heart rate %

I know this may be an old chestnut which has been covered before but I have been guilty of too much effort and subsequent injury following speed work.

I have a heart monitor and have been encoraged to use it more effectively. It is said that 70% of MHR is ok for most running. So far so good?

I have just been out for a nice steady run (7 miles). I was concsious not to push it and felt really comfortable at 135-140.

My MHR is 182 but I have just read on the RW website that 70% of 180 is 127. At 127 it would feel like a real daudle. Plus, I would be out half the night. For interval work that makes 155 around 80%. Am I to beleive that I am supposed to run at 127. Coz I had better start walking!

What is the formula because I do not know many runners who run at that rate.
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