The run started out fine - a 10:30/mile pace with an average heart rate of 137. However after that it started going up.
Perhaps it's still fatigue? Perhaps I'm not drinking enough water? (I'm not working from my office a lot lately, so it's more coffee and sodas than water at the office...and more alcohol at night to recover from the work day ;-)
Luckily, my big project launches in a little over 6 weeks, so if it is fatigue, I know that after June 23, I should be able to get some more rest.