The first and second-gen Oura has a set of PPG sensors for tracking heart fee, respiration rate, coronary heart fee variability, and resting coronary heart rate, among other things. While Oura doesn’t have an ECG feature, they assure that their PPG sensors are 99.9% dependable as a medical-grade ECG, supplying you with metrics like resting coronary heart fee and coronary heart rate variability. These sensors also can document your heart fee throughout actions .

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