Abstract
BackgroundIdentification of individual gait events is essential for clinical gait analysis, because it can be used for diagnostic purposes or tracking disease progression in neurological diseases such as Parkinsonâs disease. Previous research has shown that gait events can be detected from a shank-mounted inertial measurement unit (IMU), however detection performance was often evaluated only from straight-line walking. For use in daily life, the detection performance needs to be evaluated in curved walking and turning as well as in single-task and dual-task conditions.MethodsParticipants (older adults, people with Parkinsonâs disease, or people who had suffered from a stroke) performed three different walking trials: (1) straight-line walking, (2) slalom walking, (3) Stroop-and-walk trial. An optical motion capture system was used a reference system. Markers were attached to the heel and toe regions of the shoe, and participants wore IMUs on the lateral sides of both shanks. The angular velocity of the shank IMUs was used to detect instances of initial foot contact (IC) and final foot contact (FC), which were compared to reference values obtained from the marker trajectories.ResultsThe detection method showed high recall, precision and F1 scores in different populations for both initial contacts and final contacts during straight-line walking (IC: recall = 100%, precision = 100%, F1 score = 100%; FC: recall = 100%, precision = 100%, F1 score = 100%), slalom walking (IC: recall = 100%, precision ge 99%, F1 score =100%; FC: recall = 100%, precision ge 99%, F1 score =100%), and turning (IC: recall ge 85%, precision ge 95%, F1 score ge91%; FC: recall ge 84%, precision ge 95%, F1 score ge89%).ConclusionsShank-mounted IMUs can be used to detect gait events during straight-line walking, slalom walking and turning. However, more false events were observed during turning and more events were missed during turning. For use in daily life we recommend identifying turning before extracting temporal gait parameters from identified gait events.
Highlights
Identification of individual gait events is essential for clinical gait analysis, because it can be used for diagnostic purposes or tracking disease progression in neurological diseases such as Parkinsonâs disease
The aim of this study is to quantify the performance of initial foot contact (IC) and foot contact (FC) detection in straight-line walking under single-task and dual-task conditions, and to quantify detection performance in curved walking and turning in older adults (OA), people diagnosed with Parkinsonâs disease (PD), and people who have suffered from a stroke (ST)
One IC and one FC were falsely detected for a single PD patient in the slalom walking trial, where the patient swung its foot forward and backward without taking a step
Summary
Identification of individual gait events is essential for clinical gait analysis, because it can be used for diagnostic purposes or tracking disease progression in neurological diseases such as Parkinsonâs disease. Previous research has shown that gait events can be detected from a shank-mounted inertial measurement unit (IMU), detection performance was often evaluated only from straight-line walking. Gait is recognized as a surrogate marker of health, and provides essential clinical insights in neurological disease status [1, 2]. Gait has been assessed by visual observation, which suffers from subjectivity and imprecision [3]. To overcome these limitations, multi-camera optical motion capture (OMC) systems can be used, but these systems are relatively expensive and restricted to Romijnders et al J NeuroEngineering Rehabil (2021) 18:28 expertise laboratories [4]. Inertial measurement units (IMUs) provide a promising alternative to assess gait in an objective, unobtrusive and unconstrained manner [4, 7]
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