Figure 2From: The effects of a three-week use of lumbosacral orthoses on trunk muscle activity and on the muscular response to trunk perturbations The apparatus for a quick force release experiment. The electromagnet release assembly could be moved to various points around the frame so that the quick force release testing trials could be conducted for trunk flexion (A), extension (B), right axial rotation (C), and left lateral bending (D).Back to article page