Abnormal heart rate question
More questions from me... I'm full of 'em!
This one's to do with heart rate...
I'm 49, reasonably fit, and I have a fairly low resting HR in the 40s these days, and flat out all-effort max in the low 180s, maybe high 170s now as I've not seen 180 for a few years! 10 years ago I did have a 24 hour raised HR (it stayed at 165 after a football match) and following that I had a load of investigations that showed up nothing apart from a leaky valve, which wasn't considered serious enough to need any treatment.
Over the last 10-15 years or so, since I've been using HR monitors, I've seen a fairly common anomaly, both running back in the days when I still could, and cycling, where early in the session the monitor (and this has been true with about half a dozen different ones over the years) reports my HR way over my maximum... anything from 190 to 240, most commonly in the 195-220 range. I can sometimes (but not always) feel a hard to describe 'odd' feeling in my chest at these times - no pain, just something subtly different to normal.
Today, in the heat and humidity (27C/80F) it was showing over 180 for a total of 5 minutes in 4 separate sections all in the first 12 minutes of riding, and I did feel unreasonably breathless at the time - no hills, no racing, just normal riding. After that it returned to normal (well, given the conditions and my lack of activity recently it was higher than I'd like, but 'normal' as in the 150s and 160s, and i tired rather quickly.
Last year I took HR traces from Sporttracks to my doctor, described the issue, described my mild awareness of symptoms, and showed the traces to illustrate what I meant. He instantly latched onto faulty monitors (all 6 of them?!) and couldn't be persuaded otherwise. He showed no inclination to do anything, no concern, and that was that.
From the reading I've done, this sounds like Atrial Fibrillation... if any of you have experienced similar occurrences and referred this to the medical profession, is the general response "go away, there's nothing to get excited about", or do some take it more seriously? If so, what outcomes have you had?