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I have a garmin 405cx which I have used for a couple of years and has alway gave me sensible results. Last night however I went for an easy 10k run (having done a 10 mile the night before). I was running a very easy pace and felt very comfortable all the way round. When I looked at my data though it suggested that my max heart rate was 215??? usually my max heart rate on a tempo run would be 175-180.
Has anyone else had issues like this with a garmin 405 or am I in dire need of an ecg???