The heart rate and in turn sleep tracking is absolutely hopeless. The 6x Pro i had previously worked so much better. But the 7x for example in the last month only tracked 6 nights out of 30 nights. Also, I have checked Physiological Metrics -> Auto Detection -> Max. HR On -> ON. As I was curious for autodetection, so I did a run with HRM Tri, for experiment did some speed interval and get 178 HR, what was recorded as max HR for this run. Later I have checked User Profile -> Heart Rate -> Max. HR is set 175. Why it didn't changed to 178?
IF ECG is really important and you have a fenix 7 , take good care of it , start putting $10 or $20 a month on the side and when the Fenix 7 + or 8 comes out with ECG sell the 7 and use that plus the money you put on the side to purchase the new one. I kept my forerunner 235 for 5 years. I want to get 5 years out of my fenix also.

Status. Enables or disables the wrist heart rate monitor. The default value is Auto, which automatically uses the wrist heart rate monitor unless you pair an external heart rate monitor. NOTE: Disabling the wrist heart rate monitor also disables the wrist-based pulse oximeter sensor. You can perform a manual reading from the pulse oximeter glance.

The Fenix 7 has extremely accurate heart rate monitoring, and you can quickly check your heart rate training zone mid-workout using a colored bar at the top of the screen (Image credit: Future)
During the workout, the average measured HR with the Polar sensor was 120bpm, whereas Fenix 7X never displayed on the watch face anything above 95bpm. It was like "if you don't use me for this workout, I'll ignore the fact that you're having an workout and I'm resting "
tGTruF.
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  • garmin fenix 7 heart rate not working