Journal article
Differences in Feedforward Trunk Muscle Activity in Subgroups of Patients With Mechanical Low Back Pain
Archives of physical medicine and rehabilitation, v 90(7), pp 1159-1169
01 Jul 2009
PMID: 19501348
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Differences in feedforward trunk muscle activity in subgroups C of patients with mechanical low back pain.
Objective: To investigate alterations in trunk muscle timing patterns in subgroups of patients with mechanical low back pain (MLBP). Our hypothesis was that subjects with MLBP would demonstrate delayed muscle onset and have fewer muscles functioning in a feedforward manner than the control group. We further hypothesized that we would find differences between subgroups of our patients with MLBP, grouped according to diagnosis (segmental instability and noninstability).
Design: Case-control.
Setting: Laboratory.
Participants: Forty-three patients with chronic MLBP (25 instability, 18 noninstability) and 39 asymptomatic controls.
Interventions: Not applicable.
Main Outcome Measures: Surface electromyography was used to measure onset time of 10 trunk muscles during a self-perturbation task. Trunk muscle onset latency relative to the anterior deltoid was calculated and the number of muscles functioning in feedforward determined.
Results: Activation timing patterns (P<.01; eta=.50; 1-beta=.99) and number of muscles functioning in feedforward (P=.02; eta=30; 1-beta=.83) were statistically different between patients with MLBP and controls. The control group activated the external oblique, lumbar multifidus, and erector spinae muscles in a feedforward manner. The heterogeneous MLBP group did not activate the trunk musculature in feedforward, but responded with significantly delayed activations. MLBP subgroups demonstrated significantly different timing patterns. The noninstability MLBP subgroup activated trunk extensors in a feedforward manner, similar to the control group, but significantly earlier than the instability subgroup.
Conclusions: Lack of feedforward activation of selected trunk musculature in patients with MLBP may result in a period of inefficient muscular stabilization. Activation timing was more impaired in the instability than the noninstability MLBP subgroup. Training specifically for recruitment timing may be an important component of the rehabilitation program.
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Details
- Title
- Differences in Feedforward Trunk Muscle Activity in Subgroups of Patients With Mechanical Low Back Pain
- Creators
- Sheri P. Silfies - Drexel UniversityRupal Mehta - Drexel UniversitySue S. Smith - Drexel Univ, Rehabil Sci Res Lab, Philadelphia, PA 19102 USAAndrew R. Karduna - University of Oregon
- Publication Details
- Archives of physical medicine and rehabilitation, v 90(7), pp 1159-1169
- Publisher
- Elsevier
- Number of pages
- 11
- Grant note
- K01 HD053632 / NICHD NIH HHS; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD) K01HD053632 / EUNICE KENNEDY SHRIVER NATIONAL INSTITUTE OF CHILD HEALTH &HUMAN DEVELOPMENT; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD) H133F030024 / PHS HHS; United States Department of Health & Human Services; United States Public Health Service
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- [Retired Faculty]; Physical Therapy (and Rehabilitation Sciences)
- Web of Science ID
- WOS:000267999000013
- Scopus ID
- 2-s2.0-67649401671
- Other Identifier
- 991019167582804721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Rehabilitation
- Sport Sciences