running - pacemaker upper limit and vtach
Had my pacemaker put in for bradycardia/sic sinus syndrome earlier this year. I run a lot, so was eager to get back to it as soon as possible. On follow-up visits, they noted that my pulse had gone above 200 on a few occasions.
Comparing to my Garmin tracking, it looks like when I run my HR quickly gets up to 140, which is the upper pacing limit for the Pacemaker. Then, it is pegged at 140 for most of my run. BUT, sometimes towards the end of the run my heartrate suddenly climbs out and shoots up towards 200, and then takes a while to come back down.
My legs also often feel tired as I am running. One thing that occurred to me is that perhaps because my upper chamber doesn't fire without the pacemaker most of the time, when the pacemaker topped out at 140, but I was exerting effort that might have had my HR normally go higher. Since my heart isn't going to go higher, it stays at 140 -- but that isn't high enough to pump enough blood. And then, perhaps if I keep overdoing it at that rate, that causes the rapid spike to 200?
Anyone else have similar experiences? I know a rep from Medtronix who said that it might make sense to raise the upper limit higher if I am going to be running at this level (and I have a race this weekend). Still waiting for the cardiologist to get back to me, but curious what experiences others have had in how to request adjusting of the pacemaker. I get flutterings in my chest, or very tired legs when running or doing squats, and wondering whether these are things that require more tweaking.