Can't say for sure, did not see your readings. But it's a thing we talked about and tested in our local mx club, and we all get different readings depending on which sport is monitored. Most of us only used the monitor while running/biking but were really surprised on the readings while riding mx, suddenly 40 year old guys with max heart rates on around 180 would get readings of heart rates on 200+ in a 15-20min practise session and they had burned the same amount of calories as if they had run 10Km.
Maybe in enduro the readings would be more correct than in mx, enduro is not that agressive because you need to save energy for the entire race, and there is not the same amount of adrenalin involved.
Are your readings from your racing not different from when you are running or biking?
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