Rebecca Mellor, Mphty, Paul W. Hodges, PhD

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Motor unit synchronization of the vasti muscles in closed and open chain tasks Rebecca Mellor, Mphty, Paul W. Hodges, PhD Archives of Physical Medicine and Rehabilitation Volume 86, Issue 4, Pages 716-721 (April 2005) DOI: 10.1016/j.apmr.2004.07.354 Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 1 Experimental setup. (A) Electrode placement, denoting fine-wire electrodes within the muscles and the monopolar needle electrode. (B) Subject position for open chain condition. (C) Subject position for closed chain condition. Abbreviations: VLd, distal vastus lateralis placement; VLp, proximal vastus lateralis placement. Archives of Physical Medicine and Rehabilitation 2005 86, 716-721DOI: (10.1016/j.apmr.2004.07.354) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 2 (A) Raw data from a representative subject obtained from recordings in the closed chain condition. Inset depicts the morphology of the reference MUAP recorded from the monopolar needle in the VMO. (B) Average of the rectified proximal vastus lateralis electromyographic data, triggered from the reference VMO motor unit, in the closed chain condition. (C) Example of PSD, obtained from an average of vastus lateralis electromyographic data, triggered from the VMO reference motor unit. The power in the spectrum at the frequency of firing of the VMO reference unit (indicated by the dotted line) is expressed as a percentage of the total power in the spectrum. Abbreviations: VLd, vastus lateralis, distal recording; VLp, vastus lateralis, proximal recording; VMOmn, vastus medialis obliquus, monopolar needle recording. Archives of Physical Medicine and Rehabilitation 2005 86, 716-721DOI: (10.1016/j.apmr.2004.07.354) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 3 Percentage of trials with power in the PSD at the firing frequency of the reference motor unit that is greater than 7.5% of total power, indicating a significantly greater number of trials (*P=.01) for the closed chain condition. Archives of Physical Medicine and Rehabilitation 2005 86, 716-721DOI: (10.1016/j.apmr.2004.07.354) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions