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@jim1985
On long rides recently (i.e., 6 hours+), i've noticed my heart rate always drops after about 4-5 hours. Is that a sign of FUBAR?
I've been eating a lot on the rides, and drinking a fair bit. No matter how much i've been feulling, I always always always lose power pretty bad in the last hour (so, not long after the drop in HR), even when going out at a not too stupid pace.
Ideas, thoughts, comments?