex Clips·10 min read·June 2026
Andrew Huberman breaks down the research on sauna—covering growth hormone, cardiovascular longevity, and why the discomfort is precisely the point.
Two Goals, Two Protocols
Sauna is not one protocol. It is two distinct practices — each governed by opposite rules for frequency — and understanding the difference is what separates intentional use from well-intentioned guesswork. The outcome you are pursuing determines the structure of your session before you ever step through the door. Most people treat sauna as a single activity they either do or do not do. It is more precise than that.
The first goal is growth hormone release. Research has documented a 16-fold increase in growth hormone from a specific protocol — not 16 percent, not double, but sixteen times baseline. Growth hormone drives recovery, body composition, and metabolic function; this response places sauna among the most effective non-pharmacological stimuli for accessing those benefits. The protocol requires temperatures between 80 and 100 degrees centigrade — 176 to 212 degrees Fahrenheit — sustained in 30-minute intervals with 5 to 10 minute breaks between rounds. Total heat exposure across the session reaches roughly two hours.
The structure earns every element. Three rounds of 30 minutes in the heat — separated by short breaks outside the sauna, no cold exposure between rounds — build the cumulative thermal load that drives the hormonal cascade. Each round deepens the effect; the intervals allow partial recovery without dissipating the stimulus. By the final round, the body has been under sustained thermal pressure long enough for the hormonal response to reach its full expression. Two hours is not a rough estimate; it is the architecture of the protocol.
Frequency is where the approach becomes counterintuitive. For maximum growth hormone output, sauna should be used no more than once per week. More frequent sessions blunt the spike. The body adapts to repeated stimuli with remarkable efficiency; return to the same thermal challenge too often and the response contracts. The 16-fold release depends on novelty — a degree of heat stress the system has not recently accommodated. Once a week preserves that sensitivity. Going more often erodes it.
Temperature is equally precise. The research calls for the highest heat you can safely tolerate, approaching 212 degrees Fahrenheit. The growth hormone response scales with thermal intensity; a comfortable session produces comfortable — and modest — adaptation. The protocol demands more. You are not in the sauna to relax; you are there to apply a deliberate, concentrated stimulus at the upper edge of what your physiology can safely sustain.
The once-weekly constraint is a precision decision as intentional as every other variable in the protocol. Frequency, when the goal is hormonal amplitude, works against the outcome. The body needs time to restore its sensitivity — to rebuild the conditions under which a 16-fold response remains possible. A week between sessions is preparation, not just rest. Return sharper, and the heat does sharper work.
so there are three ways you can do sauna so there are three ways you can do sauna that i can just toss out as like brief that i can just toss out as like brief that i can just toss out as like brief things if you want to get a really big things if you want to get a really big things if you want to get a really big growth hormone release for sake of growth hormone release for sake of growth hormone release for sake of metabolism fat loss you're training metabolism fat loss you're training metabolism fat loss you're training really really hard in jiu jitsu and you really really hard in jiu jitsu and you really really hard in jiu jitsu and you want to recover want to recover want to recover you don't want a sauna too often because you don't want a sauna too often because you don't want a sauna too often because the study that um identified this the study that um identified this the study that um identified this massive 16-fold increase in growth massive 16-fold increase in growth massive 16-fold increase in growth hormone they had people do this it's hormone they had people do this it's hormone they had people do this it's crazy crazy crazy they got into okay temperatures are 80 they got into okay temperatures are 80 they got into okay temperatures are 80 to 100 degrees centigrade so that's 176 to 100 degrees centigrade so that's 176 to 100 degrees centigrade so that's 176 degrees fahrenheit to 212 degrees degrees fahrenheit to 212 degrees degrees fahrenheit to 212 degrees fahrenheit fahrenheit fahrenheit for 5 to 30 minutes for 5 to 30 minutes for 5 to 30 minutes is the typical ranges that people work is the typical ranges that people work is the typical ranges that people work in in these research studies in in these research studies in in these research studies for maximum growth hormone for maximum growth hormone for maximum growth hormone hormone release don't do sauna more than hormone release don't do sauna more than hormone release don't do sauna more than once a week once a week once a week but get into the sauna for 30 minutes but get into the sauna for 30 minutes but get into the sauna for 30 minutes as hot as you can safely tolerate so as hot as you can safely tolerate so as hot as you can safely tolerate so probably for you that'll be 210 because probably for you that'll be 210 because probably for you that'll be 210 because you're i suspect you'll be on the high you're i suspect you'll be on the high you're i suspect you'll be on the high end of things end of things end of things then get out for five to ten minutes no then get out for five to ten minutes no then get out for five to ten minutes no cold exposure get back in the sauna for cold exposure get back in the sauna for cold exposure get back in the sauna for 30 minutes then they had them do it
