Suunto ZoneSense
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@Brad_Olwin That absolutely makes sense! And you’re right: When one thinks about it, there are quite a lot parameters that would influence your HR, making fixed Zones really questionable!
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@panadero As stated many times here and in the information on ZS put out by Suunto. Short intervals will not work! This is clear in you DDFA index plot where the DDFA is trending up on the last set of intervals continuously and then remains higher than most of the rest of the run because you are fatigued.
