Date of Award

Spring 1-1-2012

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Advisor

Virginia L. Ferguson

Second Advisor

Rodger Kram

Third Advisor

Jack Zable

Abstract

Previous studies that controlled foot/shoe mass indicate that cushioning provides energetic advantages over running barefoot. Further, running in lightweight shoes has a comparable metabolic cost as running barefoot, suggesting that positive effects of shoe cushioning may counteract negative mass effects. We hypothesized: 1) unshod running would have comparable metabolic costs as running shod and 2) cushioning will lower the metabolic cost of unshod running. Eleven participants ran at 3.35 m/s with mid-foot strike patterns unshod and shod (Nike Free 3.0; ~211 g /shoe) on a rigid treadmill. Subjects also ran unshod on 10 mm and 20 mm thick slabs of ethylene-vinyl acetate (EVA) foam (same as most running shoe midsoles) mounted on the belt. Oxygen consumption and carbon dioxide production volumes quantified metabolic power. Our findings demonstrate that cushioning reduces the metabolic cost of running, and suggest an ideal amount of cushioning (e.g. < 20mm) beyond which metabolic benefits diminish.

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