Roth N, Küderle A, Ullrich M, Gladow T, Marxreiter F, Klucken J, Eskofier B, Kluge F (2021)
Publication Language: English
Publication Type: Journal article
Publication year: 2021
Book Volume: 18
Article Number: 93
Journal Issue: 1
DOI: 10.1186/s12984-021-00883-7
Open Access Link: https://doi.org/10.1186/s12984-021-00883-7
Background: To objectively assess a patient’s gait, a robust identification of stride borders is one of the first steps in inertial sensor-based mobile gait analysis pipelines. While many different methods for stride segmentation have been presented in the literature, an out-of-lab evaluation of respective algorithms on free-living gait is still missing. Method: To address this issue, we present a comprehensive free-living evaluation dataset, including 146.574 semi-automatic labeled strides of 28 Parkinson’s Disease patients. This dataset was used to evaluate the segmentation performance of a new Hidden Markov Model (HMM) based stride segmentation approach compared to an available dynamic time warping (DTW) based method. Results: The proposed HMM achieved a mean F1-score of 92.1% and outperformed the DTW approach significantly. Further analysis revealed a dependency of segmentation performance to the number of strides within respective walking bouts. Shorter bouts (< 30 strides) resulted in worse performance, which could be related to more heterogeneous gait and an increased diversity of different stride types in short free-living walking bouts. In contrast, the HMM reached F1-scores of more than 96.2% for longer bouts (> 50 strides). Furthermore, we showed that an HMM, which was trained on at-lab data only, could be transferred to a free-living context with a negligible decrease in performance. Conclusion: The generalizability of the proposed HMM is a promising feature, as fully labeled free-living training data might not be available for many applications. To the best of our knowledge, this is the first evaluation of stride segmentation performance on a large scale free-living dataset. Our proposed HMM-based approach was able to address the increased complexity of free-living gait data, and thus will help to enable a robust assessment of stride parameters in future free-living gait analysis applications.
APA:
Roth, N., Küderle, A., Ullrich, M., Gladow, T., Marxreiter, F., Klucken, J.,... Kluge, F. (2021). Hidden Markov Model based stride segmentation on unsupervised free-living gait data in Parkinson’s disease patients. Journal of neuroEngineering and rehabilitation, 18(1). https://dx.doi.org/10.1186/s12984-021-00883-7
MLA:
Roth, Nils, et al. "Hidden Markov Model based stride segmentation on unsupervised free-living gait data in Parkinson’s disease patients." Journal of neuroEngineering and rehabilitation 18.1 (2021).
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