AUGMENTED MOVEMENT STRATEGIES FOR POSTURAL CONTROL IN PATIENTS WITH SPINOCEREBELLAR ATAXIA TYPE 3: A CASECONTROL STUDY

Arthur de Sá Ferreira, Marco Orsini, Lilian Ramiro Felício, Erika Carvalho Rodrigues, Jano Alves de Souza, Marco Antonio Araujo Leite, Acary Bulle Oliveira, Monara Nunes, Victor Hugo do Vale Bastos, Silmar Teixeira, Osvaldo J.M. Nascimento, Marcos RG de Freitas

Resumo


This study investigated the movement strategies for
postural control in patients with spinocerebellar ataxia type 3 (SCA3). Methods: This case-control study enrolled 5 patients with SCA3 (aged 41 to 51 years) and 5 healthy participants group-matched by age, body mass and body height. Participants performed 3 trials lasting 30 s each of postural tasks characterized by: feet apart or together; eyes open or closed. Center of pressure (CoP) data was quantifed using three-dimensional (3D: number of high-density and high-speed regions, average and maximal distances among regions), two-dimensional (2D: elliptical area, average velocity) and one-dimensional (1D: standard deviation, velocity) parameters. Results: Analysis of variance revealed signifcant interaction effect between group*task for 1D (F
12,238=3.496, p<0.001), 2D (F6,184=11.472, p<0.001), and 3D parameters (F12,238=2.543, p=0.004). Signifcant univariate effects for postural task were observed for all parameters, with higher body sway values under visual and biomechanical constraints,either separated or combined. Conclusions: Patients with SCA3 presented augmented
movement strategiescompared with healthy subjects, characterized by increasing body sway under more demanding biomechanical and/or visual constraints. Three-dimensional kinematic mapping revealed either random movement strategies or a unique movement strategy characterized by a stochastic CoP distribution, with high CoP speed to correct for large body sway deviations.

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Neurologia ;

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