New Garmin “High Intensity Exercise” monitoring and what it showed my body is doing

I have an Apple Watch. It doesn’t alert me to periods of high HR, but I was looking at the heart rate data on my phone and i can see plenty of episodes of tachycardia - some of which I was aware of and some of which I wasn’t!
It does seem to correlate with how I am feeling generally with regards to fatigue/energy levels...
It would be very interesting to look at 3 months of our data compared to 3 months of data for well people.
 
An entire week is only 168 hours so I spent half the week, or my entire waking time, with my poor body in a state comparable to high intensity exercise, exercise so vigorous that if I was doing it for real I wouldn’t have breath to speak. And this is while I was pretty much doing nothing but being in bed 24/7.

I think that just indicates that the device isn't measuring what you think it's measuring. Extreme physical exertion probably raised heart rate and resistance to blood flow. I suppose it's possible to have a fast heart rate and low resistance to flow, which would be the same 'power level' as a typical person resting. Thus, despite what the expensive gadget is saying, your body probably isn't being particularly active. If you were doing the equivalent of high intensity exercise, your lungs would have to be pumping a lot of air, yet you didn't mention breathing hard while your readings were high.
 
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