Impulsive ankle push-off powers leg swing in human walking Public Deposited

http://ir.library.oregonstate.edu/concern/articles/f4752m33r

This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the Company of Biologists Ltd and can be found at:  http://jeb.biologists.org/.

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  • Rapid unloading and a peak in power output of the ankle joint have been widely observed during push-off in human walking. Model based studies hypothesize that this push-off to causes redirection of the body center of mass just before touch-down of the leading leg. Other research suggests, that work done by the ankle extensors provides kinetic energy for the initiation of swing. Also, muscle work is suggested to power a catapult-like action in late stance of human walking. However, there is a lack of know edge about the biomechanical process leading to this widely observed high power output of the ankle extensors. In our study, we use kinematic and dynamic data of human walking collected at speeds between 0.5 and 2.5 m/s for a comprehensive analysis of push-off mechanics. We identify two distinct phases, which divide the push-off: First, starting with positive ankle power output, an alleviation phase, where the trailing leg is alleviated from supporting the body mass, and second, a launching phase, where stored energy in the ankle joint is released. Our results show a release of just a small part of the energy stored in the ankle joint during the alleviation phase. A larger impulse for the trailing leg than for the remaining body is observed during the launching phase. Here, the buckling knee joint inhibits transfer of power from the ankle to the remaining body. It appears that swing initiation profits from an impulsive ankle push-off resulting from a catapult without escapement.
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  • Lipfert, S. W., Günther, M., Renjewski, D., & Seyfarth, A. (2014). Impulsive ankle push-off powers leg swing in human walking. Journal of Experimental Biology, 217(8), 1218-1228. doi:10.1242/​jeb.097345
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  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-07-11T19:53:39Z No. of bitstreams: 1 RenjewskiDanielMIMEImpulsiveAnklePush.pdf: 647295 bytes, checksum: 4e1874e0a39693503a1c8804c2ae7bb9 (MD5)
  • description.provenance : Made available in DSpace on 2014-07-11T19:54:05Z (GMT). No. of bitstreams: 1 RenjewskiDanielMIMEImpulsiveAnklePush.pdf: 647295 bytes, checksum: 4e1874e0a39693503a1c8804c2ae7bb9 (MD5) Previous issue date: 2014-04-15
  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-07-11T19:54:05Z (GMT) No. of bitstreams: 1 RenjewskiDanielMIMEImpulsiveAnklePush.pdf: 647295 bytes, checksum: 4e1874e0a39693503a1c8804c2ae7bb9 (MD5)

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