An approach for improving repeatability and reliability of non-negative matrix factorization for muscle synergy analysis

Abstract The aim of this study was to evaluate non-negative matrix factorization (NMF) and concatenated NMF (CNMF) to analyze and reliably extract muscle synergies. NMF and CNMF were used to extract knee joint muscle synergies from surface EMGs collected during a weight bearing, force matching task....

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Bibliographic Details
Published in:Journal of electromyography and kinesiology 2016-02, Vol.26, p.36-43
Main Authors: Shourijeh, Mohammad S, Flaxman, Teresa E, Benoit, Daniel L
Format: Article
Language:English
Subjects:
Adult
Algorithms
Electromyography
Electromyography - methods
Electromyography - standards
Humans
Knee
Male
Muscle synergy
Muscle, Skeletal - physiology
Non-negative matrix factorization
Physical Medicine and Rehabilitation
Repeatability
Reproducibility of Results
Robustness
Weight-Bearing - physiology
Young Adult
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Summary:Abstract The aim of this study was to evaluate non-negative matrix factorization (NMF) and concatenated NMF (CNMF) to analyze and reliably extract muscle synergies. NMF and CNMF were used to extract knee joint muscle synergies from surface EMGs collected during a weight bearing, force matching task. Repeatability and between subject similarity were evaluated for each method using intra-class correlation coefficients (ICCs). High repeatability was found for CNMF (>0.99; 0.99–1.0) compared to NMF (>0.26; range 0.26–0.98). Reasonable consistency across subjects was improved using the CNMF over the NMF approach. CNMF was found to be a more reliable approach than NMF and suitable for between subject comparison of muscle synergies.
ISSN:1050-6411
1873-5711
DOI:10.1016/j.jelekin.2015.12.001