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Saw GP. Used their electronic tester and was blowing at 70% of where I should be for my height and age. This is while warm and with no exercise since Saturday's audax so guess it kind of tallies with the shitty 50% results I was getting on the plastic unit after the ride(s).
Now I have yet another visit to Ealing hospital for chest x-ray and she's written me a prescription for Salbutamol.
I thought I might get to 40 before falling apart but looks like this chassis has been ridden into the ground a few years early...
Well, the air is obviously hard to move today, I could only just manage 600 when I got off the rollers :-)
You really need a baseline measure using the same device and technique, the absolute number is relevant but the diagnosis of asthma comes from a marked change caused by one of your triggers, in your case exercising in cold air.