Possible Injury

Bravo for icing right away, you prevented an inflammatory response from getting worse. Don't know what it is without seeing you but hopefully it is simply a muscle strain, perhaps some tightness in the Achilles. First: stretch that Achilles/calf, 10-20 seconds 1-2 times, once an hour. Don't force it, just to the point that you feel a slight pulling sensation. More is not better in this case, you will get the stretch by spreading so many throughout the day. Second: look at your shoes. Are they severely worn? you might need arch supports in your future. Third: take it easy running the next few weeks. Fourth: if it is not getting better in 3 weeks go see someone. Sometimes a forum member can give the correct answer to a problem but nothing compares to seeing the problem in the flesh. I can tell you from working with many torn Achilles tendons, you do not want this to get worse. But we'll be optimistic now and treat it like an overuse injury. If you find it getting better add resisted calf raises to your program but never forget to stretch.

Thanks for the replies... actually, this was my last race in my sneakers. I had a new pair but hadn't even worn them on a real run yet. I toyed with the idea of running in them, but decided on my old sneakers for one last run... let's hope it really isn't that last run!