Influence of visual information on optimal obstacle crossing

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dc.contributor.authorRodrigues, Sérgio Tosi [UNESP]
dc.contributor.authorForner-Cordero, A.
dc.contributor.authorGarcia, V. D. [UNESP]
dc.contributor.authorPolastri, Paula Fávaro [UNESP]
dc.contributor.authorFerasoli, H. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:26:09Z
dc.date.available2014-05-20T13:26:09Z
dc.date.issued2009-01-01
dc.description.abstractHuman motion seems to be guided by some optimal principles. In general, it is assumed that human walking is generated with minimal energy consumption. However, in the presence of disturbances during gait, there is a trade-off between stability (avoiding a fall) and energy-consumption. This work analyses the obstacle-crossing with the leading foot. It was hypothesized that energy-saving mechanisms during obstacle-crossing are modulated by the requirement to avoid a fall using the available sensory information, particularly, by vision. A total of fourteen subjects, seven with no visual impairment and seven blind, walked along a 5 meter flat pathway with an obstacle of 0.26 m height located at 3 m from the starting point. The seven subjects with normal vision crossed the obstacle successfully 30 times in two conditions: blindfolded and with normal vision. The seven blind subjects did the same 30 times. The motion of the leading limb was recorded by video at 60 Hz. There were markers placed on the subject's hip, knee, ankle, rear foot, and forefoot. The motion data were filtered with a fourth order Butterworth filter with a cut-off frequency of 4 Hz. The following variables were calculated: horizontal distance between the leading foot and the obstacle at toe-off prior to (DHPO) and after (DHOP) crossing, minimal vertical height from the foot to the obstacle (DVPO), average step velocity (VELOm). The segmental energies were also calculated and the work consumed by the leading limb during the crossing obstacle was computed for each trial. A statistical analysis repeated-measures ANOVA was conducted on these dependent variables revealing significant differences between the vision and non-vision conditions in healthy subjects. In addition, there were no significant differences between the blind and people with vision blindfolded. These results indicate that vision is crucial to determine the optimal trade-off between energy consumption and avoiding a trip during obstacle crossing.en
dc.description.affiliationState Univ São Paulo UNESP, Fac Sci, Bauru, Brazil
dc.description.affiliationUnespState Univ São Paulo UNESP, Fac Sci, Bauru, Brazil
dc.format.extent2133-2137
dc.identifierhttp://dx.doi.org/10.1007/978-3-540-89208-3_509
dc.identifier.citation4th European Conference of The International Federation For Medical and Biological Engineering. New York: Springer, v. 22, n. 1-3, p. 2133-2137, 2009.
dc.identifier.issn1680-0737
dc.identifier.lattes3519033218606454
dc.identifier.lattes0184563925177710
dc.identifier.orcid0000-0003-2007-5950
dc.identifier.urihttp://hdl.handle.net/11449/8384
dc.identifier.wosWOS:000299998500509
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartof4th European Conference of The International Federation For Medical and Biological Engineering
dc.relation.ispartofsjr0,143
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectVisionen
dc.subjectobstacle crossingen
dc.subjectlocomotionen
dc.subjectblinden
dc.subjectmotor controlen
dc.titleInfluence of visual information on optimal obstacle crossingen
dc.typeTrabalho apresentado em evento
dcterms.rightsHolderSpringer
unesp.author.lattes3519033218606454
unesp.author.lattes0184563925177710[4]
unesp.author.orcid0000-0002-0352-1640[2]
unesp.author.orcid0000-0002-3335-5049[1]
unesp.author.orcid0000-0003-2007-5950[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências, Baurupt
unesp.departmentComputação - FCpt

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