Tag: metrics

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All consumer-grade heart rate monitors have issues. Chest straps are pretty good. The optical captures from wrist (Google Pixel watch, etc.) or finger (Oura ring) are quite a bit less accurate.

I’ve generally just tolerated it—taking the reported data with a grain of salt—but sometimes it would be nice to get good data. Today I did a little experiment with my Google Pixel watch—tightening the strap at the midpoint of my run—and found that it seems to give me pretty good data this way.

A graph of heart rate data, with a distinct break at the mid-point

What you see is my warm-up, followed by 1 mile out and then 1 mile back. The HR shown for the “out” phase (averaging maybe 180 bpm) is ridiculous—what it’s capturing is not my HR, but rather my step rate.

In the second half my HR goes from about 160 to slightly above 170 (gradually rising as I get tired), and that’s probably just about right.

(The standard formula for estimating your maximum heart rate is 220 minus your age, which would give a max HR of 156 for someone of my age. But that’s clearly wrong for me. I pretty regularly see peak HRs of just over 170 that seem entirely legit. I assume that my genes and my training history just give me a higher max HR than typical. Sadly, it doesn’t make me faster, as you can see from my average pace for this run. I was running literally as fast as I thought I could maintain for 2 miles.)

Anyway, I think I can recommend tightening up the Pixel watch band as tight as tolerable, for getting the most accurate data.

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Back at the end of September I came down with West Nile Fever, which made me pretty sick for a long time. The only time in my life before I was that sick for that long was when I had Mononucleosis when I was a freshman in college. That time I was sick for most of the term, and it took several weeks of the Christmas vacation to fully recover.

With West Nile it took about three weeks to recover from the acute phase of the illness. That is, I had a fever constantly for three weeks. Then it took another three weeks to get my energy levels back. For that period I could walk the dog, fix breakfast, and then do one thing, after which I needed to go back to bed and take a nap.

Temperature data from my Oura ring: I first showed a fever on September 25th. My temperature spiked up to a high of 5.3℉ above baseline on October 6th, and didn’t really settle back in to normal until November 6th.

As of a couple of days ago, I think I’m back to full health. I’ve been doing workouts—not as frequently as I’d like, but often enough that I’ve been able to start pushing the weights up again, although not up to what I doing before I was sick. I’ve been for a couple of runs, both of which were harder and slower than I’d like, but were okay—I didn’t feel like I was sick, just like I hadn’t been running enough the past few weeks.

On Sunday I got a Covid booster, so I felt slightly less energetic Monday, but that has already passed.

After too many weeks, I finally feel back to normal!