A Quiet Unstable Sitting Test to quantify core stability in clinical settings: Application to adults with ventral hernia.

Background: The abdominal core is comprised of the diaphragm, abdominal wall, and pelvic floor, and serves several important functions for balance, movement, and strength. Injury to this area, such as hernia, can have substantial impact. The Quiet Unstable Sitting Test involves individuals seated on the rounded surface of a BOSU® balance trainer placed on top of a force plate and situated on a flat, elevated surface.