• Spine · Dec 2013

    Multicenter Study

    No relationship between body mass index and changes in pain and disability after exercise rehabilitation for patients with mild to moderate chronic low back pain.

    • Cristy Brooks, Jason C Siegler, Birinder S Cheema, and Paul W M Marshall.
    • From the School of Science and Health, University of Western Sydney, New South Wales; Australia.
    • Spine. 2013 Dec 1;38(25):2190-5.

    Study DesignA retrospective multicenter study.ObjectiveTo investigate the relationship between body mass index (BMI) and changes in pain and disability resulting from exercise-based chronic low back pain (cLBP) treatment.Summary Of Background DataPast research has shown evidence of a relationship between BMI, a measurement of obesity, and cLBP. Exercise is a known beneficial treatment for cLBP. However, it is unclear if exercise-induced changes in pain and disability are related to baseline levels of, or changes in, BMI.MethodsOne hundred and twenty-eight (n = 128) males and females with cLBP performed 8 weeks of exercise, consisting of 3 to 5 exercise sessions (minimum of 1 supervised session) per week. Outcome measures included BMI and self-reported pain and disability. BMI was calculated as weight divided by height squared (kg/m). Pain was measured using the visual analogue scale and disability was measured using the Oswestry Disability Index. Correlation, regression, covariance and likelihood ratios analyses were used to examine the relationship between BMI and self-reported pain and disability changes.ResultsNo baseline relationships between BMI and self-reported pain (r = -0.083, P = 0.349) and disability (r = 0.090, P = 0.314) were observed. There was no relationship observed between baseline BMI (P = 0.938, P = 0.873), or changes in BMI (P = 0.402, P = 0.854), with exercise-related changes in pain and disability, respectively. No relationships between baseline BMI or BMI changes with pain and disability at baseline or after exercise were observed on the basis of pain and disability subgroups. BMI was not a predictor of exercise-based pain and disability changes.ConclusionThere was no significant relationship between BMI and self-reported pain and disability in cLBP participants. BMI was not a predictor of exercise-induced changes in pain and disability. The reliance on BMI as a sole measurement of obesity in cLBP research may be unwarranted.

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