Abstract

Space and time gait parameters can be estimated with wearable inertial units. Linear displacement information is typically obtained by double integrating accelerometer data over each gait cycle. However, usually a drift affects the resulting displacement signals and therefore its effects should be minimized. In the majority of studies using accelerometers, drift is corrected on the hypothesis that during the stance phase, the velocity of the sensor placed on the foot is zero. This assumption allows to set to zero the estimated velocity at both the beginning and the end of the gait cycle. Despite the use of the latter hypothesis is crucial for the drift correction, to the authors’ knowledge, no quantitative validation of this hypothesis is available in the literature. This study aimed at determining the velocity profiles of various points of the foot during the stance phase of the gait cycle while walking at different speeds.

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