I picked up a Peak Flow meter from my doctor a few years ago and found it in a bike box as I was rummaging through it this morning. I blew a 450 this morning - somewhat normal for me. Compared to other people my height and age, that's a little low (should be in the 500 range). And with the increased tree pollen in the air, I decided not to leave it to chance and bring and use my inhaler. Earlier this week I had a full on allergy attack thanks to the poplars and junipers reaping in the spring sun.
After having a humble pie today, I checked my air flow when I got back to the car and I blew a meager 350. Not to make excuses - but maybe my lack of air flow prevents oxygen from being carried into my legs and reduces performance? Time to check in with the doc and figure out some proactive things I can do to reduce my asthmatic lungs.