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A comment on Show HN: Every Breath You Take – Heart Rate Variability Training. Parent comment

Re:Show HN: Every Breath You Take – Heart Rate Variability T... by shawnz on Sunday September 17, 2023 @10:13AM (#37545273)
Isn't it possible to estimate breathing rate with any optical heart rate monitor? See https://en.wikipedia.org/wiki/Photoplethysmogram#Monitoring_..., afaik that's how Fitbit, Apple Watch etc do it
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Re:Show HN: Every Breath You Take – Heart Rate Variability T... by kbre93 on Monday September 18, 2023 @03:44AM (#37553421)
Yes it's common to estimate breathing rate based on the oscillations in the heart rate pattern. But estimating it from the chest expansion is a more direct method
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