I know for a fact that when I am in good shape and exercising on a regular bases I hardly have any SVT attacks. I still will get them once in a while. When I am not exercising regularly I have the attacks all the time and the palpitations are more frequent as well. I know this because I am one of those people that will be in great shape for half the year, then slack for a couple months at a time for the rest. When I am slacking I have SVT pretty often. We all know our bodies and this works best for me. The cardiologist does not believe there is a connection and he is the professional. But I have had SVT for going on 20 years and my heart lets me know when to get back into shape.
EC: SVT = Supraventricular Tachycardia