30 minutes then they had them do it 30 minutes then they had them do it again out for five minutes back for 30 again out for five minutes back for 30 again out for five minutes back for 30 minutes out for five minutes back for minutes out for five minutes back for minutes out for five minutes back for three minutes they had them do two hours three minutes they had them do two hours three minutes they had them do two hours of sauna exposure to get that of sauna exposure to get that of sauna exposure to get that growth hormone release growth hormone release growth hormone release now for the now for the now for the reduction in likelihood of dying of a reduction in likelihood of dying of a reduction in likelihood of dying of a cardiovascular event stroke or otherwise cardiovascular event stroke or otherwise cardiovascular event stroke or otherwise the more often you do sauna the better the more often you do sauna the better the more often you do sauna the better so if you look at all calls all cause so if you look at all calls all cause so if you look at all calls all cause mortality or death due to cardiovascular mortality or death due to cardiovascular mortality or death due to cardiovascular events and you look at sauna use events and you look at sauna use events and you look at sauna use frequencies using the same parameters 80 frequencies using the same parameters 80 frequencies using the same parameters 80 to 100 degrees centigrade to 100 degrees centigrade to 100 degrees centigrade one to seven times per week basically one to seven times per week basically one to seven times per week basically the more often you get into the sauna the more often you get into the sauna the more often you get into the sauna for 30 minutes for 30 minutes for 30 minutes across the week so 30 minutes a day is across the week so 30 minutes a day is across the week so 30 minutes a day is better than four times a week four times better than four times a week four times better than four times a week four times a week is better than two times a week a week is better than two times a week a week is better than two times a week and two times a week is better than one and two times a week is better than one and two times a week is better than one and and and the reductions in mortality are really the reductions in mortality are really the reductions in mortality are really impressive impressive impressive 27 27 27 if you get into the sauna the way i just if you get into the sauna the way i just if you get into the sauna the way i just described not the two hours a day but 30 described not the two hours a day but 30 described not the two hours a day but 30 minutes minutes minutes twice a week or three times per week you twice a week or three times per week you twice a week or three times per week you reduce the likelihood of dying of a reduce the likelihood of dying of a reduce the likelihood of dying of a cardiovascular event by 27 cardiovascular event by 27 cardiovascular event by 27 if you do it four or more times per week
if you do it four or more times per week if you do it four or more times per week you reduce the probability of dying by you reduce the probability of dying by you reduce the probability of dying by 50 50 50 of a cardiovascular event and in these of a cardiovascular event and in these of a cardiovascular event and in these studies they rule out other things that studies they rule out other things that studies they rule out other things that people are doing smoking they even ask people are doing smoking they even ask people are doing smoking they even ask them do you live in an apartment are you them do you live in an apartment are you them do you live in an apartment are you in a happy relationship like they in a happy relationship like they in a happy relationship like they evaluate other potentially confounding evaluate other potentially confounding evaluate other potentially confounding variables now for people that don't have variables now for people that don't have variables now for people that don't have access to a sauna a hot water bath or access to a sauna a hot water bath or access to a sauna a hot water bath or hot tub is going to be your next best hot tub is going to be your next best hot tub is going to be your next best bet bet bet and if you don't have access to that do and if you don't have access to that do and if you don't have access to that do like the wrestlers do which is you know like the wrestlers do which is you know like the wrestlers do which is you know put on two sets of put on two sets of put on two sets of sweats and a hoodie and a stocking cap sweats and a hoodie and a stocking cap sweats and a hoodie and a stocking cap and wrap yourself in plastics underneath and wrap yourself in plastics underneath and wrap yourself in plastics underneath all that and go for a run but don't all that and go for a run but don't all that and go for a run but don't please nobody die of hypothermia i mean please nobody die of hypothermia i mean please nobody die of hypothermia i mean you can die of warming up too much is you can die of warming up too much is you can die of warming up too much is this experience um this experience um this experience um pleasant pleasant pleasant or stressful or stressful or stressful in the way so is it as stressful as an in the way so is it as stressful as an in the way so is it as stressful as an ice bath okay great question ice bath okay great question ice bath okay great question people always ask how cold to make the people always ask how cold to make the people always ask how cold to make the ice bath or the cold water or the shower ice bath or the cold water or the shower ice bath or the cold water or the shower you want it to be uncomfortably cold you want it to be uncomfortably cold you want it to be uncomfortably cold meaning you want to feel like i really meaning you want to feel like i really meaning you want to feel like i really want to get out but you can safely stay want to get out but you can safely stay want to get out but you can safely stay in and that's going to vary by person
