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Analysis of concentric and eccentric contractions in biceps brachii muscles using surface electromyography signals and multifractal analysis
Published in SAGE Publications Ltd
2016
Volume: 230
   
Issue: 9
Pages: 829 - 839
Abstract

Muscle contractions can be categorized into isometric, isotonic (concentric and eccentric) and isokinetic contractions. The eccentric contractions are very effective for promoting muscle hypertrophy and produce larger forces when compared to the concentric or isometric contractions. Surface electromyography signals are widely used for analyzing muscle activities. These signals are nonstationary, nonlinear and exhibit self-similar multifractal behavior. The research on surface electromyography signals using multifractal analysis is not well established for concentric and eccentric contractions. In this study, an attempt has been made to analyze the concentric and eccentric contractions associated with biceps brachii muscles using surface electromyography signals and multifractal detrended moving average algorithm. Surface electromyography signals were recorded from 20 healthy individuals while performing a single curl exercise. The preprocessed signals were divided into concentric and eccentric cycles and in turn divided into phases based on range of motion: lower (0°-90°) and upper (>90°). The segments of surface electromyography signal were subjected to multifractal detrended moving average algorithm, and multifractal features such as strength of multifractality, peak exponent value, maximum exponent and exponent index were extracted in addition to conventional linear features such as root mean square and median frequency. The results show that surface electromyography signals exhibit multifractal behavior in both concentric and eccentric cycles. The mean strength of multifractality increased by 15% in eccentric contraction compared to concentric contraction. The lowest and highest exponent index values are observed in the upper concentric and lower eccentric contractions, respectively. The multifractal features are observed to be helpful in differentiating surface electromyography signals along the range of motion as compared to root mean square and median frequency. It appears that these multifractal features extracted from the concentric and eccentric contractions can be useful in the assessment of surface electromyography signals in sports medicine and training and also in rehabilitation programs. © Institution of Mechanical Engineers.

About the journal
JournalData powered by TypesetProceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
PublisherData powered by TypesetSAGE Publications Ltd
ISSN09544119
Open AccessNo
Concepts (24)
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    Behavioral research
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    Electromyography
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    Fractals
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    Signal processing
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    Signal theory
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    SPORTS MEDICINE
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    BICEPS BRACHII
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    CONCENTRIC
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    DETRENDED MOVING AVERAGE
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    ECCENTRIC
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    Multi fractals
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    Muscle
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    Behavior
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    BICEPS BRACHII MUSCLE
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    Clinical article
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    CONCENTRIC MUSCLE CONTRACTION
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    Controlled study
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    ECCENTRIC MUSCLE CONTRACTION
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    Exercise
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    Human
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    Normal human
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    RANGE OF MOTION
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    Rehabilitation
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    SPORTS MEDICINE