Problem during Interval Training
I consider myself quite an active and fit individual. To give you some background, I am in the military and am very active. Before discovering the Primal Blueprint / Paleo I was obsessed with 'Chronic Cardio' (running 3.6 - 5km per day worth of interval training) with added daily Gym sessions on top.
I recently conducted a very physically taxing course, learning how to instruct physical training for the Army, after which I took a three week holiday (doing no cardio with three times a week strength training).
Now, my problem. I have recently returned to work and conducted one of my Tabata interval training sessions this morning with a friend (using a treadmill, going flat out for 20 seconds with 10 seconds rest, repeat 8 times for 4 minutes of work total). This used to be an enjoyable, do-able work out. However, this morning I had to stop on the third interval as my legs tightened up and would not 'work'. After a quick stretch I jumped back on and was able to complete another 4 before my legs literally stopped working. This was very annoying as, since I consider myself fairly fit, I should be able to complete this session (as I have done multiple times in the past).
My legs have felt stiff (like they need a stretch) during my three week break, however being the silly person that I am I never stretched them. I also think I may not have enough Glycogen in my muscles for this kind of workout, given my transition to a Paleo diet (I have been strict Paleo for nearly 4 weeks - I am doing the 30 day challenge).
My strength training remains unaffected. Can anyone offer some help or insight?
"Contrariwise,' continued Tweedledee, 'if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic."