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• W2155482208 abstract "Summary Rapid unloading and a peak in power output of the ankle joint has been widely observed during push-off in human walking. Model based studies hypothesize this push-off to cause 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 discussed to power a catapult-like action in late stance of human walking. However, there is a lack of knowledge 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 2.5m/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." @default.
• W2155482208 created "2016-06-24" @default.
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• W2155482208 date "2013-01-01" @default.
• W2155482208 modified "2023-10-15" @default.
• W2155482208 title "Impulsive ankle push-off powers leg swing in human walking" @default.
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• W2155482208 doi "https://doi.org/10.1242/jeb.097345" @default.
• W2155482208 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24363410" @default.
• W2155482208 hasPublicationYear "2013" @default.
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