WiFi signals can measure heart rate — no wearables needed "The team ran experiments with 118 participants and found that after only five seconds of signal processing, they could measure heart rate with clinical-level accuracy. At five seconds of monitoring, they saw only half a beat-per-minute of error, with longer periods of monitoring time increasing the accuracy."https://news.ucsc.edu/2025/09/pulse-fi-wifi-heart-rate/Link to short paper: https://bpb-us-e1.wpmucdn.com/sites.ucsc.edu/dist/d/1595/files/2025/05/Pulse_Fi_short_paper_iotdcoss.pdf#PulseFi
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