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Is Stress only measured with built-in optical wrist-based heart rate monitor during activities?

Former Member
Former Member

I am using the Polar H7 with my Garmin Forerunner 945 during activities such as Walking, Strength, and just noticed that there is no stress data in the stress chart during these activities. I was wondering if stress is only measured with the built-in optical wrist-based heart rate monitor? Or perhaps stress can be measured with external HRM, but it must be Garmin HRMs? See attached picture.