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Hips take walking in stride; ankles put best foot forward in run
Date:5/24/2011

In a first-of-its-kind study comparing human walking and running motions and whether the hips, knees or ankles are the most important power sources for these motions researchers at North Carolina State University show that the hips generate more of the power when people walk, but the ankles generate more of the power when humans run. Knees provide approximately one-fifth or less of walking or running power.

The research could help inform the best ways of building assistive or prosthetic devices for humans, or constructing next-generation robotics, say NC State biomedical engineers Drs. Dominic Farris and Gregory Sawicki. The co-authors of a study on the mechanics of walking and running in the journal Interface, a Royal Society scientific journal, Sawicki and Farris are part of NC State's Human PoWeR (Physiology of Wearable Robotics) Lab.

A long history of previous studies have focused on the biomechanics of human locomotion from a whole-body or individual limbs perspective. But this study is the first to zoom in on the mechanical power generated by specific lower-limb joints in a single comprehensive study of walking and running across a range of speeds, Sawicki says.

The study shows that, overall, hips generate more power when people walk. That is, until humans get to the point at which they're speed walking walking so fast that it feels more comfortable to run at 2 meters per second. Hips generate 44 percent of the power when people walk at a rate of 2 meters per second, with ankles contributing 39 percent of the power.

When people start running at this 2-meter-per-second rate, the ankles really kick in, providing 47 percent of the power compared to 32 percent for the hips. Ankles continue to provide the most power of the three lower limb joints as running speeds increase, although the hips begin closing the distance at faster speeds.

"There seems to be a tradeoff in power gener
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Contact: Mick Kulikowski
mick_kulikowski@ncsu.edu
919-515-8387
North Carolina State University
Source:Eurekalert

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