I’m right with you on this.
I’m 51; heavier than you.
After 6-7 months of repeat respiratory infections, blood tests at the start of Aug showed similarly reduced haemaglobin and iron deficiency (120g/l haemaglobin, red cell count OK (but slightly reduced cell size due to lower Haemaglobin), but lower ferritin (just 7).
Endoscope tests (up and down) showed no internal causes.
I’m prescribed the Iron tablets too, similar dose of ferrous fumarate 305mg x2 a day.
Pharmacist advice was to take with orange juice as the Vit C helps absorption. Also told to take say half an hour or so before food to max the absorption (taken with food is less effective for absorption, but was told that’s still better than not taking at all if you find the tablets upset your stomach - supposedly they can give some people stomach ache.
Dairy / milk really reduces the absorption (pity as I rather like milk !!)
I’m finding I can get say 3 days training then need/want a day off (vs the 5 or 6 days train then a rest day as normal when IM training).
Also I’ve got the ‘top 30% missing’ - I’m feeling that I’m operating at 60-70% or so especially on the bike.
I can still comfortably do a 100+ mile ride in with 8k+ climbing and the legs feel fine at the end . But i can only ride that in zone 2 or maybe bottom end of zone 3 heart rate. No sprinting, no big efforts, i have to just winch up hills. I can’t seem to go over about 130bpm on hilly bike routes at present without being totally out of breath after 20 seconds hard, and the max HR on these rides is about 140 (Normal max HR for me on the tail end of an FTP 20 mins test is 180).
Sample of n=1, I’d say I’m feeling a third of the way back from the worst i was to ‘normal’ after about 4 weeks on the tablets. (Comparing on the bike the same pattern of reduced HR was there say 8 weeks ago but then it was ok at 110bpm but blowing at 120 or above. So a defo improvement of say 15-20bpm higher now to hit the new false ceiling, but I’d normally only have expected the level of rotally out of breath etc at 170+.
At that rate it will be another 2+ months to be fully back ‘on it’. Which chimes well with what my doc indicated (‘a few months’).
I’ve a full distance race in 3 weeks.
I’m expecting to get my arse handed back to me on a plate 🙄
But I’m going to give it a go anyway and see what happens with no expectation by me as to any performance - I’m now treating it as a nice day out swimming (which I’m very comfortable with) and a big bike ride, and then what ever it is on the shuffle and see if i get round.
I’d be interested to know how you go on.
And also why your doc thinks it’s common with runners…my doc is a swim coach, good competitive masters swimmer himself and knows I’m doing tri - but didnt suggest anything to do with sports (his concern was it can oft indicate
internal losses, hence the endoscope exams arranged very quickly for me).
Best of luck with the recovery.