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Climbing up through the ravine, navigating the tunnels, and generally trying not to crash off the road are all helpful distractions now. The atmospheric pressure levels are significantly less than at the start of the climb, which will affect your performance. The oxygen saturation of haemoglobin determines the content of oxygen in your blood. Which in turn affects your ability to turn the pedals. Once up to around 2,100 metres, oxyhemoglobin saturation begins to decrease rapidly. No matter who you are you will now be deep in the red. Enjoy.

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