Good work @vanessahampton :) I have heard of people getting sick from altitude as low as 7000 ft (2000m) but to be honest never noticed it myself at much higher altitudes. Obviously, there is a large amount of variation between different people's sensitivity at different altitudes, and to how much they are exerting themselves.
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Thank you. True, the sensitivity differs but especially the rate of exertion. The slower they go, the lesser the effect.