I don’t use a Forerunner, but I have a Vivosmart activity tracker. I’ve noticed that my reported RHR is different on the tracker vs the Garmin Connect app, and then the RHR changes later in the day. So my RHR on the tracker might be 47 when I wake up, but about 15 min later when I sync to my phone, it could report as 49, or 50, or something else. Rarely do they match. And then, maybe around 4 I might look at the tracker again, and it will report RHR to be something like 42, and synced it might report 46. I find it really strange.
My husband uses the Forerunner, and he finds his RHR upon awakening bounces around, but I don’t think its range is that unusual. His doesn’t seem to change later in the day, though. He hasn’t mentioned a difference between the reported RHR on the watch vs that in GC, but I’m not sure how often he syncs to GC.
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