Overreaching?

Well, today was another day for strides. This time, rather than running at my normal "easy" pace for the individual miles (7.5mph -- 8min/mi) in between the strides, I was running much closer to marathon pace (7:15min/mi). 

After the first stride at 11.5mph, which felt a drop easier than expected, I decided to bump it to 11.7mph for the other strides.

Well, needless to say, after the second time of bumping it up, my HR never dropped back down to any appreciable extent.

Hopefully it didn't take too much out of me for my long run tomorrow. I think I should be fine; despite the fact that it's 16 miles on the treadmill, it's at my easy pace (8min/mi). And my RHR today has stayed in the 40s.