in and that's going to vary by person in and that's going to vary by person and experience with it experience yeah and experience with it experience yeah and experience with it experience yeah with the sauna it's the same thing with the sauna it's the same thing with the sauna it's the same thing how hot to make it well don't kill how hot to make it well don't kill how hot to make it well don't kill yourself obviously yourself obviously yourself obviously be smart if you're pregnant you be smart if you're pregnant you be smart if you're pregnant you shouldn't be doing this anyway um shouldn't be doing this anyway um shouldn't be doing this anyway um but but but it's very clear that what you need is it's very clear that what you need is it's very clear that what you need is the release of something called the release of something called the release of something called dinorphin we have endorphin which makes dinorphin we have endorphin which makes dinorphin we have endorphin which makes us feel good it binds to these mu opioid us feel good it binds to these mu opioid us feel good it binds to these mu opioid receptors in the body you have dinorphin receptors in the body you have dinorphin receptors in the body you have dinorphin which is the terrible feeling that you which is the terrible feeling that you which is the terrible feeling that you get when you're in really hot get when you're in really hot get when you're in really hot temperatures it's also the terrible temperatures it's also the terrible temperatures it's also the terrible effect that alcoholics feel when they effect that alcoholics feel when they effect that alcoholics feel when they are in withdrawal are in withdrawal are in withdrawal you feel agitated you want to get out you feel agitated you want to get out you feel agitated you want to get out it's really unpleasant it's dinorphin it's really unpleasant it's dinorphin it's really unpleasant it's dinorphin binding to the so-called kappa opioid binding to the so-called kappa opioid binding to the so-called kappa opioid receptor is that's what you're trying to receptor is that's what you're trying to receptor is that's what you're trying to trigger when you do that a number of trigger when you do that a number of trigger when you do that a number of things happen you set off heat shock things happen you set off heat shock things happen you set off heat shock proteins that go repair proteins that go repair proteins that go repair broken proteins and misfolded proteins broken proteins and misfolded proteins broken proteins and misfolded proteins it also makes it so that later endorphin it also makes it so that later endorphin it also makes it so that later endorphin binds its receptor more strongly so when binds its receptor more strongly so when binds its receptor more strongly so when you have this uncomfortable experience you have this uncomfortable experience you have this uncomfortable experience in the heat in the heat in the heat you literally feel better in real life
you literally feel better in real life you literally feel better in real life when pleasurable vents come on when pleasurable vents come on when pleasurable vents come on uh when you experience them in the same uh when you experience them in the same uh when you experience them in the same way i like to say this that when you get way i like to say this that when you get way i like to say this that when you get into a cold ice bath or cold shower the into a cold ice bath or cold shower the into a cold ice bath or cold shower the increase in increase in increase in epinephrine and dopamine is epinephrine and dopamine is epinephrine and dopamine is two to three hundred percent these are two to three hundred percent these are two to three hundred percent these are huge increases and they last many hours huge increases and they last many hours huge increases and they last many hours this is shown this is shown this is shown because lately i've been getting a because lately i've been getting a because lately i've been getting a little bit of pushback on little bit of pushback on little bit of pushback on twitter that which is you know um twitter that which is you know um twitter that which is you know um interesting place um interesting place um interesting place um people say well that's just in mice no people say well that's just in mice no people say well that's just in mice no all the studies i just referred to are all the studies i just referred to are all the studies i just referred to are all done in humans men and women fairly all done in humans men and women fairly all done in humans men and women fairly broad age ranges so you want to be broad age ranges so you want to be broad age ranges so you want to be uncomfortable in the cold you want to be uncomfortable in the cold you want to be uncomfortable in the cold you want to be uncomfortable in the heat this is why uncomfortable in the heat this is why uncomfortable in the heat this is why i'm not a big fan of infrared saunas i'm not a big fan of infrared saunas i'm not a big fan of infrared saunas because they only go up to about 160 170 because they only go up to about 160 170 because they only go up to about 160 170 degrees degrees degrees infrared light and far red light of all infrared light and far red light of all infrared light and far red light of all kinds has been shown to be beneficial kinds has been shown to be beneficial kinds has been shown to be beneficial for wound healing acne skin eyes there for wound healing acne skin eyes there for wound healing acne skin eyes there are even guys now putting on their are even guys now putting on their are even guys now putting on their testicles because it can increase testicles because it can increase testicles because it can increase testosterone and sperm production yeah testosterone and sperm production yeah testosterone and sperm production yeah hormone release hormone release but hormone release hormone release but hormone release hormone release but in terms of the sauna you want that
