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. Author manuscript; available in PMC: 2009 Oct 1.
Published in final edited form as: Gait Posture. 2008 Mar 24;28(3):427–433. doi: 10.1016/j.gaitpost.2008.01.016

Figure 1.

Figure 1

Ankle fixation with different arc-shaped rocker bottoms. (a) Arc radius was previously varied by attaching rigid rocker bottoms to a modified pair of walking boots17. (b) Unmodified Aircast (Summit, NJ) PneumaticWalker boots also have rigid rocker bottoms. (c) Net metabolic energy expenditure (cost of walking minus that for quiet standing) varied with arc radius, with a minimum at a radius of about 0.3 (as fraction of leg length, L). The difference above normal was potentially explained by the added mass of the arc foot apparatus, suggesting that ankle fixation need not lead to greater energy expenditure for walking. The right-hand axis is labeled with dimensionless units.