I noticed that the lion's share of my ectopic beats happen during rest. Sometimes I ride my bike for hours and when the elevated heartrate doesn't seem to induce any ectopic beats. It looks like exercise has no effect on my ectopic beats, meaning they're just as likely to occur during rest as during exercise. Stress, on the other hand, does. If I'm stressed out, for example when talking to someone who is making me nervous, I will have premature beats, couplets or NSVT. If I have to give a speech, the same thing happens. I heard that if ectopic beats happen during exercise, they are more ominous. Is this true?