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ExPhysiology
RE: Jakob 3:30!!
Misleading. Yes your hemoglobin and hematocrit drop when you start training, but that is not because you lose any red blood cells, but because your blood volume expands earlier than more than your hemoglobin/hematocrit reponds. You lose absolutely no oxygen carrying capacity because of this, your blood just get slightly diluted. Total hemoglobin mass stays the same (/increases slowly over time) but the concentration drops. Blood volume expansion is a quick and beneficial adaptation that increases your stroke volume, thus helps performance. You can't tell anything about someone's O2 carrying capacity just by looking at % - you have to know the absolute mass of red blood cells / Hb they have.

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