Sauna Therapy

What it is

Traditional Finnish dry sauna: 80–100°C, 5–20% humidity, 15–30 minute sessions, optionally followed by cool-down. Infrared and steam saunas operate at lower temperatures.

Why it matters

The Kuopio cohort (KIHD) showed dose-dependent reductions in fatal cardiovascular events and all-cause mortality with sauna frequency: 4–7 sessions/week associated with ~50% lower fatal cardiovascular events versus 1 session/week, after adjusting for traditional risk factors.

The same cohort has reported associations with reduced dementia incidence, lower blood pressure, and reduced pneumonia incidence.

Likely mechanisms

• Repeated heat exposure activates heat-shock proteins (HSP70, HSP90), improving proteostasis (Loss of proteostasis).
• Acute cardiovascular load resembles moderate exercise: HR rises, endothelial function improves.
• Improved blood-pressure regulation, arterial compliance.
• Possible reductions in inflammatory markers.

Practical guidance

• Start short (10–15 min) if unaccustomed.
• Hydrate well before and after.
• Avoid alcohol around sessions.
• Cool-down between repeats; do not exit straight to cold if not adapted (cardiovascular reactivity).

Safety

• Acute cardiac risk in unstable cardiovascular disease.
• Caution in pregnancy.
• Risk of dehydration in hot climates or with diuretics.

Related entries

Hormesis, Exercise, Cold exposure.