The hot truth about Finnish saunas

Written by: Bryan Johnson

Published on: May 27, 2025

The hot truth about Finnish saunas

Written by: Bryan Johnson

Published on: May 27, 2025

Hi Friends,

Dry sauna is likely superior to wet sauna

Dry (Finnish) sauna delivers low-humidity heat, so your skin hits 40 °C in minutes while core creeps up only ~1 °C. That gradient shunts up to 70 % more cardiac output to the skin, mimicking moderate-intensity cardio without moving a muscle.

1. Enhanced Blood Flow: The heart pumps up to 70% more blood, similar to intense aerobic exercise (zone 3), with 50-70% of this increased flow re-directed to the skin, promoting vasodilation and improved skin circulation.

2. Increased sweating and detoxification: To maintain a stable core temperature, the skin produces 0.6-1 kg of sweat per hour, facilitating significant detoxification.

3. Improved heat tolerance: The body becomes better at handling heat, leading to a lower core body temperature (offering metabolic advantages) and an increased capacity for efficient sweating in hotter climates.

4. Activation of heat-shock proteins: The skin experiences substantial heat shock protein activation, while a modest 1°C increase in core temperature is sufficient to activate these proteins without the risk of hyperthermia.

5. Longer exposure at higher temperatures: dry saunas are more tolerable for longer durations and at higher temperatures, allowing users to maximize the benefits at minimal risk.

Keep calm and sauna on,

Bryan

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