According to my most recent VO2 max test my Zone 2 training zone is HR 111-121. I can comfortably nasal breathe (while cycling) to HR 140. You’ve said in the past that you assume you are in Zone 2 if you can nasal breathe. Is that specific to you or just a generalization, or could my VO2 max test results be at fault?
As long as I have been checking my CBC (~35 yrs) I have had an MCV 101-106. I am a recreational endurance athlete as an adult. I’ve ruled out hepatic issues and have B12 and folate levels WNL. I also experimented with B12 supplementation IM, SL, and liposomal without change. Do you know of any correlation between endurance exercise and macrocytosis? Aside from quashing my dreams of passing the WADA test and TdF, are you aware of any other tests I could do to determine the cause of this? Long term effects?