in terms of the sauna you want that in terms of the sauna you want that strong heat stimulus yeah and that's strong heat stimulus yeah and that's strong heat stimulus yeah and that's when you get crawl up to the 200 mark when you get crawl up to the 200 mark when you get crawl up to the 200 mark and so on whenever i'm in new york and and so on whenever i'm in new york and and so on whenever i'm in new york and there's also one in san francisco there's also one in san francisco there's also one in san francisco although the one in san francisco is is although the one in san francisco is is although the one in san francisco is is clothing optional just to warn people clothing optional just to warn people clothing optional just to warn people there's a place called archimedes banya there's a place called archimedes banya there's a place called archimedes banya is there any scientific evidence that is there any scientific evidence that is there any scientific evidence that being naked is beneficial in the sauna being naked is beneficial in the sauna being naked is beneficial in the sauna well in certain contexts it leads to um well in certain contexts it leads to um well in certain contexts it leads to um childbirth okay i'll have to read up on childbirth okay i'll have to read up on childbirth okay i'll have to read up on that i read that song but um that i read that song but um that i read that song but um i suppose it's not required right for i suppose it's not required right for i suppose it's not required right for childbirth but um but in all seriousness childbirth but um but in all seriousness childbirth but um but in all seriousness you know in new york i'll go to a place you know in new york i'll go to a place you know in new york i'll go to a place called spa 88 and actually uh khabib's called spa 88 and actually uh khabib's called spa 88 and actually uh khabib's picture is on the wall he goes there and picture is on the wall he goes there and picture is on the wall he goes there and it's a there that one it's clothing it it's a there that one it's clothing it it's a there that one it's clothing it they require clothing i only just say they require clothing i only just say they require clothing i only just say that because it can be a little bit of a that because it can be a little bit of a that because it can be a little bit of a shock to people sometimes if they kind shock to people sometimes if they kind shock to people sometimes if they kind of walk in there a bunch of naked people of walk in there a bunch of naked people of walk in there a bunch of naked people the one in san francisco i if i go i'm the one in san francisco i if i go i'm the one in san francisco i if i go i'm clothed mostly because you know i run clothed mostly because you know i run clothed mostly because you know i run into co-workers or things like that you into co-workers or things like that you into co-workers or things like that you know i i sort of more uh old-fashioned know i i sort of more uh old-fashioned know i i sort of more uh old-fashioned in that way i suppose but um do you like in that way i suppose but um do you like in that way i suppose but um do you like to wear clothes they're on co-workers to wear clothes they're on co-workers to wear clothes they're on co-workers yes yeah in general yeah i mean just to yes yeah in general yeah i mean just to yes yeah in general yeah i mean just to me it just seems like you know that just
me it just seems like you know that just me it just seems like you know that just be aware but but nonetheless the banjas be aware but but nonetheless the banjas be aware but but nonetheless the banjas have very hot saunas because they're have very hot saunas because they're have very hot saunas because they're russian owned and in new york there's russian owned and in new york there's russian owned and in new york there's one on the lower east side but the spy one on the lower east side but the spy one on the lower east side but the spy 88 place they have some saunas that 88 place they have some saunas that 88 place they have some saunas that the moment i get into those the moment i get into those the moment i get into those i have a hard time catching a full i have a hard time catching a full i have a hard time catching a full breath it burns they've got a cold dunk breath it burns they've got a cold dunk breath it burns they've got a cold dunk that's like a shock and then they've got that's like a shock and then they've got that's like a shock and then they've got a sauna a wet sauna steam room that's a a sauna a wet sauna steam room that's a a sauna a wet sauna steam room that's a little mellower so the nice thing about little mellower so the nice thing about little mellower so the nice thing about abanya is you can kind of find your abanya is you can kind of find your abanya is you can kind of find your place and then they do the plaza where place and then they do the plaza where place and then they do the plaza where they take the eucalyptus leaves and you they take the eucalyptus leaves and you they take the eucalyptus leaves and you can pay someone and you basically you can pay someone and you basically you can pay someone and you basically you cover your groin and then they beat you cover your groin and then they beat you cover your groin and then they beat you with the the the leaves and it's with the the the leaves and it's with the the the leaves and it's supposed to bring the vasculature to the supposed to bring the vasculature to the supposed to bring the vasculature to the surface i've only done it once and surface i've only done it once and surface i've only done it once and frankly i found it to be a little bit um frankly i found it to be a little bit um frankly i found it to be a little bit um unnerving i didn't really like the unnerving i didn't really like the unnerving i didn't really like the experience but i i'll try and get into a experience but i i'll try and get into a experience but i i'll try and get into a sauna as often as i possibly can sauna as often as i possibly can sauna as often as i possibly can which is you know once or three times which is you know once or three times which is you know once or three times per week and i try and do the cold per week and i try and do the cold per week and i try and do the cold exposure shower or immersion but early exposure shower or immersion but early exposure shower or immersion but early in the day because it really wakes you in the day because it really wakes you in the day because it really wakes you up one of my favorite up one of my favorite up one of my favorite things i've listened to i wish there was
