I notice the same exact thing in my long runs right around the 2.5 to 3 hour mark. Still feels super easy, but my HR is 5-10 beats higher than AeT. I’ve noticed that this elevated HR is very close to the AeT value I would need to no longer be aerobically deficient.
On my longer runs (over 2:30:00) I find it hard to keep my heart rate in my AeT zone without my pace dropping significantly. It never drifts too high. Normally about 5 beats. When it does drift higher my breathing rate and my perceived effort are low. When I am not watching closely I naturally fall into an easy pace that is higher than my AeT HR (only toward the end of long runs). Should I follow my breath/effort and let my HR drift the addition 5 beats or follow my HR to stay in zone? What is the relationship between cardiac drift and zone training?
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