重心動揺計を使った動的体平衡機能検査への応用

抄録

　The Body Tracking Test (BTT) is a testing method of the dynamic body balance function wherein movement of the center of pressure (COP) in accordance with a moving visual target stimulus is examined to evaluate the tracking function of the body.
　We developed an evaluation method for BTT and a visual feedback test, which evaluates dynamic body balance functions using stabilometry.
　We also developed a method called the 10-grade evaluation of tracking ability. We investigated age changes in 516 healthy people using our 10-grade evaluation of tracking ability. The results enabled us to see the growth and age-related changes.
　The tracking axis by principal component analysis of the antero-posterior (AP) BTT was not parallel to the Y-axis and the tracking axis of the lateral BTT was not parallel to the X-axis.
　We investigated relationships with the dominant leg in human subjects to investigate the cause of changes in the inclination axis.
　The AP BTT in the right-foot dominance group showed a clockwise tilt whereas the group with left-foot dominance had a modest counter-clockwise tilt delineated by primary component analysis. This difference was found to be significant with the independent t test (p<0.0001).
　The subjects were patients who had been diagnosed as having vestibular neuronitis. Although gaze nystagmus was noted, inspection was enforced when a standing position posture was possible.
　In the antero-posterior (A-P) BTT, the direction of body sway average center displacement of X (cm) was ascertained. Deviation was seen in the affected side with stabilometry. Deviation was seen in the unaffected side with the antero-posterior (A-P) BTT.
　In the visual feedback test, the differences in size of the display circles were examined. Based on the results, a diameter of 2.5cm was considered appropriate, and clinical applications based on this consideration have started.