I had a bad workout today. I was attempting 5 x 1,000 meters on the track. Number one was 3:32, then each one after got slower up to 3:36 by number 4.
My general rule when it comes to intervals is this- if you can't maintain your pace on each rep. within 1-2 seconds it's time to shut down, which is what I did after 4.
Sometimes it's difficult to pinpoint what is going on- not enough recovery, dehydration, depletion, or deconditioning are all possibilities. I did an interval workout two days ago, but in the past I've been able to recover, so maybe I needed an extra day. Or perhaps I am still damaged from that 3 hr 33 min trail run this weekend. I could be dehydrated.
Whatever the cause, I will be running easy for the rest of this week and racing on Saturday- I'll go out cautiously in that race and see how it goes.
Usually it takes a few days to bounce back from one of these. I raced very well in Bellingham 2 weeks ago, but I am not very optimistic I will feel as well on Saturday.