Heat · The Science

The oldest medicine.

Humans have used heat to heal for millennia. Modern science explains why — and the numbers are striking.

What it is

Sauna, infrared and steam

Traditional saunas heat the air around you to 70–90°C. Infrared cabins use light to warm the body directly at lower air temperatures. Steam rooms add humidity. All raise core temperature, trigger sweating and place a controlled, repeatable load on the cardiovascular system — a workout for your heart you can take lying down.

The mechanism

What happens inside the body

Cardiovascular load

Heat raises heart rate and dilates blood vessels, mimicking moderate exercise. Over time this trains the cardiovascular system and lowers blood pressure.

Heat-shock proteins

Heat stress switches on heat-shock proteins that help cells repair and protect themselves — part of the longevity story.

Circulation & recovery

Increased blood flow delivers oxygen and nutrients to muscle and clears waste, easing stiffness and aiding recovery.

Nervous-system reset

Heat promotes relaxation and a parasympathetic shift, lowering stress and supporting sleep.

The evidence

What the research actually shows

63%

Lower risk of sudden cardiac death in men using a sauna 4–7×/week versus once a week

50%

Lower risk of fatal cardiovascular disease at 4–7 sessions per week

70–90°C

Typical traditional sauna temperature; infrared works lower and gentler

20.7 yrs

Median follow-up of the 2,315-man Finnish sauna study

The standout evidence comes from a 20-year study of 2,315 Finnish men. Compared with once-a-week users, those taking a sauna 4–7 times a week had a 63% lower risk of sudden cardiac death and a 50% lower risk of fatal cardiovascular disease — with even 2–3 sessions a week showing meaningful benefit. The effect tracked with frequency and duration, consistent with heat acting like a cardiovascular training stimulus.

Sources: Laukkanen et al. — sauna bathing & cardiovascular mortality (prospective cohort)

What it delivers

Why facilities invest

Heart healthA repeatable cardiovascular stimulus linked to lower cardiac risk.

RecoveryImproved circulation eases muscle stiffness and soreness.

RelaxationA parasympathetic shift that lowers stress and supports sleep.

ResilienceHeat-shock proteins support cellular repair and adaptation.

SkinSweating and blood flow support a healthy, clear complexion.

Signature offerSauna and steam anchor any serious recovery space.

How it's used

Protocols that work

For cardiovascular benefit: roughly 15–20 minutes at traditional temperatures, several times a week.

Infrared: longer, gentler sessions at lower air temperature suit those who find traditional heat intense.

Frequency is the strongest lever — the cardiac benefits scaled with sessions per week.

Pairs powerfully with cold for contrast therapy.

Stay hydrated. Anyone with a cardiovascular condition, or who is pregnant, should consult a doctor before regular sauna use.

The systems

Bring heat into your space.

Traditional saunas, infrared cabins and steam rooms — specified and installed to your facility.

Explore the range →

This page is educational and summarises published research on heat exposure. It is not medical advice.