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    Dysfunctional muscle activities and co-contraction in the lower-limb of lumbar disc herniation patients during walking

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    Author
    Wang, Wei
    Wei, Hui
    Shi, Runxiu
    Lin, Leitong
    Zhang, Lechi
    Yue, Shouwei
    Zhao, Qin
    Jia, Xiaofeng
    Li, Ke
    Zhang, Yang
    Date
    2020-11-24
    Journal
    Scientific Reports
    Publisher
    Springer Nature
    Type
    Article
    
    Metadata
    Show full item record
    See at
    https://doi.org/10.1038/s41598-020-77150-7
    Abstract
    This study aimed to investigate lower-limb muscle activities in gait phases and co-contraction of one gait cycle in patients with lumbar disc herniation (LDH). This study enrolled 17 LDH patients and 17 sex- and age-matched healthy individuals. Bilateral muscle activities of the rectus femoris (RF), biceps femoris long head (BL), tibialis anterior (TA), and lateral gastrocnemius (LG) during walking were recorded. The gait cycle was divided into four phases by the heel strike and top off according to the kinematics tracks. Root mean square (RMS), mean frequency (MF), and co-contraction of surface electromyography signals were calculated. The LDH patients showed enhanced BL RMS during the single support phase (SS), second double support phase, and swing phase (SW) as well as decreased MF of RF during SS and of TA and LG during SW (p < 0.05). The co-contraction of the TA-LG was increased in LDH patients than in the control group (p < 0.05). Positive correlations were observed between TA-LG co-contraction (affected side, r = 0.557, p = 0.020; contralateral side, r = 0.627, p = 0.007) and the Oswestry disability index scores in LDH patients. LDH patients have increased BL firing rate and insufficient motor unit recruitment in specific phases in the lower limbs during walking. Dysfunction in LDH patients was associated with immoderate intermuscular co-contraction of the TA-LG during walking.
    Sponsors
    This study was supported by Key Research and Development Plan of Shandong Province (No. 2017G006014 to Yang Zhang and No. 2019GSF108164 to Ke Li), National Natural Science Foundation of China (No. 81472159 to Yang Zhang) and Natural Science Foundation of Shandong Province (No. ZR2017MF002 to Ke Li).
    Keyword
    co-contraction
    Gait Analysis
    Intervertebral Disc Displacement
    Lower Extremity
    Walking
    Identifier to cite or link to this item
    http://hdl.handle.net/10713/14183
    ae974a485f413a2113503eed53cd6c53
    10.1038/s41598-020-77150-7
    Scopus Count
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    UMB Open Access Articles 2020

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