I took 3 months off from running (sept-nov '09) for hunting season. I started back on Dec 7, and ramped up slowly training for a 1/2 marathon I ran on Jan 9. In the middle of my second week of training my shins got to where they would cramp up somewhere around 1 mile in and losen up around mile 3. This kinda went off and on throughout my training. They actually did not bother me during my race. But they have cramped up every run since my race. I have not done any speed work (not even for the race training), other than today- I did a half mile of hill repeats after a 1/2 mile warm-up. It is not my shoes- I started w/ Wave Elixer 3s, which I used all last year w/ no problems, and on Dec 25 I switched to Elixer 4s, which is basically the same shoe, plus my shins were cramping before the switch.
I don't know what to do. I went for a group long run last week where they stayed cramped for the first 4 miles before they kinda just went numb... Then I iced them when I got home and took 2 days rest before my next run, which was today.
I did gain weight during my time off, but I did the year before also w/ no problems when I started back.