Título:	Adaptações da marcha de idosos em superfícies inclinadas durante tarefas cognitivas
Autor(es):	Aguiar, Pedro Victor Vilela de
Orientador(es):	Mezzarane, Rinaldo André
Assunto:	Cinemática Eletromiografia Marcha humana Idosos - marcha Superfícies inclinadas
Data de publicação:	15-Abr-2020
Data de defesa:	16-Ago-2019
Referência:	AGUIAR, Pedro Victor Vilela de. Adaptações da marcha de idosos em superfícies inclinadas durante tarefas cognitivas. 2019. 91 f., il. Dissertação (Mestrado em Educação Física)—Universidade de Brasília, Brasília, 2019.
Abstract:	Several studies have explored gait in different situations, covering methods that vary both the inclination where it is performed, whether on a treadmill or on natural surfaces, as well as its speed, which can be self-selected (comfortable for the subject) or predetermined by the researcher. The kinematic analysis and the electromyographic analysis applied to gait are interesting tools in the study of this movement in the most diverse conditions. In general, elderly public presents a more conservative gait pattern, in which a more stable walk is sought, especially on inclined surfaces. Another condition in which gait has been extensively explored is under dual task (cognitive and motor), aiming to understand the attentional and physiological mechanisms facing these demands. Therefore, the present study aims to verify the interference in the locomotor pattern of elderly people walking on a treadmill due to different slopes (downward, horizontal and upward) and single (non- cognitive - NOG) motor task and dual task (cognitive-motor - COG) conditions through a three- dimensional reconstruction of the feet movement, complemented by an electromyographic analysis of the soleus muscle of both participants' legs. To investigate the effects of task and inclination on gait, 13 healthy elderly (72 years ± 5 years) walked at a speed 30% above the self-selected speed over ramp up (+ 10%), down ramp (-10 %) and in the plane (0%), with application of simple motor task and dual task cognitive-motor. The biomechanical variables analyzed were spatiotemporal parameters 1 - support phase duration; 2 - swing phase duration; 3 - double support phase duration; 4 - step length; and 5 - stride length. The electrophysiological variables included the peak amplitude in the mean rectified electromyographic signal (EMG) of the soleus and the moment of the occurrence of the peak in the EMG in relation to the percentage of the complete cycle. The present study showed a greater influence of the surface inclination on the locomotor pattern, especially the downward ramp, compared to the application of the cognitive task. Differences were observed between inclinations in the variable duration of the support phase to the left side (p=0.002) and to the right side (p=0.003). Differences were found between the ramps in the duration of the double support (p=0.004) and (p=0.001) with the left foot ahead and the right foot ahead, respectively. As for the occurrence of the EMG peak, the downward slope was different from the others on both sides (p<0.001). Thus, the findings corroborate with previous studies, which revealed that walking downwards modifies the locomotion pattern, and this change is manifested through the alteration of biomechanical and electrophysiological variables. However, the behavior of variables such as step length and stride length, which did not change between different ramps, did not corroborate most of the studies cited. Having the interference of cognitive task manifested only in some situations, for specific biomechanical and electrophysiological variables, it is necessary that further studies with larger and more heterogeneous samples be performed.
Unidade Acadêmica:	Faculdade de Educação Física (FEF)
Informações adicionais:	Dissertação (mestrado)—Universidade de Brasília, Faculdade de Educação Física, Programa de Pós-Graduação em Educação Física, 2019.
Programa de pós-graduação:	Programa de Pós-Graduação em Educação Física
Licença:	A concessão da licença deste item refere-se ao termo de autorização impresso assinado pelo autor com as seguintes condições: Na qualidade de titular dos direitos de autor da publicação, autorizo a Universidade de Brasília e o IBICT a disponibilizar por meio dos sites www.bce.unb.br, www.ibict.br, http://hercules.vtls.com/cgi-bin/ndltd/chameleon?lng=pt&skin=ndltd sem ressarcimento dos direitos autorais, de acordo com a Lei nº 9610/98, o texto integral da obra disponibilizada, conforme permissões assinaladas, para fins de leitura, impressão e/ou download, a título de divulgação da produção científica brasileira, a partir desta data.
Agência financiadora:	Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) e Fundação de Apoio à Pesquisa do Distrito Federal (FAP/DF).
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