Over the last week both my resting and training HR in 10 BPM higher than usual. At first I thought it was just fatigue or a little sickness. But yesterday it occured and then I had it checked by a nurse twice and a bloodpressure machine. And the 3 medically checked resting HR were in line with what I expect. But the Garmin still gave me 10 beats higher than usual.
Anyone has a take on this?