I just went to the doctor for this last week. I could breathe fine during the ride, but when my heart rate got too high, I felt bad after the ride. My chest would feel kind of tingly really deep inside, I couldn't sleep on either side at night and it wasn't much better on my back. I never felt chest tightning or short of breath, just knew a weird feeling in my chest. Oh yes, and I would be extremely tired, which I thought was due to the new cycling routine. The doc did a breathing test and a chest x-ray, both of which turned out negative. She gave me Proventil and told me to take 2 puffs 20 minutes before cycling. She didn't say specifically I had EIA, but when I read the Proventil insert, I figured it out. Many, many athletes have this condition, and it is treatable with the right medication. I feel just fine after three rides since the dr. visit. I have never had asthma in my life, but my father and his sister had asthma. I have plenty of allergies. Hope this helps someone else out there!