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@deleted
I have a heart condition, arrhythmia, which is quite common. It's getting less frequent as I get older. Sometimes my heart beat skips about and sometimes it races; once it jumped to 240 when I was cycling with a heart rate monitor on and yes that did feel pretty odd and scary. My normal max heart rate at that time was 200. I can usually get it to stop racing by pressing on my eyeballs or pinching my ear lobes; seriously. Something to do with the parasympathetic nervous system or what have you, I wasn't paying much attention to the doctor after he told me it wasn't likely to kill me.