Hi all, A lot of the running I do is at a low level of intensity - by which I mean about 20 bpm below my lactate threshold. Obviously my average HR over a run can vary a bit (usually around 3 bpm either side of my target HR) and that will affect my speed. That can make it difficult to get a sense of where you are with regards your overall fitness without doing a tempo run or something (which is tricky where I run due to the number of tourists etc.). I was pondering whether there was some way to correlate your HR and pace to come up with some sort of measure that could be used whether you were doing a tempo run or long slow run or whatever. I've got some data going back 3 years or so and have worked out that average HR x pace (minutes per mile) gives a number that can be used to compare runs. Here's a couple of examples.... 28th Feb - did 5.8 miles, at 7.48 a mile, average HR = 127 = 68.79 4th Mar - did 7.3m, at 7.52 a mile, average HR = 123 = 67.19 I'm not that fit at the moment...so when I look back to when I was in better shape... 5.98 miles, at 6.37 a mile, average HR 140 = 64.33 So I know that for me, as the multiple gets down towards 60 I'm getting fitter....and it also means that I can predict to a certain extent what HR I will need for a certain pace or vice versa..... Probably hopelessly flawed as a theory but worth a try... James |