Hey, just checked my Emfit logs
For HR it happens at times, although on a quick glance mine are somewhat spikier and narrower.
E.g. extracted one of them from raw data – basically it’s gone within 40 seconds:
1616462311, 66 , 16.1, 417
1616462315, 90 , 16.2, 443
1616462319, 106, 16.2, 465
1616462323, 110, 16.1, 264
1616462327, 111, 15.8, 127
1616462331, 111, 15.6, 168
1616462335, 108, 15.3, 170
1616462339, 95 , 14.6, 192
1616462343, 90 , 14 , 225
1616462347, 80 , 13.6, 193
1616462351, 63 , 13.8, 277
I also compared with Garmin watch – and it doesn’t seem to catch these (otherwise it’s fairly consistent about HR against Emfit). Could be either Garmin not being quick enough to catch, or it could also be some Emfit artifact? E.g. moving around in sleep or something like that.
UPD: hmm, found a longer high HR period (about 100 for almost 10 minutes) – I think this would have definitely been caught by Garmin. Damn
For breathing rate… indeed, it looks very weird. I haven’t looked at data myself much before, but in the past it was often very patchy – not sure how accurate it is. I looked at mine now and found some similar artifacts. Also weirdly ‘clipped’ at about 25 BPM… and with no corresponding HR change – you’d expect some if you were breathing twice as often, right? Garmin also tracks RR, and there are no such peaks in Garmin, but I’m not sure it’s accurate for RR.
However, I’ve been experimenting with recording sleep audio (want to figure out whether I’m snoring), and I also couldn’t hear any unusual breathing around that time.
I’ll take a closer look, maybe analyse all past data to detect how often these artifacts happen.