how often to retest resting heart rate

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For those of you who use HRM for your workouts, how often are you retesting you resting heart rate? I cannot find any info on this and know that it is going to change over time depending on how good of shape your in. I don't want my calories burned to be an over estimate because I am not changing the settings regulalry enough. Was thinking every 2 weeks?

Also, if anyone knows of any good links that show where your heart rate should be during various types of exercise for your age/weight/etc. that would be helpful. I have a tendency to push to hard and my HR is spiking above 165, which I am trying to pay more attention too. It is getting better now that I have been working out for a month, but I still push too hard some days.

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