Jon, can you turn me into a 'definite' rather than a maybe. I see you have planned your blood donation to perfection
there should be a lot of nice new blood cells, especially as Andrew's hilly ride should have incentivised your body to make'em.
(just joking : from cptips.com: The opposite side of this issue is the definite deterioration in performance that results from donating a unit of blood. Research has shown that both VO2max and endurance suffer after blood donation. There is an immediate drop in plasma volume of 7 to 13% which persists for up to 24 hours, and the loss of hemoglobin may not be corrected for several weeks, even with an iron supplemented diet.)