Comparison
Between April/May 2020 and August/September 2021....
.... my resting HR went from average 52.4 to 55.3
.... my deep sleep went from average 75.6 to 91.5 minutes
Nightly HRV analysis
Night of Sep 4-5th: Morning HRV was 62 in Elite HRV, 82 in ithlete, 41 in Fitbit, and 64 in HRV logger.
Night of Sep 5-6th: Elite HRV was 66, ithlete was 82, Fitbit was 51, HRV logger was 54. 94% of time HR was below resting.
Sep 6th-7th (but only 6th is shown, due to not downloading Sep 7th data yet...)
Comparison of cheststrap (30 sec sample data smoothed to 5 minute window, Fitbit HRV sampled on 5 minute intervals). Fit looks pretty good.
Recently found out Fitbit records temperature as well. There is a diurnal rhythm, with interesting variations. Sep 4th and 7th were both early morning outdoor exercise (jogging and hiking, respectively).
More temperature details:
The Inspire 2 temperature sensor is at least directionally-accurate!
The nightly data ("Computed Temperature" file) has what looks like temperature in Celsius. For me, it is 31-32 Celsius at night, which is around 90 F. This is the data that is reported as Skin Temperature in Health Metrics.
Interestingly, there is also continuous 24 hour temperature data at 1 minute intervals ("Device Temperature" file). This data appears to be recorded as variation (+/-) from some baseline, as the numbers are always between +3 and -8 for me. Again, probably Celsius. I plotted my data from the last few days, and the times when I was exercising outside in the sun were consistently +2 degrees above other times that I would guess were cooler.
I don't know if the temperature measures are absolutely correct, but they do at least make sense and could potentially be used to identify unexpected temperature anomalies.
If anyone else is trying to download their data, note that you have to request it on the Fitbit account setting website, and then confirm the email.
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