Why did the study collect watch data over seven days?
The model combined light-based pulse and movement signals across multiple days to look for a persistent pattern. It was designed to identify a person's underlying hypertension status, not estimate a precise blood-pressure reading at a single moment.
Answered in
A Week of Watch Signals Could Help Flag Hidden High Blood PressureA Google-led study used seven days of smartwatch signals to screen for hypertension. The results are promising, but the watch is not a diagnosis.
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