Archives of Physical Medicine and Rehabilitation
Volume 90, Issue 7 , Pages 1159-1169 , July 2009

Differences in Feedforward Trunk Muscle Activity in Subgroups of Patients With Mechanical Low Back Pain

Presented in part to the American Physical Therapy Association, February 14, 2007, Boston, MA.

  • Sheri P. Silfies, PT, PhD

      Affiliations

    • Rehabilitation Sciences Research Laboratory, Drexel University, Philadelphia, PA
    • Corresponding Author InformationReprint requests to Sheri P. Silfies, PT, PhD, Rehabilitation Sciences Research Laboratory, Drexel University, 245 N. 15th Street, MS 502, Philadelphia, PA 19102-1192
    • ,
  • Rupal Mehta, PT, MS

      Affiliations

    • Rehabilitation Sciences Research Laboratory, Drexel University, Philadelphia, PA
    • ,
  • Sue S. Smith, PT, PhD

      Affiliations

    • Rehabilitation Sciences Research Laboratory, Drexel University, Philadelphia, PA
    • ,
  • Andrew R. Karduna, PhD

      Affiliations

    • Department of Human Physiology, University of Oregon, Eugene, OR

  • Image Result

    Model of self-perturbation of the upper extremity used to evaluate response of trunk musculature.

    Model of self-perturbation of the upper extremity used to evaluate response of trunk musculature.

  • Image Result

    Mean ± SD onset of each of trunk muscle relative to the anterior deltoid onset (0ms) for (A) control, (B) MLBP instability, and (C) MLBP noninstability groups. The horizontal line represents the end (

    Mean ± SD onset of each of trunk muscle relative to the anterior deltoid onset (0ms) for (A) control, (B) MLBP instability, and (C) MLBP noninstability groups. The horizontal line represents the end (50ms) of the feedforward period (−100ms to 50ms relative to anterior deltoid onset). Striped boxes represent muscles groups acting in a feedforward manner. Note the differences between the patterns and onset latency variability between groups.

  • Image Result
    Group pattern of trunk muscle onset latency (mean) relative to deltoid onset (0ms). Plot demonstrates the latency of the MLBP groups relative to the control group (shaded region). *Significant differe

    Group pattern of trunk muscle onset latency (mean) relative to deltoid onset (0ms). Plot demonstrates the latency of the MLBP groups relative to the control group (shaded region). *Significant difference (P≤.007) between control and combined MLBP groups. §Significant difference between the instability and noninstability MLBP subgroups.

 Supported in part by grants from Orthopaedic Section of the American Physical Therapy Association and the US Department of Education, National Institute on Disability and Rehabilitation Research (H133F030024).

 No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit on the authors or on any organization with which the authors are associated.

 Device Status Statement: The devices are FDA approved for the indicated usage in the United States.

 Published online June 5, 2009 at www.archives-pmr.org.

PII: S0003-9993(09)00211-1

doi: 10.1016/j.apmr.2008.10.033

Archives of Physical Medicine and Rehabilitation
Volume 90, Issue 7 , Pages 1159-1169 , July 2009

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