I’ve noticed the same thing, up into Z4 if I push much at all. I wondered if it had something to do with transitioning from a hard Z4 uphill with no breather before heading back down. Following.
I’m wondering how come when going downhill (running), my HR gets fairly high (into Z3) but my RR, Respiratory Rate, is well within comfortable nose breathing (presumably AET)?
Logic would dictate that…
-Going downhill = less work = lower RR but…the Z3 HR is what’s puzzling me…???
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