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Sauna and Heat Therapy for Relaxation: What the Research Says

Posted on by Just Relax Store

Warm baths get most of the attention in relaxation content, but sauna bathing has its own, distinct body of research — and it’s more substantial than many people realise. Regular sauna use has been linked to cardiovascular and relaxation benefits in studies large enough that Harvard Health and the Mayo Clinic have both reviewed the evidence directly. Here’s what that research actually supports, and how to use heat safely.

What happens in a sauna, physiologically

Harvard Health describes the immediate effect clearly: sitting in a sauna raises your heart rate significantly — the pulse can jump by 30% or more, allowing the heart to nearly double the amount of blood it pumps each minute. That’s a similar cardiovascular workload to moderate exercise, even though you’re sitting still. Your blood vessels near the skin dilate to help dissipate heat, blood flow improves, and you sweat to cool down.

This is different from a hot bath, where the whole body is submerged in water; a sauna surrounds you with hot, dry (or, in a steam sauna, humid) air, generally at higher temperatures, and the cardiovascular response is correspondingly more pronounced.

What the evidence links to regular use

A review published in Mayo Clinic Proceedings found that several studies link frequent sauna use — around four to seven sessions a week in the Finnish studies this evidence largely comes from — to lower blood pressure and a reduced risk of cardiovascular disease, including sudden cardiac death and stroke. Proposed mechanisms include better blood vessel function, improved cholesterol profiles and reduced inflammation observed in frequent sauna users compared with infrequent or non-users.

It’s worth being precise about what this evidence does and doesn’t show: much of it comes from observational population studies (notably from Finland, where regular sauna use is a long-standing cultural habit), which can show strong associations without proving that sauna use alone causes the benefit — people who sauna frequently may also differ in other health habits. Harvard Health’s own framing is appropriately cautious, presenting sauna bathing as a promising, well-studied habit rather than a proven treatment for any condition.

Using heat safely

Both Harvard Health and Mayo Clinic set out similar practical guidance for sauna use:

  • Keep sessions to 15–20 minutes at a time, rather than staying in for extended periods.
  • Rehydrate afterwards — Harvard Health specifically recommends drinking two to four glasses of cool water after each sauna session to replace fluid lost through sweating.
  • Cool down gradually rather than moving straight from a hot sauna into intense activity.
  • Avoid alcohol beforehand, or any medication that impairs your ability to sweat, since both increase the risk of dehydration or overheating.
  • Skip the sauna if you’re unwell, particularly with any illness involving fever or dehydration.

Mayo Clinic and Harvard Health both flag the same caution for one group in particular: people with uncontrolled high blood pressure or existing heart disease should check with their doctor before starting sauna use, given the significant cardiovascular demand it places on the body. If you’re pregnant, have a heart condition, or are otherwise medically vulnerable to heat, that conversation should happen before, not after, your first session.

Where sauna fits into a relaxation routine

Beyond the physiological research, the simple act of sitting in warmth, away from screens and obligations, is itself a form of enforced rest — not unlike a warm bath, just with a different physical mechanism and a different evidence base behind it. If you have access to a sauna, whether at a gym, spa or via a home unit, using it as a regular, moderate habit (rather than an occasional extreme session) appears to be where most of the studied benefit lies.

Traditional versus infrared saunas

Not all saunas work the same way. A traditional Finnish sauna heats the air around you to high temperatures, typically 70–100°C, and your body heats up primarily through that hot air and any added steam from water poured on heated stones. An infrared sauna instead uses infrared panels to heat your body more directly, at lower ambient air temperatures, which some people find more comfortable to tolerate for longer sessions.

The Mayo Clinic notes that infrared saunas are a newer and less-studied option compared with the traditional sauna bathing that underlies most of the large Finnish population research. Early evidence suggests some similar benefits — relaxation, and possibly some cardiovascular effects — but the evidence base is considerably thinner than for traditional sauna use, simply because it hasn’t been around, or been studied, for as long. If cardiovascular benefit specifically is your goal, the traditional sauna research is currently the more robust body of evidence to rely on.

The bottom line

Sauna bathing has a genuinely substantial evidence base linking regular, moderate use to cardiovascular and relaxation benefits, reviewed directly by both Harvard Health and Mayo Clinic Proceedings. The caveats are real too: much of the strongest evidence is observational, sessions should be kept to 15–20 minutes with proper rehydration, and anyone with uncontrolled blood pressure or heart disease should get medical advice before starting.

Sources

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