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.
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. firstname.lastname@example.org
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.)