I came across a study that supports the use of back braces for manuel lifting. Belts appear to result in slower lifts, proper squat-lift techiques, and reduced toro motion. Weather or not you use a belt, always follow proper lifting techiques: lift with your legs, not with your back. If you ever need to lift moderate to heavy objects at work or at home, be sure to wear a back belt. It is a small price to pay, compared to costly and painful back injuries.
Dr. Theriault