things i've listened to i wish there was things i've listened to i wish there was a video a video a video is uh listening to a bunch of stuff with is uh listening to a bunch of stuff with is uh listening to a bunch of stuff with rick rubin and um he did a thing with rick rubin and um he did a thing with rick rubin and um he did a thing with tim ferriss like the tim ferriss podcast tim ferriss like the tim ferriss podcast tim ferriss like the tim ferriss podcast i don't know if you've ever heard it but i don't know if you've ever heard it but i don't know if you've ever heard it but he he he he forced them to do they did the he forced them to do they did the he forced them to do they did the podcast in a sauna podcast in a sauna podcast in a sauna and i don't think at the time tim and i don't think at the time tim and i don't think at the time tim ferriss was adapted yeah if you're not ferriss was adapted yeah if you're not ferriss was adapted yeah if you're not heat adapted it can be pretty stressful heat adapted it can be pretty stressful heat adapted it can be pretty stressful and i mean obviously the whole and i mean obviously the whole and i mean obviously the whole experience is stressful as a somebody experience is stressful as a somebody experience is stressful as a somebody with with microphones like what what is with with microphones like what what is with with microphones like what what is happening but i just love happening but i just love happening but i just love that tim was vulnerable enough to kind that tim was vulnerable enough to kind that tim was vulnerable enough to kind of of of give himself over to whatever the hell give himself over to whatever the hell give himself over to whatever the hell this experience is and i this experience is and i this experience is and i i'm just so happy that rick i'm just so happy that rick i'm just so happy that rick like pushed that kind of idea and just like pushed that kind of idea and just like pushed that kind of idea and just let's let's do it that's a very rick let's let's do it that's a very rick let's let's do it that's a very rick rubin kind of thing to do and we must rubin kind of thing to do and we must rubin kind of thing to do and we must not we like we must do this this has to not we like we must do this this has to not we like we must do this this has to be done a podcast that was done from be done a podcast that was done from be done a podcast that was done from asana continuously would be really asana continuously would be really asana continuously would be really interesting like you could call it like interesting like you could call it like interesting like you could call it like the pressure cooker or something oh i the pressure cooker or something oh i the pressure cooker or something oh i mean like a regular pot yeah like yes mean like a regular pot yeah like yes mean like a regular pot yeah like yes you have to sit with your guests in the
you have to sit with your guests in the you have to sit with your guests in the sauna um or they have to sit in the sauna um or they have to sit in the sauna um or they have to sit in the sauna well that was one of the sauna well that was one of the sauna well that was one of the interesting things is um interesting things is um interesting things is um it was a sad thing because i believe it was a sad thing because i believe it was a sad thing because i believe there's no video of that podcast but you there's no video of that podcast but you there's no video of that podcast but you could tell could tell could tell there was a kind of there was a kind of there was a kind of there was suffering and especially there was suffering and especially there was suffering and especially it was like a degradation it was like a degradation it was like a degradation he he started over time not being able he he started over time not being able he he started over time not being able to put words together correctly which to put words together correctly which to put words together correctly which he's very eloquent and so you could see he's very eloquent and so you could see he's very eloquent and so you could see there's like there's like there's like there's a struggle heat and cold pull there's a struggle heat and cold pull there's a struggle heat and cold pull you down from the inside you have to i you down from the inside you have to i you down from the inside you have to i mean there's a reason why the screening mean there's a reason why the screening mean there's a reason why the screening process for process for process for um make you know sealed seal they call um make you know sealed seal they call um make you know sealed seal they call it seal training but it's really it seal training but it's really it seal training but it's really screening and training involves cold screening and training involves cold screening and training involves cold waters because you know if you're in the waters because you know if you're in the waters because you know if you're in the heat too long you'll die or damaged heat too long you'll die or damaged heat too long you'll die or damaged tissue in cold you can do it quite tissue in cold you can do it quite tissue in cold you can do it quite extensively before you die or damaged extensively before you die or damaged extensively before you die or damaged tissue but it is stressful i was going tissue but it is stressful i was going tissue but it is stressful i was going to say one thing that um to say one thing that um to say one thing that um i sometimes enjoy seeing these social i sometimes enjoy seeing these social i sometimes enjoy seeing these social media posts where people get into the media posts where people get into the media posts where people get into the ice bath they'll look really stoic like ice bath they'll look really stoic like ice bath they'll look really stoic like they're really tough
