title: Altered trunk motor planning in patients with nonspecific low back pain.
abstract: The authors investigated differences in trunk muscle activation timing between patients with chronic nonspecific low back pain (NSLBP) and asymptomatic controls during a self-initiated postural challenge. The authors compared 30 participants with NSLBP to 30 controls. Surface electromyographic data were collected from bilateral trunk muscles. Dependent variables were trunk muscle onset and offset relative to extremity muscle activation and duration of the trunk muscle burst and abdominal-extensor cocontraction. Patients with NSLBP demonstrated significantly delayed trunk muscle onset latency (p < .01), and shorter burst (p = .02) and cocontraction durations (p < .01). Results suggest that patients with NSLBP may be inefficient in regulating trunk posture during voluntary extremity movements. These alterations could also represent a compensatory control pattern imposed by the CNS to avoid pain.
authors.affiliation: Rehabilitations Sciences Research Laboratory, Drexel University, Philadelphia, Pennsylvania 19102-1192, USA.
authors.forename: Rupal
authors.initials: R
authors.lastname: Mehta
authors.forename: Marco
authors.initials: M
authors.lastname: Cannella
authors.forename: Susan S
authors.initials: SS
authors.lastname: Smith
authors.forename: Sheri P
authors.initials: SP
authors.lastname: Silfies
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D016022:Case-Control Studies; D004576:Electromyography; D005260:Female; D006801:Humans; D033182:Intention; D017116:Low Back Pain / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009119:Muscle Contraction / Q000502:physiology; D018482:Muscle, Skeletal / Q000502:physiology*; D004856:Postural Balance; D011597:Psychomotor Performance / Q000502:physiology*; D012016:Reference Values; D013997:Time Factors