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WiFi signals can measure heart rate—no wearables needed
(news.ucsc.edu)
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this post was submitted on 04 Sep 2025
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https://pmc.ncbi.nlm.nih.gov/articles/PMC9921530/
I wouldn't be as sure about that as you are
The article you cite states that accuracy drops to 60% if the enrollment and testing data were collected at different sessions. I imagine the effects of coffee or walking on heart rate would make that even worse.