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Kerrigan's running shoe paper

Kerrigan's paper: The effect of running shoes on lower extremity joint torques. has caused some discussion in the running community. An author byline-less editorial in Runner's World ( Do Running Shoes Cause Running Injuries? A Few Insights on a Dismal Science) summed it up well. It had some really cool quotes:
*** No one has ever proven that any running shoes prevent running injuries.
*** No one has ever proven that Army boots, basketball shoes or flip flops either increase or decrease running injuries.
*** No one has ever proven that barefoot running prevents running injuries.
*** Indeed, no one will ever prove any of the above. (It would be too complicated and expensive, and the only public health benefit might be fewer inflamed Achilles tendons).
*** Also, no one knows if the incidence of running injuries is increasing, decreasing, or staying the same. There are several simple reasons for this: 1) There's no commonly accepted definition for running injuries; and 2) the running population has changed substantially in the past 25 years (more women, more inexperienced runners, more slow runners, more overweight-obese runners, etc). So any and all comparisons are apples vs oranges.

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