title: Estimation of Temporal Gait Events from a Single Accelerometer Through the Scale-Space Filtering Idea.
abstract: The purpose of this paper is to develop an accelerometry system capable of performing gait event demarcation and calculation of temporal parameters using a single waist-mounted device. Particularly, a mobile phone positioned over the L2 vertebra is used to acquire trunk accelerations during walking. Signals from the acceleration magnitude and the vertical acceleration are smoothed through different filters. Cut-off points between filtered signals as a result of convolving with varying levels of Gaussian filters and other robust features against temporal variation and noise are used to identify peaks that correspond to gait events. Five pre-frail older adults and five young healthy adults were recruited in an experiment. Cadence, step/stride time, step/stride CV, step asymmetry and percentages of the stance/swing and single/double support phases, among the two groups of different mobility were quantified by the system.
authors.affiliation: University of Castilla-La Mancha, Esc. Sup. de Informática, Paseo de la Universidad 4, 13071, Ciudad Real, Spain. ivan.gdiaz@uclm.es.
authors.forename: Iván
authors.identifier: http://orcid.org/0000-0001-5302-1831
authors.initials: I
authors.lastname: González
authors.affiliation: University of Castilla-La Mancha, Esc. Sup. de Informática, Paseo de la Universidad 4, 13071, Ciudad Real, Spain.
authors.forename: Jesús
authors.initials: J
authors.lastname: Fontecha
authors.affiliation: University of Castilla-La Mancha, Esc. Sup. de Informática, Paseo de la Universidad 4, 13071, Ciudad Real, Spain.
authors.forename: Ramón
authors.initials: R
authors.lastname: Hervás
authors.affiliation: University of Castilla-La Mancha, Esc. Sup. de Informática, Paseo de la Universidad 4, 13071, Ciudad Real, Spain.
authors.forename: José
authors.initials: J
authors.lastname: Bravo
mesh_terms: D061725:Accelerometry / Q000295:instrumentation*; D000465:Algorithms; D005684:Gait / Q000502:physiology*; D006801:Humans; D008161:Lumbosacral Region; D016011:Normal Distribution; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D000068997:Smartphone; D016138:Walking
keywords: Frailty; Heel-strike detection; Mobile phone; Quantitative gait analysis; Scale-space filter; Single accelerometer; Toe-off detection