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I did a quick search and didn't find anything so I thought I'd ask. I've been using a Cateye MSC-HR10 heartrate monitor all year and it has worked great up until my last few rides. It will frequently start reading very high. I usually average between 140-170 bpm and up in the 180s when I'm gunning it but lately at times the HRM has started reading 200-245 bpm on the same terrain. What could be causing this problem? Is my HRM screwed?
 
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