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dc.contributor.authorAu, Samuel K.
dc.contributor.authorWeber, Jeff A.
dc.contributor.authorHerr, Hugh M.
dc.date.accessioned2010-02-24T19:01:49Z
dc.date.available2010-02-24T19:01:49Z
dc.date.issued2009-01
dc.identifier.issn1552-3098
dc.identifier.urihttp://hdl.handle.net/1721.1/51818
dc.description.abstractAt moderate to fast walking speeds, the human ankle provides net positive work at high-mechanical-power output to propel the body upward and forward during the stance period. On the contrary, conventional ankle-foot prostheses exhibit a passive-elastic response during stance, and consequently, cannot provide net work. Clinical studies indicate that transtibial amputees using conventional prostheses have higher gait metabolic rates than normal. Researchers believe that the main cause for these higher rates is due to the inability of conventional prostheses to provide sufficient positive power at terminal stance in the trailing leg to limit heel strike losses of the adjacent leading leg. In this investigation, we evaluate the hypothesis that a powered ankle-foot prosthesis, capable of providing human-like ankle work and power during stance, can decrease the metabolic cost of transport (COT) compared to a conventional passive-elastic prosthesis. To test the hypothesis, a powered prosthesis is built that comprises a unidirectional spring, configured in parallel with a force-controllable actuator with series elasticity. The prosthesis is shown to deliver the high mechanical power and net positive work observed in normal human walking. The rate of oxygen consumption and carbon dioxide production is measured as a determinant of metabolic rate on three unilateral transtibial amputees walking at self-selected speeds. We find that the powered prosthesis decreases the amputee's metabolic COT on average by 14% compared to the conventional passive-elastic prostheses evaluated (Flex-Foot Ceterusreg and Freedom Innovations Sierra), even though the powered system is over twofold heavier than the conventional devices. These results highlight the clinical importance of prosthetic interventions that closely mimic the mass distribution, kinetics, and kinematics of the missing limb.en
dc.language.isoen_US
dc.publisherInstitute of Electrical and Electronics Engineersen
dc.relation.isversionofhttp://dx.doi.org/10.1109/TRO.2008.2008747en
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en
dc.sourceIEEEen
dc.titlePowered Ankle–Foot Prosthesis Improves Walking Metabolic Economyen
dc.typeArticleen
dc.identifier.citationAu, S.K., J. Weber, and H. Herr. “Powered Ankle--Foot Prosthesis Improves Walking Metabolic Economy.” Robotics, IEEE Transactions on 25.1 (2009): 51-66.© Copyright 2009 IEEE.en
dc.contributor.departmentMassachusetts Institute of Technology. Department of Mechanical Engineeringen_US
dc.contributor.departmentMassachusetts Institute of Technology. Media Laboratoryen_US
dc.contributor.departmentProgram in Media Arts and Sciences (Massachusetts Institute of Technology)en_US
dc.contributor.approverHerr, Hugh M.
dc.contributor.mitauthorAu, Samuel K.
dc.contributor.mitauthorWeber, Jeff A.
dc.contributor.mitauthorHerr, Hugh M.
dc.relation.journalIEEE Transactions on Roboticsen
dc.eprint.versionFinal published versionen
dc.type.urihttp://purl.org/eprint/type/JournalArticleen
eprint.statushttp://purl.org/eprint/status/PeerRevieweden
dspace.orderedauthorsAu, S.K.; Weber, J.; Herr, H.en
dc.identifier.orcidhttps://orcid.org/0000-0003-3169-1011
mit.licensePUBLISHER_POLICYen


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