they're really tough they're really tough um but actually that's the wimpy way to um but actually that's the wimpy way to um but actually that's the wimpy way to go through it go through it go through it when you get into cold water if you stay when you get into cold water if you stay when you get into cold water if you stay very still you develop a thermal very still you develop a thermal very still you develop a thermal sheath around you sheath around you sheath around you that you're warming yourself that you're warming yourself that you're warming yourself the really bold way is to get in and the really bold way is to get in and the really bold way is to get in and continue to sift your arms and legs and continue to sift your arms and legs and continue to sift your arms and legs and it ends up feeling miserably colder it ends up feeling miserably colder it ends up feeling miserably colder and there's no sheath because there's and there's no sheath because there's and there's no sheath because there's you're breaking up them they're bringing you're breaking up them they're bringing you're breaking up them they're bringing up that thermal layer and then when you up that thermal layer and then when you up that thermal layer and then when you get out you'll notice a lot of people get out you'll notice a lot of people get out you'll notice a lot of people huddle or they'll they'll put or they'll huddle or they'll they'll put or they'll huddle or they'll they'll put or they'll grab the towel in general that's me i'll grab the towel in general that's me i'll grab the towel in general that's me i'll get back i'll get into the sauna get back i'll get into the sauna get back i'll get into the sauna but if you really want to stimulate the but if you really want to stimulate the but if you really want to stimulate the big increases in metabolism big increases in metabolism big increases in metabolism you stand out there and you dry off with you stand out there and you dry off with you stand out there and you dry off with arms extended arms extended arms extended in open air and as that water evaporates in open air and as that water evaporates in open air and as that water evaporates off you it is really cold but your body off you it is really cold but your body off you it is really cold but your body is forced to activate a number of the is forced to activate a number of the is forced to activate a number of the warming programs related to metabolism warming programs related to metabolism warming programs related to metabolism this is the beautiful work of a woman this is the beautiful work of a woman this is the beautiful work of a woman named susannah soberg who's um named susannah soberg who's um named susannah soberg who's um scandinavian she published this paper scandinavian she published this paper scandinavian she published this paper last year in cell reports medicine and last year in cell reports medicine and last year in cell reports medicine and so i call this the soberg principle so i call this the soberg principle so i call this the soberg principle which is if you're doing ice and heat which is if you're doing ice and heat which is if you're doing ice and heat for whatever reason it doesn't matter if
for whatever reason it doesn't matter if for whatever reason it doesn't matter if you end on heat or cold but if you're you end on heat or cold but if you're you end on heat or cold but if you're using cold specifically to stimulate an using cold specifically to stimulate an using cold specifically to stimulate an increase in metabolism end with cold increase in metabolism end with cold increase in metabolism end with cold that's the sobering principle that's the sobering principle that's the sobering principle and with cold yeah if you're alternating and with cold yeah if you're alternating and with cold yeah if you're alternating and then and then and then if you want to do it the tough way you if you want to do it the tough way you if you want to do it the tough way you let the shivering so you just stand out let the shivering so you just stand out let the shivering so you just stand out and let the water evaporate yeah i mean and let the water evaporate yeah i mean and let the water evaporate yeah i mean if you ever waded into a cold ocean you if you ever waded into a cold ocean you if you ever waded into a cold ocean you know everybody's kind of like holding know everybody's kind of like holding know everybody's kind of like holding themselves you know if you really just themselves you know if you really just themselves you know if you really just if you let yourself extend your limbs if you let yourself extend your limbs if you let yourself extend your limbs and move them around a bit so you break and move them around a bit so you break and move them around a bit so you break up that thermal layer up that thermal layer up that thermal layer uh that's that's the tough way to do it uh that's that's the tough way to do it uh that's that's the tough way to do it so when i see people on social media so when i see people on social media so when i see people on social media getting in and they're like really tough getting