Kinematic and motor variability and stability during gait: effects of age, walking speed and segment height

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dc.contributor.advisor Dingwell , Jonathan B . en_US
dc.identifier.oclc 221356304 en_US
dc.creator Kang , Hyun Gu , 1978 - en_US 2008 -08 -29T00 :11 :14Z 2014 -02 -19T22 :35 :14Z 2008 -08 -29T00 :11 :14Z 2014 -02 -19T22 :35 :14Z 2007 -12 en_US 2008 -08 -29T00 :11 :14Z
dc.identifier.uri http : / /hdl .handle .net /2152 /3799
dc.description.abstract To understand how falls occur during walking in older adults , we need to understand how the nervous system maintains stability , and how aging affects walking . Four studies were conducted to better understand the effect of age on gait . Older adults display higher gait variability compared to young adults , possibly because of their slower walking . We compared gait stability at multiple controlled walking speeds . Greater gait variability in healthy elderly existed independent of slower walking . Their diminished strength and flexibility partly explained this difference . To explain slower walking in the elderly , some have suggested that muscle weakness and stiffness may force people to walk slower . Others have suggested that people choose to walk slower to be more stable . We compared dynamic stability of gait at multiple speeds . Healthy older adults also exhibited more stability at slower speeds , yet walked at speeds comparable to young adults despite the lower strength and flexibility . Therefore , weakness and stiffness may not force healthy older adults to walk slower . The goal of the nervous system during walking may be to maintain stability of superior segments . We tested whether superior segments are more stable than inferior segments during walking . Superior segments exhibited less orbital stability during preferred walking speed , in contrast to previous suggestions . This highlighted the importance of trunk control during gait . The effects of aging on the fluctuations in the muscle activity during gait are not well understood . We quantified the stride -to -stride fluctuations of EMG as a measure of muscle activation patterns in state -space . Variability increased with speed except in the gastrocnemius . Orbital stability was less in older adults , suggesting that deviations in the EMG amplitude pattern were not readily corrected . Less local stability was seen in older adults , suggesting that older adults were more sensitive to perturbations . Together , these findings suggest that trunk control is important during gait . Strength and flexibility deficits help explain higher variability and lower stability in older adults . Future work will need to address the effect of strength interventions , neurophysiological decline on gait stability and fall risk . en_US
dc.format.medium electronic en_US
dc.language.iso eng en_US
dc.rights Copyright © is held by the author . Presentation of this material on the Libraries' web site by University Libraries , The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works . en_US
dc.subject.lcsh Gait in humans en_US
dc.subject.lcsh Older people - -Orientation and mobility en_US
dc.subject.lcsh Falls (Accidents ) in old age en_US
dc.title Kinematic and motor variability and stability during gait : effects of age , walking speed and segment height en_US
dc.description.department Kinesiology and Health Education en_US
dc.identifier.recnum b69903207 en_US
dc.type.genre Thesis en_US
dc.type.material text en_US Doctor of Philosophy en_US Doctoral en_US Kinesiology and Health Education en_US The University of Texas at Austin en_US Kinesiology and Health Education en_US


Kinematic and motor variability and stability during gait: effects of age, walking speed and segment height. Doctoral dissertation, The University of Texas at Austin. Available electronically from http : / /hdl .handle .net /2152 /3799 .

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