do any of you have any issue with training efforts soon after returning from travel?

I had to travel this past week for business, and it sounds like travel will be a regular occurance on this job (just started the job 2 weeks ago). Flew out on Monday (Detroit to Puebla MX), was down there Tues+Wed, and returned Thursday. Due to connections and such, both Monday and Thursday were completely taken up by travel.

I tried doing an interval session on Friday, and basically fell flat on my face after the 2nd set. It was Carmichael's MTB DVD. I felt very strong through the 1st and 2nd set of 30s x 30s, recovering well between the 2 sets. After the 2nd set, my HR wouldn't come down, and I felt like I had to be sick. Aborted the dvd plan, and intended on a 30min tempo effort, but my HR shot up higher than it should've been for the effort. Put the kaibash on the workout after 30min total.

Any thoughts?