Changes in Motor Cortex Following Exercises for Chronic Low Back Pain

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00864422
Recruitment Status : Completed
First Posted : March 18, 2009
Last Update Posted : March 18, 2009
Information provided by:
The University of Queensland

March 17, 2009
March 18, 2009
March 18, 2009
October 2006
September 2007   (Final data collection date for primary outcome measure)
Motor cortical map and excitability from transcranial magnetic stimulation [ Time Frame: Pre and 2 weeks post-intervention ]
Same as current
No Changes Posted
  • Motor activation of the abdominal muscles during functional arm movement task [ Time Frame: Pre and 2 weeks post-intervention ]
  • Self-reported pain (VAS scale) and functional scale (patient-specific functional scale) [ Time Frame: Pre and 2 weeks post-intervention ]
Same as current
Not Provided
Not Provided
Changes in Motor Cortex Following Exercises for Chronic Low Back Pain
Driving Plasticity in the Motor Brain in Chronic Back Pain
The motor cortex of the brain changes following chronic pain and injury, and this is linked to pain-associated changes in motor behaviour. This study aimed to investigate whether therapeutic exercises in patients with chronic pain can induce reorganisation of the motor cortex and restore normal motor behaviour. The investigators hypothesised that motor training can induce reorganisation of the motor cortex and that these changes are related to improved motor behaviour.
The sensory and motor systems can reorganize following injury and learning of new motor skills. Recently we observed adaptive changes in motor cortical organization in patients with chronic back pain, which are closely linked to changes in motor behavior. Although pain-related alterations in behavior can be trained and are associated with improved symptoms, it remains unclear whether these meaningful functional outcomes are related to motor cortical reorganization. Here we investigate the effects of two interventions in people with chronic back pain: skilled motor training and a control intervention of self-paced walking exercise. We measured motor cortical excitability (motor threshold (MT)) and organization (center of gravity (CoG) and map volume) of the deep abdominal muscle, transversus abdominis (TrA), using transcranial magnetic stimulation (TMS). In addition, motor behavior of TrA was assessed during single rapid arm movements. The study helps to elucidate the mechanisms of specific motor exercises in chronic back pain management.
Phase 1
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Investigator)
Primary Purpose: Basic Science
Chronic Low Back Pain
  • Behavioral: Skilled motor training
    This involves training subjects to independently and cognitively activate the deep abdominal muscles, transversus abdominis, with minimal or no activity in other trunk muscles. The contraction is held for 10 seconds and subjects complete three blocks of ten contractions, twice per day for two weeks. This training protocol is commonly used clinically for people with chronic back pain.
  • Behavioral: Walking exercise
    The control intervention involves walking exercises for ten minutes, twice per day. Subjects are advised to walk at their own pace with no instructions on activation of specific trunk muscles. The exercise is performed over two weeks.
  • Experimental: 1
    Intervention: Behavioral: Skilled motor training
  • Active Comparator: 2
    Intervention: Behavioral: Walking exercise
Not Provided

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
Same as current
September 2007
September 2007   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • Sustained or episodic non-specific low back pain lasting longer than 3 months

Exclusion Criteria:

  • Orthopaedic, neurological, circulatory or respiratory conditions
  • History or family history of epilepsy
  • Recent or current pregnancies
  • Previous surgery to the abdomen or back
  • Abdominal or back exercises in the preceding 12 months
Sexes Eligible for Study: All
18 Years to 55 Years   (Adult)
Contact information is only displayed when the study is recruiting subjects
Not Provided
Not Provided
Dr Henry Tsao, Centre for Clinical Research Excellence in Spinal Pain, Injury and Health
The University of Queensland
Not Provided
Study Director: Paul W Hodges, MedDr (Neurosci) PhD BPhty The University of Queensland
Principal Investigator: Henry Tsao, PhD MPhty (Manipulative) BPhty The University of Queensland
The University of Queensland
March 2009

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP