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. 2021 Apr 10;21(8):2661. doi: 10.3390/s21082661

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Detection of freezing of gait (FOG) during the stepping in place (SIP) task. FOG detection during SIP from kinetics derived from vertical force measured by dual force plates (A) and from kinematics derived from shank angular velocity measured by wearable inertial measurement unit sensors (B). Blue and red traces correspond to the left and right legs, respectively. Swing angular range (C) and arrhythmicity (D) calculated from shank angular velocity show visually detectable differences between freezing and non-freezing episodes.