Originally Posted by
RChung
But reading your source, "short high-intensity bursts" are defined as:
"micro-intervals" of
less than 15 seconds...
I take this as a confirmation for what I was saying, i.e. don't do high intensity training before zone 2 unless you want to enter a higher zone for 20-30 minutes, although a few seconds at higher intensity won't trigger the metabolism into burning more sugar than fats.
Back to the OP... I'm not sure what hardware he is using to monitor his HR, but probably that hardware would come with its own app?