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Three-dimensional motion of the center of mass and energetic cost across a variety of walking speeds : a comparison between adults with and without Down syndrome

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dc.contributor.advisor McCubbin, Jeffrey Allen
dc.creator Agiovlasitis, Stamatis
dc.date.accessioned 2007-08-22T19:56:35Z
dc.date.available 2007-08-22T19:56:35Z
dc.date.copyright 2007-08-15
dc.date.issued 2007-08-22T19:56:35Z
dc.identifier.uri http://hdl.handle.net/1957/6354
dc.description Graduation date: 2008
dc.description.abstract It has been previously suggested that the walking pattern of individuals with Down syndrome is inefficient. This is thought to result from increased instability, particularly in the medio-lateral direction, due to the characteristic joint laxity and muscle hypotonia of individuals with DS. Therefore, this work was an attempt to gain insight into the efficiency of gait in adults with DS by studying their mechanical and metabolic characteristics during treadmill walking. The first study examined the three-dimensional motion of the center of mass (COM) and the spatio-temporal characteristics of adults with and without DS at a variety of walking speeds. Fifteen adults with DS and 15 adults without DS walked on a treadmill at six and seven randomly presented dimensionless speeds (Froude numbers), respectively, during which kinematic data were collected. The range of medio-lateral COM position was greater in participants with DS, but the ranges of vertical COM position and anterior-posterior COM velocity did not differ between the groups. Participants with DS walked with faster steps across all speeds. Their step length was shorter only during slow walking and their step width did not differ from adults without DS. Participants with DS were more variable in medio-lateral and vertical COM position, anterior-posterior COM velocity, and in all spatio-temporal parameters than their controls. The second study examined whether the net VO₂ and the net VO₂ per unit distance across the same walking speeds are different between adults with and without DS. The study also examined the relationship between the energetically optimal walking speed (EOWS) and the preferred walking speed (PWS) in both populations. Respiratory gases were collected from 14 adults with DS and 15 adults without DS as they walked at the same Froude numbers as for the first study. Adults with DS showed a higher net VO₂ and net VO₂ per unit distance, and a slower EOWS compared to adults without DS. The PWS was the same for both groups and did not appear to minimize the net VO₂ per unit distance in adults with DS. It was collectively concluded that the gait of adults with DS possesses several characteristics of inefficiency and has increased energetic requirements. Adults with DS do not prefer to walk at speeds that minimize the metabolic demand. en
dc.format.extent 412538 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.subject Down syndrome en
dc.subject Locomotion en
dc.subject Energetic cost en
dc.subject Optimization en
dc.subject Disability en
dc.subject Instability en
dc.subject.lcsh Gait in humans en
dc.subject.lcsh Down syndrome en
dc.subject.lcsh Walking -- Physiological aspects en
dc.title Three-dimensional motion of the center of mass and energetic cost across a variety of walking speeds : a comparison between adults with and without Down syndrome en
dc.type Thesis en
dc.degree.name Doctor of Philosophy (Ph. D.) in Exercise and Sport Science en
dc.degree.level Doctoral en
dc.degree.discipline Health and Human Sciences en
dc.degree.grantor Oregon State University en
dc.contributor.committeemember Widrick, Jeffrey
dc.contributor.committeemember Pavol, Michael J.
dc.contributor.committeemember Yun, Jookoo
dc.contributor.committeemember Mpitsos, George
dc.contributor.committeemember Oriard, Michael


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