Our expert says:
That number of 234 is often a sign of electrical interference. I don't know why, maybe an engineer could tell us, but my experience with the HRM is that if I ran near a power line or a station, the value was either 234 or 222.
It's probably not anything to worry about, but it still could be. If you feel any shortness of breath, chest pains, any kind of symptom that you're not familiar with, then it's a definite flag that you should pay attention to. Then I'd see someone. But pay attention that value, if it jumps suddenly and then drops down to say 150, 160, then no problem.
If it stays up, or if it goes through the number (eg 150 to 160 to 170 to 180 to 200 to 210) then it's different and less likely an electrical problem.
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