Sensitivity of trunk variability and stability measures to balance impairments induced by galvanic vestibular stimulation during gait.

K.S. van Schooten, L.H. Sloot, S.M. Bruijn, H Kingma, O.G. Meijer, M.A.G.M. Pijnappels, J.H. van Dieen

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    For targeted prevention of falls, it is necessary to identify individuals with balance impairments. To test the sensitivity of measures of variability, local stability and orbital stability of trunk kinematics to balance impairments during gait, we used galvanic vestibular stimulation (GVS) to impair balance in 12 young adults while walking on a treadmill at different speeds. Inertial sensors were used to measure trunk accelerations, from which variability in the medio-lateral direction and local and orbital stability were calculated. The short-term Lyapunov exponent and variability reflected the destabilizing effect of GVS, while the long-term Lyapunov exponent and Floquet multipliers suggested increased stability. Therefore, we concluded that only short-term Lyapunov exponents and variability can be used to asses stability of gait. In addition, to investigate the feasibility of using these measures in screening for fall risk, the presence or absence of GVS was predicted with variability and the short-term Lyapunov exponent. Predictions were good at all walking speeds, but best at preferred walking speed, with a correct classification in 83.3% of the cases. © 2011 Elsevier B.V.
    LanguageEnglish
    Pages656-660
    JournalGait and Posture
    Volume33
    Issue number4
    DOIs
    Publication statusPublished - 2011

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    Gait
    Equidae
    Biomechanical Phenomena
    Walking
    Young Adult
    Walking Speed
    Direction compound

    Cite this

    @article{86eb7d32c34042338d394de968c360bf,
    title = "Sensitivity of trunk variability and stability measures to balance impairments induced by galvanic vestibular stimulation during gait.",
    abstract = "For targeted prevention of falls, it is necessary to identify individuals with balance impairments. To test the sensitivity of measures of variability, local stability and orbital stability of trunk kinematics to balance impairments during gait, we used galvanic vestibular stimulation (GVS) to impair balance in 12 young adults while walking on a treadmill at different speeds. Inertial sensors were used to measure trunk accelerations, from which variability in the medio-lateral direction and local and orbital stability were calculated. The short-term Lyapunov exponent and variability reflected the destabilizing effect of GVS, while the long-term Lyapunov exponent and Floquet multipliers suggested increased stability. Therefore, we concluded that only short-term Lyapunov exponents and variability can be used to asses stability of gait. In addition, to investigate the feasibility of using these measures in screening for fall risk, the presence or absence of GVS was predicted with variability and the short-term Lyapunov exponent. Predictions were good at all walking speeds, but best at preferred walking speed, with a correct classification in 83.3{\%} of the cases. {\circledC} 2011 Elsevier B.V.",
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    Sensitivity of trunk variability and stability measures to balance impairments induced by galvanic vestibular stimulation during gait. / van Schooten, K.S.; Sloot, L.H.; Bruijn, S.M.; Kingma, H; Meijer, O.G.; Pijnappels, M.A.G.M.; van Dieen, J.H.

    In: Gait and Posture, Vol. 33, No. 4, 2011, p. 656-660.

    Research output: Contribution to JournalArticleAcademicpeer-review

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    AU - van Schooten, K.S.

    AU - Sloot, L.H.

    AU - Bruijn, S.M.

    AU - Kingma, H

    AU - Meijer, O.G.

    AU - Pijnappels, M.A.G.M.

    AU - van Dieen, J.H.

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    AB - For targeted prevention of falls, it is necessary to identify individuals with balance impairments. To test the sensitivity of measures of variability, local stability and orbital stability of trunk kinematics to balance impairments during gait, we used galvanic vestibular stimulation (GVS) to impair balance in 12 young adults while walking on a treadmill at different speeds. Inertial sensors were used to measure trunk accelerations, from which variability in the medio-lateral direction and local and orbital stability were calculated. The short-term Lyapunov exponent and variability reflected the destabilizing effect of GVS, while the long-term Lyapunov exponent and Floquet multipliers suggested increased stability. Therefore, we concluded that only short-term Lyapunov exponents and variability can be used to asses stability of gait. In addition, to investigate the feasibility of using these measures in screening for fall risk, the presence or absence of GVS was predicted with variability and the short-term Lyapunov exponent. Predictions were good at all walking speeds, but best at preferred walking speed, with a correct classification in 83.3% of the cases. © 2011 Elsevier B.V.

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