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Sauna & Longevity

1-minute read 30 XP in app 6 cards

Sauna use cuts mortality by 40%

A 20-year Finnish study found that men who used the sauna 4-7 times per week had 40% lower all-cause mortality compared to once-a-week users.

40% lower mortality (4-7x/week)

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What heat does to your body

Tap each adaptation to learn about heat stress responses.

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Fact

Sauna mimics exercise

A sauna session raises heart rate to 120-150 bpm, dilates blood vessels, and improves endothelial function — similar to moderate cardiovascular exercise.

150 bpm heart rate during sauna

True or false

True or False

Sauna use after resistance training reduces muscle growth.

Sauna immediately after weight training reduces muscle gains

Research shows sauna after training actually increases growth hormone release and may support recovery. The heat shock protein response complements strength training.

Fact

Hydrate before, during, after

A 20-min sauna at 80°C drains 0.5-1L of water through sweat. Pre-loading 500ml of water + electrolytes before sauna and replacing 500-1000ml after is non-negotiable. Electrolytes matter as much as the water — sodium losses average 600-1200mg per session. Dizziness, nausea, or post-sauna headache are usually dehydration, not 'detox'.

0.5-1L fluid loss per 20-min session

Takeaway

Key Takeaway

Aim for 4+ sauna sessions per week at 80-100°C for 15-20 minutes. This protocol matches the Finnish data showing maximum longevity benefit.

4x/wk optimal sauna frequency

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