A study published in the Journal of Psychopathology and Clinical Science finds that smartwatches purporting to measure stress do not do so accurately. This news isn't going to help Garmin Vivosmart 4 wearers relax.

We investigated the concurrent overlap between self-report and wearable sensor data measuring stress, tiredness, and sleep. For the majority of individuals in our sample, we found that self-report and physiological measures of stress show very weak to no associations. These results raise several questions about differences between data sources and potential measurement issues.

The Guardian summarizes the paper and its conclusions: "devices cannot differentiate between someone being overworked and being excited." 10

Eiko Fried, an author of the study, said the correlation bet

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