I live in an area with a lot of steep, punchy hills that create the situation of going from Z2 to close to a sustained max HR. With both my Garmin Foreunner and Wahoo Tickr Fit (both optical sensors) I frequently run into the problem of my HR reading low when attacking these hills. Often, it’s in the 80 to 90 range, which makes me wonder if it’s reading 100bpm low, perhaps thinking that the quick jump to 190 is in error. Today, for example, while going all out up an 11 to 17% grade, the Wahoo read from the 80s to around 110 the entire time.
Anyone else experienced this problem?