A lot of these "paroxysmal" events are head scratchers. The doctor looks at you, runs an EKG, does a stress test maybe, NOTHING. Everything looks great and he sends you on your way. A couple of days later, you're in the middle of a run or perhaps watching dinner and BAM!! it hits. I had 54 years of this; in my case SVT like littlegreenman1 above. Arrhythmia is not normal, and you should be persistent with your physician until you get him to runs some more tests. A long term (30 day) event monitor worn all the time except for showering stands a good chance of capturing and showing what you're feeling. BTW, what kind of arrhythmia are you feeling?
Oh - my resting ECG shows/showed nothing. Blood work was all good. Echo tech said he would trade hearts with me in a second (and he was 10 years younger).
We caught episodes on an event monitor, but the path was not found until my EP/Ablation.
Is it OK?
I say, "No. It's not OK to have arrhythmia during or after exercise."
Is it common (for those w/ these troubles)?
Probably, yes.
I suffered from (mostly) exercise induced SVT. I'm a runner. It usually came @ about 5 minutes into the run when my HR was settling in to it's normal (at a moderate run) pulse. (for me is upper 160's)
I had a couple episodes (one while road racing) where the SVT came after the run (well, I was probably in SVT for a good hunk of the race too...)
During this time, I would have SVT. Recover myself. Run 10 miles. So, by definition, I was "in shape."
I have both exercise and recovery problems with pvc's and vt runs, but then again there's not much time that I don't have something going on.
Have you had a stress exercise test or other testing to see what's going on? You should have a full cardiac workup outside an ER/A&E setting just to be sure =)
It reads like you have had a complete heart check-up and your doctor didn't find anything to be concerned about. Did you discuss the (undefined in your post) arrhythmia issue with your doctor.
I don't recall ever having any arrhythmia problems during or after exercise unless I was (as now) also suffering from AFib.