A need currently exists to develop a kinematic data gathering system small enough to allow free movement of subjects in both ground-based, zero-G simulation studies and space-based shuttle missions. The system studied in this project measures kinematic motion through the use of orthogonally mounted, linear accelerometers.Initial results of the Phase I study of a five- segment model show that the use of five, three-dimensional accelerometer units gives inaccurate results. At least eight such units are needed for mounting points on the shoulder joints, the wrists, the hip joints, and the ankles. A nine-segment model requires at least eleven accelerometers. Here mounting would occur at the wrists, elbows, shoulder joints, waist, knees, and ankles. Since each joint would be equipped with units containing three orthogonally mounted accelerometers, motion of each limb segment would be measured by six accelerometers. Phase I studies confirmed the technical feasibility of fabricating small, unobtrusive measurement units which overcome the inhibiting effects of current kinematic measurement systems. Size constraints are within bounds, required accelerometer response is achievable, and software will allow real-time mapping of positional data.Potential Commercial Application:The system described would have commercial applications in judging athletes' performance by graphical representation, in rehabilitation medicine, in the science of kinesiology for monitoring prosthetic motion in real-time, and in the science of epidemiology for monitoring habitual physical activity.STATUS: Phase I Only
