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Deep Learning Techniques in Estimating Ankle Joint Power Using Wearable IMUs

Authors: Arnab Barua; Umme Zakia; Carlo Menon; Xianta Jiang;

Deep Learning Techniques in Estimating Ankle Joint Power Using Wearable IMUs

Abstract

Estimating ankle joint power can be used to identify gait abnormalities, which is usually achieved by employing a complicated biomechanical model using heavy equipment settings. This paper demonstrates deep learning approaches to estimate ankle joint power from two Inertial Measurement Unit (IMU) sensors attached at foot and shank. The purpose of this study was to investigate deep learning models in estimating ankle joint power in practical scenarios, in terms of variance in walking speeds, reduced number of extracted features and inter-subject model adaption. IMU data was collected from nine healthy participants during five walking trials at different speeds on a force-plate-instrumented treadmill while an optical motion tracker was used as ground truth. Three state-of-the-art deep neural architectures, namely Long Short-Term Memory (LSTM), Convolutional Neural Network (CNN) and, fusion of CNN and LSTM (CNN-LSTM), were developed, trained, and evaluated in predicting ankle joint power by extracting few simple, meaningful features. The proposed architectures were found efficient and promising with higher estimation accuracies (correlation coefficient, R > 0.92 and adjusted R-squared value > 83%) and lower errors (mean squared error < 0.06, and mean absolute error < 0.13) in inter-participant evaluations. Performance evaluations among the three deep regressors showed that LSTM performed comparatively better. Lower standard deviations in mean squared error (0.029) and adjusted R-squared value (5.5%) proved the proposed model’s efficiency for all participants.

IEEE Access, 9

ISSN:2169-3536

Country
Switzerland
Subjects by Vocabulary

Microsoft Academic Graph classification: Mean squared error Computer science Convolutional neural network Standard deviation Gait (human) Inertial measurement unit medicine business.industry Deep learning Pattern recognition Preferred walking speed medicine.anatomical_structure Artificial intelligence Ankle business

Keywords

Ankle joint power; Inertial Measurement Units; deep neural regressor; LSTM; CNN; feature extraction, General Computer Science, deep neural regressor, Ankle joint power, General Materials Science, feature extraction, General Engineering, Inertial Measurement Units, TK1-9971, Electrical engineering. Electronics. Nuclear engineering, LSTM, CNN

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    1
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
Average
Average
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