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IANAD, but it sounds like tachycardia to me. Best to go and see your GP.
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I have (well, we're pretty certain I do) paraoxysmal tachycardia - maybe have a look at the symptoms of that and see if it's related. When I do really hard efforts (sprints, long VO2 max/anaerobic intervals), sometimes when I'm recovering my heart rate will suddenly shoot through the roof - hitting numbers (on my HR strap) that I can't even reach when I'm at my limit. Hitting 185bpm requires me to be super fresh and practically bringing my lunch up, but when I get a tachycardia episode my heart rate will go from 140bpm to 220bpm instantly, and stay there for a good 30s until the rhythm restores.
From fairly extensive testing (Holter monitor, ECG, blood tests, ultrasound, interview with a cardiologist), we think it's paraoxsymal tachycardia, but benign and not too much to worry myself about.
Definitely see your GP. They don't take this lightly, and nor should you. Hearts are complicated.
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andyp
OllieC
@Sanddancer
Tried again this weekend with a new heart rate strap. Guess I'll be calling the Doc later on today.
Constant effort, heart rate steadily rising and then it felt like a lurch in my chest and the reading instantly went from 175 to 220. I stopped and sat up and tried feeling my pulse manually. I have no real idea of the speed, but I'd guess more like 170, but missing every third beat.