What is the best backrest angle for an ergonomic chair?

Research shows a slight recline of 100°–110° from vertical reduces intervertebral disc pressure compared to a strictly upright 90° position. The 100°–110° backrest angle is the recommended position for most ergonomic tasks. For intensive keyboard work, 95°–100° may be preferred. The backrest should always maintain contact with the lower and mid back regardless of angle. Reclining beyond 110°–120° is appropriate for rest but not for active work. At OfficeFurniture2go.com, all ergonomic chair specs include backrest angle range — call 1-800-460-0858.