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  • Is synergistic organisation of muscle coordination altered in people with lateral epicondylalgia? A case-control study

    Author(s)
    Heales, Luke James
    Hug, François
    MacDonald, David Alan
    Vicenzino, Bill
    Hodges, Paul William
    Griffith University Author(s)
    MacDonald, David
    Year published
    2016
    Metadata
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    Abstract
    Background: Lateral epicondylalgia is a common musculoskeletal disorder and is associated with deficits in the motor system including painful grip. This study compared coordination of forearm muscles (muscle synergies) during repeated gripping between individuals with and without lateral epicondylalgia. Methods: Twelve participants with lateral epicondylalgia and 14 controls performed 15 cyclical repetitions of sub-maximal (20% maximum grip force of asymptomatic arm), pain free dynamic gripping in four arm positions: shoulder neutral with elbow flexed to 90° and shoulder flexed to 90° with elbow extended both with forearm ...
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    Background: Lateral epicondylalgia is a common musculoskeletal disorder and is associated with deficits in the motor system including painful grip. This study compared coordination of forearm muscles (muscle synergies) during repeated gripping between individuals with and without lateral epicondylalgia. Methods: Twelve participants with lateral epicondylalgia and 14 controls performed 15 cyclical repetitions of sub-maximal (20% maximum grip force of asymptomatic arm), pain free dynamic gripping in four arm positions: shoulder neutral with elbow flexed to 90° and shoulder flexed to 90° with elbow extended both with forearm pronated and neutral. Muscle activity was recorded from extensor carpi radialis brevis/longus, extensor digitorum, flexor digitorum superficialis/profundus, and flexor carpi radialis, with intramuscular electrodes. Muscle synergies were extracted using non-negative matrix factorisation. Findings: Analysis of each position and participant, demonstrated that two muscle synergies accounted for > 97% of the variance for both groups. Between-group differences were identified after electromyography patterns of the control group were used to reconstruct the patterns of the lateral epicondylalgia group. A greater variance accounted for was identified for the controls than lateral epicondylalgia (p = 0.009). This difference might be explained by an additional burst of flexor digitorum superficialis electromyography during grip release in many lateral epicondylalgia participants. Interpretation: These data provide evidence of some differences in synergistic organisation of activation of forearm muscles between individuals with and without lateral epicondylalgia. Due to study design it is not possible to elucidate whether changes in the coordination of muscle activity during gripping are associated with the cause or effect of lateral epicondylalgia.
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    Journal Title
    Clinical Biomechanics
    Volume
    35
    DOI
    https://doi.org/10.1016/j.clinbiomech.2016.04.017
    Subject
    Biomedical engineering
    Mechanical engineering
    Sports science and exercise
    Science & Technology
    Technology
    Life Sciences & Biomedicine
    Engineering, Biomedical
    Orthopedics
    Publication URI
    http://hdl.handle.net/10072/407963
    Collection
    • Journal articles

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