IntroduçãoNos últimos anos, a tecnologia otimizou o estudo da análise do movimento. Esse avanço tecnológico atingiu principalmente o estudo da marcha, gerando dados computadorizados mais precisos e fidedignos (ASTEPHEN et al., 2008; RESENDE et al., 2010). Os dados cinemáticos descrevem o movimento e incluem variáveis como deslocamento, velocidade e aceleração angular e são obtidos por equipamentos como a cinematografia e sistemas automatizados mais avançados como o Qualisys, Optotrak e Vicon (RICHARDS, 1999;CAPPOZO et al., 2005). Entretanto, o custo desses sistemas torna praticamente inviável a sua compra, obrigando pesquisadores e clínicos a fazerem uso da análise observacional.A literatura tem demonstrado que a qualidade das avaliações observacionais depende muito da habilidade do clínico (HILLMAN et al., 2010). Somado a isso, vários estudos vêm Motriz, Rio Claro, v.18 n.3, p.505-514, jul./set. 2012 Artigo Original Sistema GaitGrabber na captação de dados cinemáticos durante a marcha GaitGrabber system on kinematic gait analysesAbstract: The purpose of this study was to develop and test the validity and reliability of the GaitGrabber System in measuring kinematic variables in the sagittal plane during gait. Eighteen individuals participated in the reliability study and 28 in the concurrent validity study. The Qualisys Pro-Reflex System used as a gold standard reference system. The GaitGrabber calculates the relative angles at the hip, knee and ankle in the sagittal plane. The Intraclass Correlation Coefficient (ICC) was used to compare the average of the angular peaks between visits. The principal component analysis was used to test the validity of the system. The ICC ranged from moderate to excellent and the validity of the system was proved for the ankle. There were significant differences in the range of motion for the hip and knee joints which were attributed to different instrumental characteristics. The GaitGrabber system is valid and reliable and can be clinically used to analyze kinematics during gait in the sagittal plane.
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