Sweating the small stuff: Newly developed smartwatch measures key stress hormone

Cortisol is well-suited for measurement through wearable devices, according to study co-author Sam Emaminejad, because its concentration levels in sweat are similar to its circulating levels. Credit: Yichao Zhao and Zhaoqing Wang/UCLA

The human body responds to stress, from the everyday to the extreme, by producing a hormone called cortisol.

To date, it has been impractical to measure cortisol as a way to potentially identify conditions such as depression and post-traumatic stress, in which levels of the hormone are elevated. Cortisol levels traditionally have been evaluated through blood samples by professional labs, and while those measurements can be useful …

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