Google Health is a Google unit building health data tools and services, pursuing connected health records and digital health insights amid ongoing product trials and partnerships.
A string of wearable devices are tested for heart-rate accuracy against a Polar H10 chest strap. Readings show varying performance across the Fitbit Air, Samsung/Amazfit watches, and other wearables. Real-time heart-rate data can lag behind chest-based measurements, though calibration improves accuracy over time.