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@gbj_tester
The good thing about the Garmin Edge is that it will never show a HR above 240bpm, so there's rarely any need to panic :-) As mentioned by others, poor contact or EMI can lead to erroneous readings. If you can feel your heart thumping, you can do your own count to confirm that the Garmin has got a bit over enthusiastic.
And yes, 220-age is bollocks, and my HRmax is pretty much unchanged over 25 years. I think it might be a cautious guide for people starting training with HR without the benefit of decent coaching, it's probably wise to tell 50 year-olds to back off if they hit 170 bpm until they know what they're doing.
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