Ambulatory estimation of foot movement during gait using inertial sensors

H. Martin Schepers, Petrus H. Veltink

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    Human body movement analysis is commonly done in so-called 'gait laboratories’. In these laboratories, body movement is masured using optically based systems like Vicon, Optrotrak. The major drawback of these systems is the restriction to a laboratory environment. Therefore research is required to find ways for performing these measurements outside the gait laboratory. The estimation of foot movement is important, since balance is controlled by foot placement during gait. This study investigates whether it is possible to estimate foot movement, specifically foot placement, during gait under ambulatory conditions. The measurement system consisted of an orthopaedic sandal with two six degrees-of-freedom force/moment sensors beneath the heel and the forefoot. It should be noted that the force sensors were merely used for gait phase detection. The position and orientation of heel and forefoot were estimated using the accelerometers and gyroscopes of two miniature inertial sensors, rigidly attached to the force sensors [1,3]. In addition, errors in the walking direction were compensated for by using knowledge about the average walking direction. The proposed ambulatory measurement system was similar to the one used in a previous study [3]. In that study the position and orientation determination was restarted each step, while this study allows estimation of position and orientation during several steps including a change of direction. However, the accuracy should be investigated in more detail by an evaluation study. Moreover, the measurement system can be simplified by using a different gait phase detection system, for example by a gyroscope based detection system [2]. The financial support from the Dutch Ministry of Economic Affairs for the FreeMotion project is gratefully acknowledged. REFERENCES [1] H.J. Luinge and P.H. Veltink, “Measuring orientation of human body segments using miniature gyroscopes and accelerometers��?, Med. Bio. Eng. Comp., Vol. 43, pp. 273-282, (2005). [2] I.P.I. Pappas, M.R. Popovic, M.R. Keller, V. Dietz and M. Morari, “A reliable gait phase detection system��?, IEEE Trans. Neural Syst. Rehabil. Eng., Vol. 9, pp. 113-125, (2001). [3] H.M. Schepers, P.H. Veltink and H.F.J.M. Koopman, “Ambulatory assessment of ankle and foot dynamics��?, IEEE Trans. Biomed. Eng., Submitted, (2006).
    Original languageUndefined
    Title of host publicationFirst Dutch Conference on Bio-Medical Engineering
    Place of PublicationDelft
    PublisherDelft University of Technology
    Number of pages1
    ISBN (Print)not assigned
    Publication statusPublished - Jan 2007
    Event1st Dutch Bio-Medical Engineering Conference, BME 2007 - Hotel Zuiderduin, Egmond aan Zee, Netherlands
    Duration: 18 Jan 200719 Jan 2007
    Conference number: 1

    Publication series

    PublisherTU Delft


    Conference1st Dutch Bio-Medical Engineering Conference, BME 2007
    Abbreviated titleBME
    CityEgmond aan Zee


    • BSS-Biomechatronics and rehabilitation technology
    • IR-64500
    • METIS-245821
    • EWI-11495

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