It could be something as simple as a need to keep up with the aerobic exercise. It could also be exercise-induced asthma.
I get something that feels a lot like what I imagine exercise-induced asthma feels like-- plus a heart rate that doesn't match the level of exertion--if I don't eat well enough before a ride, especially carbs. (I've only noticed it on the trainer, but that's because I think I'm not as diligent at fueling as a I am for an outdoor ride.) However, I nth a pulmonary function test to make sure.




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I used to have major asthma problems and now I don't even take meds for it, ever. I have a rescue inhaler...somewhere
