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@AdsH
Long Z2/3 rides - start out with HR stubbornly low for power zone, end up with it higher. Longer steady state rides I'm at 9-10% 'decoupling'.
According to Friel HR decoupling is a sign of poorer aerobic fitness.
http://home.trainingpeaks.com/blog/article/aerobic-endurance-and-decoupling
or maybe not?
http://www.endurancecorner.com/decoupling
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