The Apple Watch may be the most popular smartwatch on the planet, but it still lags behind competitors from Fitbit and Samsung when it comes to sensors. However, a new study from Frontiers in Digital Health (via MyHealthyApple) shows that it might not need them. .

In a pilot study that tracked 33 mostly white female participants, the researchers were able to use heart rate variability data from the ECG sensor on the Apple Watch Series 6 combined with machine learning techniques to develop a stress prediction tool.
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