Was running today - nothing special, DSW, LTHR run - 10 min warm up, 16 min 5.20/km, 10 min cool down. Normally i reach a 130 bpm in the first 10 min, then LTHR pace and i go slowly to my LT HR after 10-12 min on a 5.10 pace. It is 18C warm - no cold weather artifacts to expect.
But not today - still during the warm-up - after the 8th minute my pulse jumps to 172 and stays there plus or minus 2 bpm for the next 5 minutes it stays in zone 5. It doesn't care at all that I'm switching from the base to LT tempo, then, having come to its senses, it jumps to my normal for this pace 145-150 bpm.
This is the first time the watch has lied even with an external pulse sensor. And it is no cadence lock - it was slow acceleration from 164 to 174 spm.
It looks like the watch processes the incoming pulse somehow in its own way and gives out such garbage.
