European Spine Journal

, Volume 21, Issue 7, pp 1301–1310

Spine stabilisation exercises in the treatment of chronic low back pain: a good clinical outcome is not associated with improved abdominal muscle function

  • A. F. Mannion
  • F. Caporaso
  • N. Pulkovski
  • H. Sprott
Original Article

Abstract

Introduction

Various studies have shown that spine stabilisation exercise therapy elicits improvements in symptoms/disability in patients with chronic non-specific low back pain (cLBP). However, few have corroborated the intended mechanism of action by examining whether clinical improvements (1) are greater in patients with functional deficits of the targeted muscles and (2) correlate with post-treatment improvements in abdominal muscle function.

Methods

Pre and directly after 9 weeks’ therapy, 32 cLBP patients (44.0 ± 12.3 years) rated their LBP intensity (0–10) and disability (0–24, Roland–Morris; RM) and completed psychological questionnaires. At the same timepoints, the voluntary activation of transversus abdominis (TrA), obliquus internus and obliquus externus during “abdominal-hollowing” and the anticipatory (“feedforward”) activation of these muscles during rapid arm movements were measured using M-mode ultrasound with tissue Doppler imaging.

Results

Pre-therapy to post-therapy, RM decreased from 8.9 ± 4.7 to 6.7 ± 4.3, and average pain, from 4.7 ± 1.7 to 3.5 ± 2.3 (each P < 0.01). The ability to voluntarily activate TrA increased by 4.5% (P = 0.045) whilst the anticipatory activation of the lateral abdominal muscles showed no significant change (P > 0.05). There was no significant correlation between the change in RM scores after therapy and either baseline values for voluntary (r = 0.24, P = 0.20) or anticipatory activation (r = 0.04, P = 0.84), or their changes after therapy (voluntary, r = 0.08, P = 0.66; anticipatory, r = 0.16, P = 0.40). In multiple regression, only a reduction in catastrophising (P = 0.0003) and in fingertip–floor distance (P = 0.0006) made unique contributions to explaining the variance in the reduction in RM scores.

Conclusion

Neither baseline lateral abdominal muscle function nor its improvement after a programme of stabilisation exercises was a statistical predictor of a good clinical outcome. It is hence difficult to attribute the therapeutic result to any specific effects of the exercises on these trunk muscles. The association between changes in catastrophising and outcome serves to encourage further investigation on larger groups of patients to clarify whether stabilisation exercises have some sort of “central” effect, unrelated to abdominal muscle function per se.

Keywords

Spine stabilisation exercise therapy Outcome Chronic low back pain 

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • A. F. Mannion
    • 1
  • F. Caporaso
    • 2
  • N. Pulkovski
    • 2
  • H. Sprott
    • 2
  1. 1.Spine Center Division, Department of Research and DevelopmentSchulthess KlinikZurichSwitzerland
  2. 2.Department of Rheumatology and Institute of Physical MedicineUniversity Hospital ZürichZurichSwitzerland

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