Catwhoorg said:
Yeah.
Variable
Yes
Probably.
He is also a confessed EPO and blood doper.
My basic understanding is that reduced partial pressure of O2 in a body triggers EPO production to increase RBC production to negate the hypoxia the body is experiencing.
This reduced partial pressure can occur due to things like being at altitude, being unwell, losing blood, etc.
It's also my belief, that because it's EPO increase that stimulates RBC increase (and RBCs start with reticulocytes) retic% is an indicator of EPO production. ie higher retic% = higher EPO presence in the body. Iron utilisation can have a similar impact, but given these guys are elite athletes, I'd prefer to think they are on a good diet, and that iron intake is sufficient.
So I - simplistically, I will admit - expect things like
low Hgb = high -- baseline retic%
baseline Hgb = baseline +/- some % retic%
high Hgb = baseline -- reduced retic%
so the low Hgb and low retic% doesn't make a lot of sense to me - neither does the high Hgb and high retic%.
But the picture it paints is - to my eye - a mess. The timing has been removed and timing adds significant context to the readings. We expect plasma volume expansion over the course of a season and over the course of a 3 week GT.
The context (altitude, sickness, racing, early season, late season) is also missing from the values, so again, IMO you can't really tell anything from the values graphed as they are.
Personally I find the graph useless.