Wow never heard of that b4
I've had it. It's called "exercise induced asthma."
Discounting a respiratory problem, a short, hard cough often seems to be a common response to a chain of PVC's or the start of SVT. I seemed to do that without thinking of doing it, if you know what I mean.
It wouldn't hurt to talk to your MD about this. For one thing, every allergist I know is amazed by the troubles their patients are having this summer. No one has ever seen anything like it. Sometimes, if you have a tendency toward this kind of thing, asthma can be triggered by exercise, and surprisingly often, coughing is the only asthmatic symptom that appears.
My pvcs or pacs can cause me to feel like I need to cough sometimes. Actually coughing helps knock them out of sometimes as well. That said, you could also have an issue with your lungs. I would say if it is excessive and you are finding it hard to breath then maybe go and get checked out.