Abstract: A portable therapeutic seat exercise apparatus and method that provide a lightweight personal exerciser designed for a person to use to improve physical status, and for the exercise, alignment, and stress reduction of a person's trunk, spine, abdomen, pelvis, and thighs. It encourages and enhances low back mobility in contrast to the static nature of regular sitting. It consists of a lightweight contoured seating surface supported by at least one arcuate hemispherical base that allows unrestricted motion in all directions, including twisting, tilting, and rocking. It can be placed on many seating surfaces including but not limited to sofas, dining chairs, school desk chairs, office chairs, factory benches, and motor vehicle seats. Its use facilitates low back muscular stabilization, conditioning, strengthening, coordination, and enhancement of proprioceptive senses.

Abstract: A videofluoroscopy system for use in vivo, real-time, motion analysis includes a fluoroscopy system for producing a series of x-ray images of a subject, a video recorder for recording the x-ray images as video frame images, a video playback unit for providing a playback output of individual video image frames one at a time, a frame grabber connected to a display monitor for converting each image frame into graphics data and displaying a selected viewing area thereof on the monitor, a marking device for marking selected points within the viewing area of each image frame, and a computer processor for controlling the frame grabber, display, and marking device in order to define the viewing area, detect X-Y coordinates for the selected points, and store the coordinates of the marking points as motion data. The frame grabber is implemented as a module connected to the computer processor which automatically operates the video playback unit and converts the image frames one frame at a time to digital graphics data.