Hello,
I did a running session this morning under -2° and I noticed really odd numbers of the heart rate measurement.
Note that I recently acquired my FR 255, and this is only the 2nd run I'm doing outside (I set up the HR Zones after a big fail in the first run).
See for yourself:
Everything was working fine until 30min. Past that, the HR suddenly dropped below 100bpm which is impossible as I was doing 5x6' runs at 4:36/km. After 2 series, it disappears for a couple of minutes and come back below 100 bpm. At the end of the run, when running slow, seems like it was back to normal.
Any idea what is happenings and if there is any wat to fix it? The HR sensor was one of the reason I bought this watch...
Thanks,