The news - In the study published in PM&R, lead author D. Casey Kerrigan says "An avg 54 pct increase in the hip internal rotation torque, a 36 pct increase in knee flexion torque, and a 38 pct increase in knee Vs. torque were measured when running in running shoes compared with barefoot."
Is it because - When you run bare foot, torque gets distributed around and up the legs, body manages it naturally, and when you wear the shoes, the cushion effect does not pass on the same to more wider area, creating more concentrated torque?
Read more at - http://blogs.usatoday.com/sciencefair/2010/01/study-high-heels-better-than-running-shoes.html
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