I had similar problems. Mine was caused by sleep apnea. If you snore then you should ask for a sleep study. When you stop breathing your brain sends adrenaline to wake you up, thus the rapid heartrate.Hope this helps.
Nuch
A related discussion,
Cant seem to get a diagnosis.... was started.
Hi! I have had similar issue for 3 years now... still no answers. I have had MRI's, CT's , kidney tests, ect... nothing found except a cardiac arrythmia ( now on atenolol) which suddenly came from nowhere after a very healthy life til now.
Good luck to you... if you find anything please let me know. I would love to hear your story and outcome, so please share. Thanks and best wishes in healing to you.
I agree with the tests thus far, and the echocardiogram is a good initial test to exclude heart disease.
If palpitations, or an abnormal heart rhythm, is suspected, then a 24-hr Holter monitor or cardiac event monitor can be considered. This can determine whether there is a heart rhythm abnormality that requires further cardiac referral.
A stress test, as suggested in the comments, should be considered as well.
These tests can be discussed with your cardiologist.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin Pho, M.D.
KevinMD.com
Twitter.com/kevinmd
Very weird symptoms. Personally, I would stop exercisingsince it triggers the symptoms. Have you tried to get a stress test done? This is where you run on a treadmill while being wired and monitored. I would get your doctor to order you that test. If he refuses, immediately switch to a new doctor. You do not want to ignore this issue; you don't want to ignore anything heart related.