Passive Knee Assistance Affects Whole-Body Biomechanics during Sit-to-Stand

Sarah Seko, Robert P. Matthew, Raziel Riemer, Ruzena Bajcsy

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The sit-to-stand (STS) motion is an activity of daily living which requires significant torque generation and coordinated movement at multiple joints. It is therefore important to consider the whole-body biomechanics when designing an assistive device for STS. In this study, a passive elastic orthotic was developed which provides bilateral knee extension assistance. Initial human experiments were conducted with two subjects under two foot-placement conditions. The human and device kinematics and dynamics were modelled, allowing for the assessment of the biomechanical effects of the device. The assistance resulted in a decrease in the human knee torque as well as changes in whole-body biomechanics, notably an increase in the linear momentum of the upper body and a decrease in the anterior excursion of the center of mass. These results indicate that single-joint assistance at the knee has the potential to both facilitate successful STS and positively alter whole-body biomechanics.

Original languageEnglish
Title of host publication2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages4440-4444
Number of pages5
ISBN (Electronic)9781538613115
DOIs
StatePublished - 1 Jul 2019
Event41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2019 - Berlin, Germany
Duration: 23 Jul 201927 Jul 2019

Publication series

NameProceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
ISSN (Print)1557-170X

Conference

Conference41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2019
Country/TerritoryGermany
CityBerlin
Period23/07/1927/07/19

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