Originally Posted by
semper_citius
It was a while back that I dug through all this but I think it was
this one that pointed to an increase in hematocrit of 4% and RBC count of 9%, and subsequent googling that indicated that an RBC increase of that magnitude could lead to a 5-7% increase in VO2max.
Thanks. I see that the subjects were >60-year-old men with hypogonadism. Maybe that explains the higher than typically reported increase in RBC/hemoglobin, since they were starting from a low level of testosterone.