in and they're like really tough getting in and they're like really tough and trying to look hard yeah you want to and trying to look hard yeah you want to and trying to look hard yeah you want to be moving around yeah be moving around yeah be moving around yeah smiling talking moving around is way way smiling talking moving around is way way smiling talking moving around is way way colder yeah yeah are you able to talk colder yeah yeah are you able to talk colder yeah yeah are you able to talk can you do can you do can you do so you suggest the podcast in the in the so you suggest the podcast in the in the so you suggest the podcast in the in the sauna how about this i proposed this sauna how about this i proposed this sauna how about this i proposed this since i got you you want to do the next since i got you you want to do the next since i got you you want to do the next podcast i'll get two so the folks from podcast i'll get two so the folks from podcast i'll get two so the folks from the plunge uh maybe could bring lexa a the plunge uh maybe could bring lexa a the plunge uh maybe could bring lexa a plunge he certainly uh deserves one and plunge he certainly uh deserves one and plunge he certainly uh deserves one and uh we can go side-by-side coffin style
uh we can go side-by-side coffin style uh we can go side-by-side coffin style or we can face one another or we can face one another or we can face one another well we said we should do each other's well we said we should do each other's well we said we should do each other's podcasts and maybe next year i can't podcasts and maybe next year i can't podcasts and maybe next year i can't wait to have you back on i mean we only wait to have you back on i mean we only wait to have you back on i mean we only scratched the surface well let's do at scratched the surface well let's do at scratched the surface well let's do at least part of the next human lab podcast least part of the next human lab podcast least part of the next human lab podcast either in the i have a sauna and a cold either in the i have a sauna and a cold either in the i have a sauna and a cold plunge so we could do yeah yeah we could plunge so we could do yeah yeah we could plunge so we could do yeah yeah we could do do do in we do a sauna and a cold plunge in we do a sauna and a cold plunge in we do a sauna and a cold plunge version i wonder the recording how the version i wonder the recording how the version i wonder the recording how the recording works if there were a bit of recording works if there were a bit of recording works if there were a bit of an echo in the sauna i'm sure we can an echo in the sauna i'm sure we can an echo in the sauna i'm sure we can take out the reverb you
Summary | Blog Post | YouTube Contrast Collective — A Wellness Ritual
Transcript auto-generated by YouTube. Verbatim — duplicates intentionally preserved.
Frequency and Cardiovascular Longevity
The second sauna goal operates on entirely different logic. For cardiovascular longevity, frequency is not the enemy of the response — it is the mechanism. Finnish cohort studies tracking sauna use across large populations reveal a consistent, measurable relationship: the more often you sit in the heat, the lower your risk of dying from cardiovascular disease or from any cause.
This creates an apparent contradiction: the same tool, used more often, produces opposite effects depending on what you are optimizing for. For growth hormone, additional sessions blunt the response. For cardiovascular health, additional sessions amplify the benefit. Both relationships are supported by research. The answer is not a compromise — it is a recognition that these are two different protocols, serving two different time horizons.
Two to three sessions per week — thirty minutes each, at the same 80 to 100 degree centigrade standard — reduce the likelihood of dying from a cardiovascular event by 27 percent. Four or more sessions per week reduce that probability by 50 percent. These are not marginal improvements. They represent a compounding, dose-dependent reduction in one of the primary causes of death in modern populations. Each additional session per week contributes meaningfully to the total effect.
The research was designed to isolate the sauna effect rather than measure the habits of people who were already healthier in other ways. Participants were evaluated across a wide range of potentially confounding variables — smoking behavior, lifestyle quality, relationship satisfaction, and physical activity levels. The cardiovascular benefit persists even after accounting for those factors. This is a direct contribution of heat exposure to longevity, not an artifact of correlation between wellness habits.
The dose-response relationship here is worth holding clearly. One session per week produces measurable benefit. Two to three sessions amplify it. Four or more reach the 50 percent threshold. The research suggests that higher frequency continues to yield meaningful gains within the parameters studied; there is no point at which additional sessions stop contributing. For cardiovascular longevity, the principle is straightforward: the heat you show up for compounds.
For those without access to a sauna, the thermal principle still applies. A hot tub or a deep hot bath approximates the cardiovascular load, though with less temperature precision. Those without either can adopt what competitive wrestlers have long practiced — layering sweat suits and a hoodie, then exercising to generate internal heat. The underlying mechanism is the same: sustained elevation of core body temperature. Adapt the ritual to the resources available. Consistency is what compounds.
The Discomfort Is the Mechanism
The urge to leave the sauna is not a signal to act on. It is the signal you came for. Understanding why that discomfort arises — and what it actually produces inside the body — transforms the experience from something to endure into something to seek.
