HR Experts - effort v fatigue

Answer is yes and no. Depends on a few things. When I'm fatigued my hr is generally lower when go workout. Often it's not a big deal, but sometimes if it just won't climb after a while, I may shorten the workout. When I'm sick or about to get sick, my hr will be higher than normal. There was a thing I read a while back about the predominance of the type of training one does that determines how your hr reacts to fatigue. Some will see their hr elevated and some will see it lower than normal. I'll dig around and see if I can find it. It might also relate to your hydration levels on that particular day.

x2.  I've personally experienced both higher or lower depending on different factors.  It seems like if I'm dehydrated or don't get enough sleep one or two nights, it's higher.  When it's the result of accumulated training load, it's lower like TJ described.

I have to ask, "Why did you run 15, 6 and 12 miles in consecutive days? "

Depending on how fatigued you are, sometimes you'll get a repressed HR and it won't rise at all, and other times you'll get cardiac drift, where it will keep creeping up even though you aren't pushing too hard.

Ok, let me rephrase: What's the purpose of doing all those miles close together?

I'm just trying to learn something. Thanks.