I'm trying to find out whether anybody uses a heart rate monitor during races.
I've only done one 10k so far and used my HRM and the percentages as quoted in Parkers "HRM Training for the Compleat Idiot" as a guide.
75% for Marathon
I ended up going too slow (I felt too comfortable at the end of the race) for me to believe that 85% was right.
Are the percentages right or should I just use the HRM for training and rely on pace rather than heart rate for racing?