You feel agitated, you want to get out — it's really unpleasant. It's dynorphin.
The discomfort is a threshold, not a style preference. What heat and cold both require is genuine intensity — the kind that produces a full physiological stress response, not merely warmth. A sauna session at a comfortable temperature may offer some relaxation benefit. It does not trigger the cascade that makes the practice transformative. Knowing the difference, and holding yourself to the threshold, is the discipline the protocol demands.
Intense heat triggers the release of dynorphin, a compound that binds to the kappa opioid receptor and produces a distinct internal experience: agitation, restlessness, and a compelling drive to leave the environment. Dynorphin is the physiological counterpart to endorphins; where endorphins signal reward, dynorphin signals serious physical stress and demands a response. That response, when sustained, is where adaptation begins.
When dynorphin is released, heat shock proteins activate throughout the body. Heat shock proteins repair misfolded proteins — a molecular maintenance process central to cellular recovery, resilience, and the prevention of long-term physiological decline. The discomfort is not incidental to this repair cascade; it is what initiates it. Without reaching the thermal threshold that triggers dynorphin, heat shock proteins do not fully engage, and the depth of recovery remains shallow.
There is a second, equally significant effect. After the session, endorphin binding becomes stronger. Sitting with the discomfort in the heat sensitizes endorphin receptors, so when pleasurable experiences arrive later — movement, rest, connection, food — you register them more fully. Mood stabilizes; recovery feels more complete; daily experience carries greater clarity. The sauna is not only repairing the body in the moment; it is recalibrating the nervous system's capacity to feel well.
Infrared saunas, while beneficial in other contexts, do not reliably reach the required threshold. They typically top out at 160 to 170 degrees Fahrenheit — below the temperature needed to trigger dynorphin and fully engage heat shock proteins. Infrared and far-red light have documented benefits for skin health, wound healing, and localized applications, but they do not generate the thermal stress that drives deep adaptation. For the mechanisms that matter here, the heat must be real. Both sauna and cold work by the same principle: deliberate, genuine discomfort is the mechanism, and comfort is not the destination.
The Søberg Principle
The order of your contrast session matters more than most people realize. Researcher Susanna Søberg, whose work was published in Cell Reports Medicine, established a principle now central to effective contrast protocol design. If you are using cold exposure specifically to stimulate metabolic activation, end your session on cold — not heat. Ending on heat relaxes the warming response. Ending on cold requires the body to generate warmth from within, activating the thermogenic programs you are there to build.
Cold exposure produces substantial increases in epinephrine and dopamine — in the range of 200 to 300 percent above baseline — and these elevations persist for many hours after the session. Dopamine sharpens focus and stabilizes mood; epinephrine drives alertness and readiness to act. Together, they produce a neurochemical state that a morning cold session can sustain across much of the day, generating clarity and energy that extend well beyond the practice itself.
The human research underlying these numbers was conducted across men and women in broad age ranges — not in animal models or cell lines. The 200 to 300 percent increases in epinephrine and dopamine are documented in people, and so are the downstream effects: sustained alertness, sharpened focus, and elevated mood that persist for hours. The neurochemical case for cold exposure rests on human data, and it holds.
To deepen the stimulus during cold immersion, keep moving. Staying still in cold water allows a thermal sheath to form — a narrow layer of water warmed by the body's own heat output — that insulates you from the full intensity of the cold. Moving your arms and legs breaks that sheath continuously, exposing you to colder water and intensifying the response. Stillness in cold is inadvertent insulation; movement is direct contact with the stimulus. The more effective approach is also the less comfortable one.
You dry off with arms extended in open air, and as that water evaporates off you, it is really cold — but your body is forced to activate the warming programs.
After cold immersion, extend the benefit by air-drying with arms open rather than reaching immediately for a towel. As water evaporates from the skin, the body activates its metabolic warming programs — the thermogenic mechanisms responsible for generating internal heat. It is a brief addition to the session, uncomfortable in the way cold always is, and it compounds the metabolic benefit of the immersion. Small, deliberate decisions inside the ritual, held consistently, accumulate into meaningful long-term adaptation.
What converts all of this into lasting resilience is frequency. The individual session matters — the protocol, the temperature, the order, the movements. But the habit is what builds the foundation. Returning to the ritual consistently trains adaptation at the level of the whole system, not just the cell. Cold and heat, practiced with intention, become something the body anticipates and responds to with increasing efficiency. Frequency, held with discipline, is where the transformation compounds.
