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Sauna effect on heart rate

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Re: Sauna effect on heart rate

#91

Post by jeffbee »

somebodythere wrote: post #59
ricardobayes wrote: post #34

Earlier quoted context omitted.

My take is probably too nuanced here, but the reality is that we don't know. People living in areas with longevity (blue zones), didn't really excercise (as in sports) or take multivitamins. For all we know, it might even come out that regular, gym-style excercise is even worse for longevity. Nordic people tend to live a long life even though they historically didn't have access to fresh vegetables or fruit and bruta…

There is some evidence suggesting that "blue zones" are largely about pension fraud. https://fortune.com/europe/2024/12/14/are-blue-zones-myth-ex...

You're saying that crime leads to longevity? Big if true.

Re: Sauna effect on heart rate

#92

Post by jampekka »

gjulianm wrote: post #69
kyriakosel wrote: post #2

Author here. Methodology upfront because I'd ask the same things: Data: daily records from wearable users who logged sauna sessions via connected apps. Within-person design — each user is their own control, comparing their own sauna-day nights against their own non-sauna-day nights. No cross-user comparisons. Stats: paired t-tests, FDR-corrected p 0.2 threshold for "meaningful effect." Anything below d=0.2 we don't r…

> Effect survives controlling for activity level. How did you control for activity level? Do you have similar BPM plots for the different situations (sauna+exercise, sauna+no exercise, no sauna + exercise, no sauna + no exercise) for a visual representation? > minimum nighttime HR drops ~3 bpm (~5%) What wearables were used? These devices don't usually have enough precision to reliably detect ~3bpm changes. Also, the…

> What wearables were used? These devices don't usually have enough precision to reliably detect ~3bpm changes.

For large sample averages this doesn't really matter.

Re: Sauna effect on heart rate

#93

Post by YmiYugy »

I know that for myself exercise increases my resting heart rate in the short term. It only decreases after a day or two, sometimes more depending on how fatigued I am. I thought that was common, with recovery times obviously decreasing the fitter ones gets.

Re: Sauna effect on heart rate

#94

Post by austinthetaco »

kyriakosel wrote: post #58
methyl wrote: post #33

Earlier quoted context omitted.

> who logged sauna sessions via connected apps It seems you ask participants to log if they went to sauna. Out of curiosity, why is it not simple to also ask for a type?

i was mostly refering to humidity/duration/temperature given that most devices do not report back these values

I'm equally confused as the other person above. Why not just ask participants to report what type of sauna they used? Sure humidity/duration/temp would be awesome to have, but at the very minimum knowing if a dry sauna would get the same results as a traditional steam sauna.

Re: Sauna effect on heart rate

#95

Post by kyriakosel »

gonzalohm wrote: post #84
shevy-java wrote: post #64

Earlier quoted context omitted.

Japan has a +4 years lead of life expectancy over Finland; Norway almost +3 years on Finland. I am not saying this is conclusive per se, but to me the sauna-people-live-forever is not backed up by the data. I would instead reason that, e. g. weight correlates a lot more here.

A lot of Mediterranean countries also have high life expectancy and are the opposite of a sauna culture.

Cyprus summers are like 45C and its almost like a sauna :)

Re: Sauna effect on heart rate

#97

Post by storus »

Can anyone suggest why after covid I can't do Finnish sauna anymore? Prior to that I used to do 1-2x a week a sequence of 5x(10 minutes in sauna + 5 minutes cold water immersion + 10 minutes rest) which was absolutely great for both stress reduction and blood flow. Now if I do 5 minutes in sauna I feel like my skin was burning and I am about to die, and I need to recover for 1 hour from that to be able to just walk away from sauna.

Re: Sauna effect on heart rate

#98

Post by bluGill »

kazga wrote: post #77
mminer237 wrote: post #40

Earlier quoted context omitted.

Edit: I posted this accidentally when editing without noticing. Hypertrophy isn't necessarily a bad thing. I thought I was discarding the comment cuz I realized I was out of my depth. whoops Please ignore my comment, though I will leave it to make the below comments less confusing. Original: You don't want to "work out" your heart though. Cardiac hypertrophy is a bad thing. The benefit of exercise is that your muscle…

Not true. You can't really train your muscles to use less oxygen for the same energy output (what "oxygen-efficiency" would imply). You rather increase their capacity to take up oxygen from the blood and burn it. They will use more oxygen to output more energy. That additional oxygen needs to come from somewhere. Endurance training at the same time trains the heart to deliver more oxygen to the periphery; the primary…

You kind of can - the muscles can use aerobic or anaerobic processes. When you develop brute strength you are training those anaerobic processes. That isn't what OP was talking about, and overall it is much less energy efficient, but it does produce a large burst of energy when needed and you can train your muscles that way.

Re: Sauna effect on heart rate

#99

Post by lazyant »

kyriakosel wrote: post #2

Author here. Methodology upfront because I'd ask the same things: Data: daily records from wearable users who logged sauna sessions via connected apps. Within-person design — each user is their own control, comparing their own sauna-day nights against their own non-sauna-day nights. No cross-user comparisons. Stats: paired t-tests, FDR-corrected p 0.2 threshold for "meaningful effect." Anything below d=0.2 we don't r…

Would a hot tub session (say at 100 - 105 F) be comparable or yield similar results?

Re: Sauna effect on heart rate

#100

Post by gjulianm »

jampekka wrote: post #92
gjulianm wrote: post #69

Earlier quoted context omitted.

> Effect survives controlling for activity level. How did you control for activity level? Do you have similar BPM plots for the different situations (sauna+exercise, sauna+no exercise, no sauna + exercise, no sauna + no exercise) for a visual representation? > minimum nighttime HR drops ~3 bpm (~5%) What wearables were used? These devices don't usually have enough precision to reliably detect ~3bpm changes. Also, the…

> What wearables were used? These devices don't usually have enough precision to reliably detect ~3bpm changes. For large sample averages this doesn't really matter.

It does, specially if the error bars from multiple measurements show higher precision than what would be expected.
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