[Christian]

Hi Mark, hi everyone,

since my last post I collected some more data. And as promised I want to keep you posted.

More and more I come to believe that there are two sources of negative HR-drift. The first is the warm-up effect you mentioned, Mark, for really low intensities. And the second is not being recovered and having to walk progressively faster to get and keep my HR up. In the second case I observe that I have to go faster and faster to keep my HR up and then I kind of “bounce back” and experience pronounced positive drift a little later.