Is an infrared sauna actually good for you? What the cardiovascular and recovery research says

TL;DR

The strongest cardiovascular evidence — like the Finnish KIHD cohort published in JAMA Internal Medicine (Laukkanen et al., 2015) — comes from traditional hot-air saunas used 4–7 times a week for decades, not infrared cabins. Infrared saunas do produce measurable short-term drops in blood pressure and some improvements in vascular function in small trials, and they're reasonably well-supported for easing muscle soreness and perceived recovery after exercise. But the "infrared reduces your risk of heart disease by X%" claims you see in marketing are borrowed from a different device entirely. Call this one promising for recovery, thin-to-borrowed for the big cardiovascular claims.

How is an infrared sauna different from a traditional sauna?

A traditional Finnish sauna heats the air around you — typically to 80–100°C (176–212°F) — and you absorb heat by convection and by breathing hot air. An infrared sauna uses panels that emit infrared radiation, which heats your body tissue more directly while the air stays cooler, usually 45–65°C (113–149°F). Proponents describe this as a "gentler" heat because the ambient temperature is lower, but your core temperature and sweat response can still rise meaningfully — that's the actual mechanism behind any benefit, not the infrared wavelength itself. This distinction matters because almost every headline cardiovascular study on saunas — including the one people cite most — used the traditional kind.

What does the cardiovascular research actually show?

The landmark study here is the Kuopio Ischaemic Heart Disease (KIHD) cohort, a prospective study of over 2,300 middle-aged Finnish men followed for roughly 20 years, published by Laukkanen and colleagues in JAMA Internal Medicine in 2015. Men who used a sauna 4–7 times a week had a 50% lower risk of fatal cardiovascular disease compared to those who went once a week, with a clear dose-response relationship. That's a striking finding, and it's the number most infrared sauna marketing quietly leans on. The problem: those saunas were traditional hot-air saunas, the participants were a specific Finnish population with lifelong sauna habits, and the study is observational — it shows association, not proof that sauna use alone caused the lower risk. People who sauna 5 times a week may differ from once-a-week users in fitness, income, and other habits, even after statistical adjustment.

Infrared-specific data is thinner and mostly short-term. A small trial published in the Journal of Human Hypertension and a handful of similar pilot studies show infrared sauna sessions can acutely lower blood pressure and improve flow-mediated dilation (a marker of vascular function) in people with cardiovascular risk factors, over sessions lasting weeks rather than years. These are real, plausible physiological effects — heat exposure dilates blood vessels and mimics some of what moderate cardio exercise does to your circulation — but the studies are small (often under 30 participants), short in duration, and haven't been replicated at the scale of the Finnish cohort work. Nobody has run a 20-year infrared-specific outcomes study, because infrared cabins haven't been mainstream that long.

Does it actually help with muscle recovery and soreness?

This is where infrared sauna use has more direct support. Heat exposure after exercise increases blood flow to muscle tissue, which plausibly helps clear metabolic byproducts and deliver nutrients faster. Small trials on post-exercise infrared sauna use report reduced perceived muscle soreness and modest improvements in subjective recovery scores compared to passive rest, though objective markers like creatine kinase (a blood marker of muscle damage) don't always move as much as the soreness ratings do. That gap — people feeling better without a matching biochemical signal — is common in recovery research generally, and it doesn't make the effect fake, just harder to pin down mechanistically. If you find a 20-minute infrared session after a hard workout genuinely helps you feel looser the next day, that's a legitimate, evidence-consistent effect, even if it's partly about relaxation and parasympathetic wind-down rather than a unique infrared property.

Are there risks or people who should be cautious?

Heat exposure raises heart rate and can cause dehydration, so anyone with unstable cardiovascular disease, low blood pressure, or who is pregnant should talk to a doctor before regular sauna use, infrared or traditional. Overheating and dizziness are the main acute risks, particularly if you combine sauna use with alcohol or come straight off an intense workout without rehydrating. The Laukkanen cohort itself excluded people with serious pre-existing heart failure from some subgroup analyses, which is a reminder that "sauna is good for your heart" doesn't automatically generalize to everyone with cardiovascular disease — for some, the acute strain of heat stress is a real consideration, not a footnote.

FAQ

Q: Can I get the same benefits as the Finnish sauna study from an infrared sauna?
A: Not confirmed. The 2015 JAMA Internal Medicine study used traditional hot-air saunas at high frequency over decades. Infrared cabins produce some similar acute cardiovascular responses, but there's no long-term outcomes study specifically on infrared use to say the mortality benefit transfers.

Q: How often would I need to use an infrared sauna to see a benefit?
A: Most of the small infrared trials used sessions 2–3 times a week for several weeks to see blood pressure and vascular changes. There's no established "dose" for infrared specifically the way there is for traditional sauna frequency in the Finnish cohort.

Q: Is infrared sauna better than a regular sauna for heart health?
A: There's no head-to-head trial establishing that. Traditional saunas have the deeper, longer-running evidence base; infrared has plausible short-term effects but hasn't been tested against traditional saunas directly for hard cardiovascular outcomes.

Q: Is it worth it just for recovery, even if the heart benefits are uncertain?
A: If it helps you feel less sore and you enjoy it, that's a reasonable use case on its own — the recovery evidence, while modest, is more directly relevant to infrared-specific trials than the cardiovascular mortality claims are.

Sources

• Laukkanen T, Khan H, Zaccardi F, Laukkanen JA. "Association Between Sauna Bathing and Fatal Cardiovascular and All-Cause Mortality Events." JAMA Internal Medicine, 2015.
• Imamura M, et al. "Repeated thermal therapy improves impaired vascular endothelial function in patients with heart failure." Journal of the American College of Cardiology (related sauna/heat therapy vascular mechanism work).
• Ohori T, et al. "Effect of repeated sauna treatment on exercise tolerance and endothelial function in patients with chronic heart failure." Hypertension Research.

Medical Disclaimer

This content is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any health-related decisions or using any treatments discussed herein. Results vary by individual.