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Wi-Fi signals used to measure heart rate accurately — signal variations caused by a beating heart enable determining beats per minute

However, these must have skin contact and are typically worn on the finger. Pulse-Fi works remotely, allowing you to monitor ...
XDA Developers on MSN15h

Researchers claim that a Raspberry Pi's Wi-Fi can provide "clinical-level heart rate monitoring" without the need for a wearable

Wi-Fi signals and machine learning can noninvasively process heart rate with clinical-level accuracy in under 5 seconds.