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@gbj_tester
Is >200bpm bonkers? No, I can still hit that on a ramp test even at my age. Is a spike of 240bpm in a long stretch of 160bpm readings an indication of HRM error? Yes, usually.
My experience with both Garmin and Polar is that the most common cause of HR spikes is dry contact between the strap and body, either at the start of a workout or because riding in cold dry conditions keeps the skin dry even after a period of exertion. Poor contact can also arise from a loose strap combined with posture, so a HRM which seems to be fine when you're standing suddenly goes haywire when you get on the drops. EMI/RFI is another candidate, some people get consistent aberrant HR readings by riding under HV power lines.