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Angular velocity affects trunk muscle strength and EMG activation during isokinetic axial rotation.

Abstract

OBJECTIVE

To evaluate trunk muscle strength and EMG activation during isokinetic axial rotation at different angular velocities.

METHOD

Twenty-four healthy young men performed isokinetic axial rotation in right and left directions at 30, 60, and 120 degrees per second angular velocity. Simultaneously, surface EMG was recorded on external oblique (EO), internal oblique (IO), and latissimus dorsi (LD) bilaterally.

RESULTS

In each direction, with the increase of angular velocity, peak torque decreased, whereas peak power increased. During isokinetic axial rotation, contralateral EO as well as ipsilateral IO and LD acted as primary agonists, whereas, ipsilateral EO as well as contralateral IO and LD acted as primary antagonistic muscles. For each primary agonist, the root mean square values decreased with the increase of angular velocity. Antagonist coactiviation was observed at each velocity; however, it appears to be higher with the increase of angular velocity.

CONCLUSION

Our results suggest that velocity of rotation has great impact on the axial rotation torque and EMG activity. An inverse relationship of angular velocity was suggested with the axial rotation torque as well as root mean square value of individual trunk muscle. In addition, higher velocity is associated with higher coactivation of antagonist, leading to a decrease in torque with the increase of velocity.

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  • Authors+Show Affiliations

    ,

    Department of Rehabilitation Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.

    ,

    Department of Rehabilitation Medicine, Binzhou Medical University Hospital, Binzhou 256603, China.

    Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.

    Source

    BioMed research international 2014: 2014 pg 623191

    MeSH

    Abdominal Muscles
    Adult
    Electromyography
    Humans
    Isometric Contraction
    Low Back Pain
    Male
    Muscle Strength
    Muscle, Skeletal
    Posture
    Rotation
    Spine

    Pub Type(s)

    Journal Article

    Language

    eng

    PubMed ID

    24804227

    Citation

    TY - JOUR T1 - Angular velocity affects trunk muscle strength and EMG activation during isokinetic axial rotation. AU - Fan,Jian-Zhong, AU - Liu,Xia, AU - Ni,Guo-Xin, Y1 - 2014/04/08/ PY - 2014/1/3/received PY - 2014/3/11/accepted PY - 2014/4/8/epublish PY - 2014/5/8/entrez PY - 2014/5/8/pubmed PY - 2015/1/6/medline SP - 623191 EP - 623191 JF - BioMed research international JO - Biomed Res Int VL - 2014 N2 - OBJECTIVE: To evaluate trunk muscle strength and EMG activation during isokinetic axial rotation at different angular velocities. METHOD: Twenty-four healthy young men performed isokinetic axial rotation in right and left directions at 30, 60, and 120 degrees per second angular velocity. Simultaneously, surface EMG was recorded on external oblique (EO), internal oblique (IO), and latissimus dorsi (LD) bilaterally. RESULTS: In each direction, with the increase of angular velocity, peak torque decreased, whereas peak power increased. During isokinetic axial rotation, contralateral EO as well as ipsilateral IO and LD acted as primary agonists, whereas, ipsilateral EO as well as contralateral IO and LD acted as primary antagonistic muscles. For each primary agonist, the root mean square values decreased with the increase of angular velocity. Antagonist coactiviation was observed at each velocity; however, it appears to be higher with the increase of angular velocity. CONCLUSION: Our results suggest that velocity of rotation has great impact on the axial rotation torque and EMG activity. An inverse relationship of angular velocity was suggested with the axial rotation torque as well as root mean square value of individual trunk muscle. In addition, higher velocity is associated with higher coactivation of antagonist, leading to a decrease in torque with the increase of velocity. SN - 2314-6141 UR - https://www.unboundmedicine.com/medline/citation/24804227/Angular_velocity_affects_trunk_muscle_strength_and_EMG_activation_during_isokinetic_axial_rotation_ L2 - http://dx.doi.org/10.1155/2014/623191 ER -