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The opposite of what? They can measure an increase the same as everyone, once it is higher than usual.

I think you took my "usual" to mean some kind of population average and not the "usual" heart rate of the person being measured.
I apologize, I misread your message as "Athletes heart rate is higher than usual"
 
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Wow, this is pretty massive news if accurate. Hopefully the technology continues to be put to use in a relatively benign and progressive way that builds upon not only warning someone of the possibility of a potential coronavirus case but of other maladies as well—all while, most importantly, protecting user privacy with the utmost earnestness.

I don’t know that by itself that the heart beat pattern at any given moment can indicate Covid-19. I think that you need a stored history of a few days at least and someone to look for the signs. I don’t think the software can find it by itself because that hasn’t been programmed yet.
 
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