Abstract

MARTINS, Maria et al. Assessment of walker-assisted gait based on Principal Component Analysis and wireless inertial sensors. Rev. Bras. Eng. Bioméd. [online]. 2014, vol.30, n.3, pp.220-231. ISSN 1517-3151.  http://dx.doi.org/10.1590/rbeb.2014.020.

INTRODUCTION:This study investigates a gait research protocol to assess the impact of a walker model with forearm supports on the kinematic parameters of the lower limb during locomotion. METHODS: Thirteen healthy participants without any history of gait dysfunction were enrolled in the experimental procedure. Spatiotemporal and kinematic gait parameters were calculated by using wireless inertial sensors and analyzed with Principal Component Analysis (PCA). The PCA method was selected to achieve dimension reduction and evaluate the main effects in gait performance during walker-assisted gait. Additionally, the interaction among the variables included in each Principal Component (PCs) derived from PCA is exposed to expand the understanding of the main differences between walker-assisted and unassisted gait conditions. RESULTS:The results of the statistical analysis identified four PCs that retained 65% of the data variability. These components were associated with spatiotemporal information, knee joint, hip joint and ankle joint motion, respectively. CONCLUSION: Assisted gait by a walker model with forearm supports was characterized by slower gait, shorter steps, larger double support phase and lower body vertical acceleration when compared with normal, unassisted walking.

Keywords : Biomechanics; Principal Component Analysis; Intervention effectiveness; Walker-assisted gait.

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