Sports injuries are a serious bummer, not only do they disrupt well planned training schedules, they are also painful. As luck would have it, "sports" injuries sustained during long sessions of Wii sports video games are painful as well.
A recent letter in "The New England Journal of Medicine details the first documented case of acute “Wiiitis” caused by extended play on Wii tennis. Yep, hours on the virtual court can lead to over use injuries, just like in reality. Well not quite...the Wii games can captivate a player for hours and "unlike in the real sports, physical strength and endurance are not limiting factors," according to the diagnosing physician. I would add to that list weather conditions (sun?) and other players waiting to get some court time can force a game wisely to end.
According to geeksugar, this is not the first Wii related injury. Seems there were some strap malfunctions in some early models. It is also interesting to note, "Nintendinitis" (love the play on words here) became part of the medical vernacular in the 1990s when a doctor used the word to characterize thumb pain brought on by five hours of uninterrupted Nintendo play, by a 35 year female patient.
Once again, it seems like the moral of the tale is one of moderation. So if Wii is your only form of exercise (please say it ain't so, especially with this gorgeous weather) you should treat it like any other form of exercise and warm up! Or at least take some Gatorade breaks to "replenish" your athletic self.