I would be very interested to hear from any of you that exercise a lot and have episodes of hyperventilation along with your asthma. I have read that it is a fairly common concurrent condition. How do you know which it is in the heat of the moment and how to treat it. Along with this, how many of you have normal oximeter readings when in the middle of an asthma attack, another odd fact that asthmatic lungs are extremely good at making use of what oxygen we have in them.