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The complete guide for mountaineers, hikers, and mountain enthusiasts: physiology, acclimatization, nutrition, psychology, SpO₂ technology, and risk management. Based on 60+ scientific sources.
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The Scientific Guide to Health and Performance in the Mountains
The percentage of oxygen in the air stays 20.9% at any altitude: what changes is the pressure, and with it the oxygen that actually reaches your lungs. At 5,000 m each breath gives you almost half the oxygen of sea level. Understanding how the body adapts is the difference between a safe climb and altitude sickness.
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