>>76478653
Because you can feel it, breh. You don't really need a machine let alone a smartwatch even if it's a good one like the one in OP pic, to tell you. How do you know how accurate and reliable is the measure of the watch?
Anyway, as I said you can feel it yourself just pay attention and "listen to your body" I think. Personally I have never ever felt any ache in my hearth, never had or felt out of the chart, extremely high palpitations (and I have done drugs like pills at rave parties, like that one time I took three one after the other cause the first and second ones were lasting too much to hit in so then they hit in all at once and I reached another fucking dimention, where my BPM must have been high as all fuck but ironically you don't feel any pain, or anything physical at all... Cocaine a bunch of times, smoked crack, took 6 scoops of C4 with several pills of modafinil or methilphenidate a bunch of times...).
Do I have any cardiopathy? I don't think so. And yes, I have had hearth studies done.