First of all, I wear the watch correctly, neither too tight nor too loose. It cannot slip during training and is far enough away from the wrist ankle.
Training is the repeated ascent and descent of the same mountain.
Question: The relatively correct pulse is displayed up to the 18th minute. From then on, despite the same effort (same incline, relatively same speed), I received heart rate data in the 115 range for over 23 minutes, although the 160 range would be correct? This deviation is extreme and I can no longer do anything with this data!
From the 40th minute onwards, my heart rate is back in the realistic range.
How can this be with a 1,100€ fitness watch? Absolutely unacceptable (Garmin Epix 2; Sapphire Brown Titanium)
Following another Plot (Training) with similar problem.
Beforehand: Yes