Can i run with a cardiac event monitor on?

My doctor had me get a 30 day cardiac event monitor because my heart skips beat, goes really fast, or goes out of rhythm sometimes because i was indirectly struck by lightning 2 years ago. I went running yesterday and played the recording back but it seemed like it was all distorted. Is the monitor not able to record it while i'm running because of all the movement? Also, do you know what the pitch is correlated with? The pitch goes down and up but it doesn't seem to be linked with how fast or slow my heart goes. Thanks for any information.