The National Center for Complementary and Alternative Medicine (NCCAM) funded a study in 2009 at West Virginia University to evaluate the effects of Iyengar Yoga on low-back pain.
Evaluation of the effectiveness and efficacy of Iyengar yoga therapy on chronic low back pain.
Williams K, Abildso C, Steinberg L, Doyle E, Epstein B, Smith D, Hobbs G, Gross R, Kelley G, Cooper L.
Source: Department of Community Medicine, West Virginia University, Morgantown, USA. kwilliams@hsc.wvu.edu
The study concluded that there was a significant improvement in the disability, intensity of pain, and depression in the group that practiced Iyengar Yoga twice a week. The dosage of pain medication decreased.
A significant number of people, in our own experience, have seen improvements in low-back pain through most types of hatha yoga, in many cases modified for individual needs. (See Asana section of www.mahasriyoga.com for gentle modified movements that can be done sitting on a chair/bed or standing.)
Mahasri Yoga 
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