Trunk Muscle Activation Patterns and Spine Kinematics When Using an Oscillating Blade: Influence of Different Postures and Blade Orientations Daniel.

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Trunk Muscle Activation Patterns and Spine Kinematics When Using an Oscillating Blade: Influence of Different Postures and Blade Orientations Daniel Sánchez-Zuriaga, MD, PhD, Francisco J. Vera-Garcia, PhD, Janice M. Moreside, PT, MHK, Stuart M. McGill, PhD Archives of Physical Medicine and Rehabilitation Volume 90, Issue 6, Pages 1055-1060 (June 2009) DOI: 10.1016/j.apmr.2008.12.015 Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 1 Images of 1 subject using the Bodyblade: (A) erect standing with device in vertical orientation; (B) erect standing with device in horizontal orientation; (C) erect sitting with device in vertical orientation; (D) erect sitting with device in horizontal orientation. Note that the vertical orientation produces medial-lateral oscillations of blade in the frontal plane, whereas the horizontal orientation generates up-down oscillations in the sagittal plane. Archives of Physical Medicine and Rehabilitation 2009 90, 1055-1060DOI: (10.1016/j.apmr.2008.12.015) Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 2 Averages and SDs of the mean normalized EMG amplitudes (%MVC) when using the Bodyblade in an erect standing or an erect sitting position, and with horizontal or vertical orientation of blade. Abbreviations: AD, anterior deltoid (dashed light gray block); PM, pectoralis major (dashed dark gray block). Archives of Physical Medicine and Rehabilitation 2009 90, 1055-1060DOI: (10.1016/j.apmr.2008.12.015) Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 3 Vertical stand. Normalized EMG time histories of 1 typical subject for right IO (black line) and right EO (gray line) during use of the Bodyblade in standing with a vertical orientation of blade. Notice the antiphasic coactivity between the IO and EO signals. Archives of Physical Medicine and Rehabilitation 2009 90, 1055-1060DOI: (10.1016/j.apmr.2008.12.015) Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 4 Horizontal stand. Normalized EMG time histories of 1 typical subject for right ES at T9 (black line) and right RA (gray line) during use of the Bodyblade in standing with a vertical orientation of blade. This is an example of the antiphasic manner in which subjects recruited the T9 ES and RA. Archives of Physical Medicine and Rehabilitation 2009 90, 1055-1060DOI: (10.1016/j.apmr.2008.12.015) Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions