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STUDY: Neural drive increases following resistance training in patients with MS

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  • STUDY: Neural drive increases following resistance training in patients with MS

    J Neurol. 2013 Mar 13. [Epub ahead of print]

    Neural drive increases following resistance training in patients with multiple
    sclerosis.

    Dalgas U, Stenager E, Lund C, Rasmussen C, Petersen T, Sørensen H,
    Ingemann-Hansen T, Overgaard K.

    Section of Sport Science, Department of Public Health, Aarhus University, Dalgas
    Avenue 4, 8000, Aarhus C, Denmark

    The present study tested the hypothesis that lower body progressive resistance
    training (PRT) increases the neural drive expressed as surface
    electromyographical (EMG) activity in patients with multiple sclerosis (MS). The
    study was a randomised controlled trial (RCT) including a 12-week follow up
    period.

    Thirty-eight MS patients were randomized to an exercise group (n = 19) or
    a control group (n = 19). During the intervention period, the exercise group
    performed a 12-week supervised lower body PRT program, whereas the control group
    maintained their usual daily activity level. After the 12 week intervention
    period, the exercise group were encouraged to continue training on their own for
    a 12-week follow up period, while the control group completed the 12-week
    supervised PRT program. Surface EMG was recorded from vastus lateralis, rectus
    femoris and semitendinosus during maximal isometric knee extension and knee
    flexion, before and after the intervention and at follow up. From the recordings,
    the area under the rectified, low-pass filtered EMG signal (integrated EMG, iEMG)
    was calculated. Muscle strength was expressed as the angular impulse (AI) and was
    measured during the same period as the iEMG.

    After PRT significant improvements
    for iEMG of vastus lateralis and rectus femoris during maximal knee extension and
    for semitendinosus during maximal knee flexion and for AI during both maximal
    knee extension and flexion were found in the exercise group, when compared to the
    control group. When compared to the post values, all effects, except for AI
    during knee flexion, were maintained at follow up in the exercise group. When the
    control group was exposed to PRT, a similar pattern of improvements were found,
    albeit not all improvements were significant. In conclusion twelve weeks of
    intense PRT of the lower extremities improved the neural drive expressed as
    maximal surface EMG activity in patients with MS, with effects persisting
    12 weeks after the intervention. The study was registered at clinicalTrials.gov,
    Protocol no. NCT00381576.

    PMID: 23483214
    Dave Bexfield
    ActiveMSers
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