I have got out of my warm bed to post this because it's really bugging me!
Been using a HRM for a few months without really knowing what it was all about, an increase in trainning and enthusiasm has led me to read the mannual and now I am confused.
I have used the 220-age formula then 60% to 80% to get a target zone which comes out at 110 - 147. This is fine but I have previously just been looking at my average heart rate for each run and over the last couple of weeks (When I have been keeping a record) it has constantly been around 163 - I am happy running at this rate and can hold a conversation, so whats going on? am I a freak?