I recently began training for a
marathon after a 4 year hiatus. It seems the more I run/train, I more experience what feels like a skipped heartbeat. It happens occasionally when I'm running, but it happens most often at night, when I am resting (watching TV or in bed). It sometimes happens 4-5 times a minute...sometimes the occurances are spaced out. Agian, the more I run, the more frequent the occurances.