My episodes are short - around a minute and happen occasionally while running. I should have added "Paroxysmal" to diagnosis (PSVT), meaning from time to time. They stop when I stop running. Only other times I've had (detected) episodes is on brisk walks and that's rare. I never discussed a trigger point with doctor, as when I've seen it happen (on my Apple Watch) I break into a walk and it goes away. Always has. Yes, a stress test was part of the cardiologist's tests and it triggered episodes. My concern is, if I continue to run the problem could get worst, so don't want to have that happen.
Thanks for your thoughts.