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http://runningtimes.com/Print.aspx?articleID=19196"Jack Daniels, author of Daniels’ Running Formula, is a coach and exercise physiologist who sometimes runs barefoot on tracks near his Flagstaff, Ariz., home. Some years ago, he conducted studies (never published) on the effects of footwear on oxygen demand. The results were limited but they too suggest that minimal footwear is better.
Much of the work was designed simply to test the effect of shoe weight on performance. (He and his colleagues found a 1 percent increase in aerobic demand for each 100 grams of weight per shoe.)
But they also found that skimpier designs increase performance ... to a point. After that, cutting down the shoe not only failed to reduce the aerobic "cost," but minimalist shoes actually became less efficient.
"Presumably," Daniels says, "[that’s] because to get real light you sacrifice shock-absorbing and energy-return characteristics." (On the track, however, they found improvements all the way down to the most minimal shoes they could devise. Apparently, the nice, resilient surface of a well-built track gave their test subjects all the shock absorption and energy return they needed.)"
