Upper extremity muscle activation during recovery of reaching in subjects with post- stroke hemiparesis Joanne M. Wagner, Alexander W. Dromerick, Shirley.

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Presentation transcript:

Upper extremity muscle activation during recovery of reaching in subjects with poststroke hemiparesis Joanne M. Wagner, Alexander W. Dromerick, Shirley A. Sahrmann, Catherine E. Lang Clinical Neurophysiology Volume 118, Issue 1, Pages 164-176 (January 2007) DOI: 10.1016/j.clinph.2006.09.022 Copyright © 2006 International Federation of Clinical Neurophysiology Terms and Conditions

Fig. 1 EMG traces for six UE muscles during reaching for a control subject (A and B), and a hemiparetic subject during the acute (C and D) and subacute phase (E and F) after stroke. All EMG traces start 200ms prior to start of reach and continue to target touch. x-axis=milliseconds, with negative numbers representing time prior to start of reach. y-axis=volts. Vertical line indicates the time of start of reach (0ms). (A), (C), and (E) show rectified EMG. (B), (D), and (F) show the EMG envelope (rectified, 20Hz low pass filter) used in subsequent analyses. ∗ indicates muscle onset. AD, anterior deltoid; PD, posterior deltoid; BIC, biceps; TRI, triceps; WF, wrist flexors; WE, wrist extensors. Clinical Neurophysiology 2007 118, 164-176DOI: (10.1016/j.clinph.2006.09.022) Copyright © 2006 International Federation of Clinical Neurophysiology Terms and Conditions

Fig. 2 Group mean muscle onset times during reaching for six UE muscles for the control group (A) and the hemiparetic group during the acute (B) and subacute (C) phase after stroke. Numeric values are mean (±standard deviation) muscle onset times (ms) for each muscle. Error bars represent standard deviations. x-axis=milliseconds, with negative numbers representing time prior to start of reach. y-axis line represents start of reach. Clinical Neurophysiology 2007 118, 164-176DOI: (10.1016/j.clinph.2006.09.022) Copyright © 2006 International Federation of Clinical Neurophysiology Terms and Conditions

Fig. 3 Modulation ratio during reaching for six UE muscles for the hemiparetic group during the acute (black) and subacute (gray) phase after stroke and the control group (white). Error bars represent standard deviations. Ant Del, anterior deltoid; Pos Del, posterior deltoid; Wr Fl, wrist flexors; Wr Ex, wrist extensors. Clinical Neurophysiology 2007 118, 164-176DOI: (10.1016/j.clinph.2006.09.022) Copyright © 2006 International Federation of Clinical Neurophysiology Terms and Conditions

Fig. 4 Mean %MVIC during reaching for six UE muscles for the hemiparetic group during the acute (black) and subacute (gray) phase after stroke and the control group (white). Error bars represent standard deviations. Abbreviations as in Fig. 3. Clinical Neurophysiology 2007 118, 164-176DOI: (10.1016/j.clinph.2006.09.022) Copyright © 2006 International Federation of Clinical Neurophysiology Terms and Conditions