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if you were to do high intensity training up in altitude, and up your VO2 max...

if you were to do high intensity training up in altitude, and up your VO2 max while training here, what would happen to you when go back down towards sea level? I feel like there would be a period where your endurance would be higher but how long before it comes back down to what the training level made it?
Science   Anatomy-And-Physiology   
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Answer #1

At higher altitudes the level of oxygen dissolved in atmospheric air drops significantly.
The low level of oxygen causes decrease in blood oxygen levels. The change in blood gas composition in detected by the chemoreceptors and it stimulates kidneys to release erythropoietin. This causes increase in rbc production. The increased hematocrit levels results in greater efficiency of blood to bind to oxygen and deliver it to the muscles. This will lead increased endurance.
So when a person go back down towards sea level after high intensity training up in altitude, his endurance increases due to increased hematocrit levels. But these effects last only for 2-3 weeks after returning back to sea level. The body once again adapts to the sufficient amount of oxygen it receives from atmosphere and hematocrit levels drop to normal.

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