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That's strangely the complete opposite to me. Before I commuted to work every day via bike (started 6 months ago, haven't been on the train since) I have effectively cycled off my asthma.
Last year I developed what was called "night wheeze" by my doctor, he put it down to allergies, I have hay fever etc. So I had a peak flow which led to me getting a pump, anyway after wheezing my way through the commute for a few months which also brought on exercise related asthma, it just suddenly disappeared. My tight throat/lungs/whistling/wheeze symptoms have stopped and I've never felt better.I'd be really interested in what your doctor has to say about possible causes and how you get as the weather cools off.
tl;dr Would like to avoid the wheeze again because it sucked a bag of dicks.
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.