I am doing a research about wrist wearables in order to understand how they work. They can be used to measure stress levels, just like pupillometry, skin conductance and other related measures can be.

I can understand how they measure heart rate, movement or SpO2, but I can not understand how they count breaths. When it comes to smart T-shirts they are using stretch sensors but on wrist wearable this is not applicable.

Is there an algorithm that can convert HR and SpO2 measurements to an approximate BPM rate? Sorry for the question but I don't have any medical knowledge.

If there is not such an algorithm, I think I am missing a sensor that can do that.

  • Can you provide an example of a device worn on the wrist that counts respirations? The only consumer device I know of is worn on the waist and measures by counting abdominal movement.
    – Carey Gregory
    Sep 25, 2018 at 15:21
  • If you know the heart rate and the SpO2, you can derive the breathing rate. That’s what hospital monitors do. But as @CareyGregory said, a specific example would be nice.
    – Narusan
    Sep 25, 2018 at 17:31
  • For example this one shop.biostrap.com/collections/frontpage/products/biostrap-set
    – alexisicte
    Sep 26, 2018 at 6:57


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