Oh, Onix, I feel your pain!
I've had asthma since I was a kid (I'm 42 now), and for years if I was on a group ride and we came to a hill, you could literally hear me breathing (trying to breathe) all the way up the hill. Even though others said they were maxing out on their heart rates, you couldn't hear them breathe!
Anyway, I tried Albuterol before rides, which helped a little--I had always used it for running. Finally I posted a question about his on RoadBikeReview, and they mentioned a couple of things which helped.
1) Warmups are really important for people with asthma.
2) It's important to take allergy medicine EVERY day, even if I am not having symptoms
3) Go to a doctor!
So,I went to a doctor. He took my blood pressure (92/60), my O2 sats (99) and my resting pulse rate (53) and looked at me and said, "You can't get any better than that!" But, he was a good doctor and sympathized, at least a little, so he gave my Asmanex and told me to give it a try.
The first time I rode with it, the difference was like, night and day! I remember going up a hill, and air was still going into my lungs! "Hey---I can breathe!" I announced.
The next weekend I had an event, the Tour of the Litchfield Hills, mostly hills, hence the name. As a crested one of them, I looked down and was amazed to discover my heart rate was 175 AND I WAS BREATHING FINE! WOW!
It just seemed so much easier than usual!
Anyway, that's my asthma story. I would highly recommend a visit to a doctor. If you can find a Sports medicine doctor, or at least a doctor who is active you might have better luck. It might be trial and error, too--you might need to try different medicines before you find one that really works.
Regarding your maximum heart rate, just wear a heart rate monitor and ride with a group faster than you. On your own it's difficult to really push it to the max.
From years of running and cycling with asthma, I can tell you the better shape you get into, the better off you are. You can almost sort of, get in good enough shape so that the asthma doesnt't kick in.
Good luck to you!



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