I'm not close enough to biometrics to know what is truly feasible, but I would think you might be able to get SPO2, bpm, EKG, body temperature, maybe even hydration... Then from there you can start building second-order measurements, like how much time you spend at your resting HR, how quickly you return to resting HR, how well your lungs are working, sleep activity. From there maybe you could even extrapolate that data to give feedback. "Dave, your temperature has been gradually increasing the last 36 hours and your skin is unusually clammy, you might be on the verge of a cold" Or maybe "Dave, your SPO2 is falling and your bpm is rising rapidly, you are going into shock, seek medical attention immediately". History is useful for these measurements- what is "normal" is different from person to person, so a running history could let you discover these things earlier.
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I'm not close enough to biometrics to know what is truly feasible, but I would think you might be able to get SPO2, bpm, EKG, body temperature, maybe even hydration... Then from there you can start building second-order measurements, like how much time you spend at your resting HR, how quickly you return to resting HR, how well your lungs are working, sleep activity. From there maybe you could even extrapolate that data to give feedback. "Dave, your temperature has been gradually increasing the last 36 hours and your skin is unusually clammy, you might be on the verge of a cold" Or maybe "Dave, your SPO2 is falling and your bpm is rising rapidly, you are going into shock, seek medical attention immediately". History is useful for these measurements- what is "normal" is different from person to person, so a running history could let you discover these things earlier.