Before revision: A 1989 study on a sample of 20 subjects concluded that the Balans chair promoted greater lumbar curvature than the "straight back chair" during relaxed sitting, typing, and writing, and that it could contribute to treatment of lower back injuries.
After revision: A 1989 study on a sample of 20 subjects concluded that the Balans chair promoted greater lumbar curvature than the "straight back chair" during relaxed sitting, typing, and writing, and that it be helpful in treatment of lower back injuries.