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I had spirometry to measure forced expiratory volume in one second (FEV1) and the forced vital capacity (FVC) - the total amount that can be forcibly breathed out.
This is a before & after test, with the after being 12 or so puffs on a salbutamol inhaler, and a 15 minute wait*.
I had something like a 15 %- 20% increase incapacity after using the puffer.
It's very rare that I have an attack, and it's exercise induced (other that when the air quality is shitty), so I avoid using it and train without an inhaler.
I tend to race without too, but only because I forget where I put it.
* Which had me shaking like a meth head going cold turkey.
Did. Not. Feel. Good.
I've recently developed exercise induced asthma - probably brought on by the hot weather and shitty air quality.
It's meant that I can't do nearly as much running or any serious efforts on the bike, and I can end up either a wheezing mess, or a chest spasming wreck.
I've been given a peak flow meter, and am monitoring output before & after salbutamol.
Today was 600 (normal for my height & age is 660). After was 720.
http://www.peakflow.com/top_nav/normal_values/PEFNorms.html
tl;dr I'm entering the TdF with a TUE.