Did the Vikings Wear Out Adrian Peterson?

Football Outsiders has popularized the "Curse of 270" which states that: "A running back with 370 or more carries during the regular season will usually suffer either a major injury or loss of effectiveness the following year, unless he is named Eric Dickerson."Last year Peterson "only" carried the ball 363 times, short of 370, so he should be in the clear, right? Well, it doesn't really work