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KMID : 1144120140040030269
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Biomedical Engineering Letters
2014 Volume.4 No. 3 p.269 ~ p.276
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Analysis of progressive changes associated with muscle fatigue in dynamic contraction of biceps brachii muscle using surface EMG signals and bispectrum features
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Venugopal G.
Ramakrishnan S.
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Abstract
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Purpose: In this work, an attempt has been made to analyze surface electromyography (sEMG) signals in dynamic contractions using bispectrum features.
Methods: Signals are recorded from the biceps brachii muscle of 50 healthy volunteers during curl exercise. Bispectrum and bicoherence are estimated from the recorded sEMG signals. Sum and variance of bispectrum and bicoherence are calculated. Further analysis is carried by dividing the entire duration of the exercise into six zones. Results obtained are verified using the subject’s feedback about first muscle discomfort time.
Results: Bispectrum is observed with high amplitude peaks at zone where subjects reported first muscle discomfort. Maximum values for sum and variance of bispectrum are observed in the same zone. Similar patterns are not seen with bicoherence features. In bicoherence sum and bicoherence variance, distinctive peaks are observed in the zone when task failure occurs.
Conclusions: First discomfort zone estimated using bispectrum variance is found to be in agreement with the subject’s feedback. It appears that, this method is useful in analyzing progressive changes associated with muscle mechanics in fatigue conditions using non-invasive sEMG recordings.
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KEYWORD
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Surface EMG, Dynamic contraction, Higher order statistics, Bispectrum, Bicoherence, First muscle discomfort, Muscle fatigue
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