Influence of visual information on optimal obstacle crossing

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorCSIC-
Autor(es): dc.creatorRodrigues, S. T. [UNESP]-
Autor(es): dc.creatorForner-Cordero, Arturo-
Autor(es): dc.creatorGarcia, V. D. [UNESP]-
Autor(es): dc.creatorZago, P. F.P. [UNESP]-
Autor(es): dc.creatorFerasoli, H. [UNESP]-
Data de aceite: dc.date.accessioned2022-08-04T22:02:00Z-
Data de disponibilização: dc.date.available2022-08-04T22:02:00Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2008-12-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1007/978-3-540-89208-3_509-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/219531-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/219531-
Descrição: dc.descriptionHuman 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. © 2009 Springer Berlin Heidelberg.-
Descrição: dc.descriptionFaculty of Science State University of São Paulo UNESP, Bauru-
Descrição: dc.descriptionNational Research Council of Spain IAI CSIC, Ctra a CampoReal km 0,2 - 28500 Arganda del Rey, Madrid-
Descrição: dc.descriptionFaculty of Science State University of São Paulo UNESP, Bauru-
Formato: dc.format2133-2137-
Idioma: dc.languageen-
Relação: dc.relationIFMBE Proceedings-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectBlind-
Palavras-chave: dc.subjectLocomotion-
Palavras-chave: dc.subjectMotor control-
Palavras-chave: dc.subjectObstacle crossing-
Palavras-chave: dc.subjectVision-
Título: dc.titleInfluence of visual information on optimal obstacle crossing-
Aparece nas coleções:Repositório Institucional - Unesp

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