The body responds to an attack by hyperventilating, which essentially means it increases it's breathing rate to compensate for the obstruction that is in the lungs. That is why it is important to exercise regularly, as it will help towards building up the strength of your muscles and in return you have better endurance when your body has to work harder to breath. Your muscles also get more efficient with utilizing oxygen, which is also a good thing.
The good thing is that you were able to compensate for your attack and keep your oxygen levels up. Your oxygen levels should stay above 95% for optimum health.
When you see a 100% on the oximeter, you are getting enough oxygen at the moment but it doesn't mean that your body isn't working hard to maintain that level. The human body is truly amazing..As far as breathing goes, sometimes what reflects on the monitors doesn't show how you feel. Shortness of breath from asthma causes you to breathe faster, often a combination of increased work of breathing as well as anxiety from the sensation of an attack. Your muscles work hard to keep up and they do a great job but if the attack isn't controlled and the lungs get more bronchospastic and the work of breathing becomes great, then the oximeters will show a decrease as oxygen exchange becomes more difficult.
In the beginning of an attack, the sats are usually good..that is the best time to head it off with aggressive treatment before it gets more severe and harder to control. When the doctor listens to your chest at this stage, he or she usually hears wheezing, mostly expiratory in nature or when you exhale.
One thing you should make sure you do is follow up with this attack or exacerbation with your doctor. You may need an adjustment in your meds to help prevent or lessen the frequency of attacks.
Remember I am not a doctor, please take what I say for face value. Your doctor is the best source for advice concerning your care and concerns.
Thanks for your response, you expressed it well, what I was trying to say.