Research on the human balance evaluation and relative factors based on random visual stimulation

In order to evaluate balancing ability in each direction more objectively and analyze the correlations between balance ability and human basic information such as gender, height and weight, the complete dynamics model of balance process under external excitation was simplified as two order linear system reasonably in this study. The evaluation system based on visual stimulation was built to provide random visual excitation source in multi-directions with equal probability for participants, avoiding subjects´ preparation of motion directions. A force platform was used to acquire information of center-of-pressure and regulation time was used as balance indicator. Feasibility of the given method was validated through the experimental study of 73 healthy undergraduate students, proving that the method can assess the impaired orientation of balance objectively, and reference range (6-10 s) of healthy persons´ regulation time were obtained as well; In addition, the experimental results reflected the relationship between balance ability and gender, height and weight in a certain extent, which had a clinical significance.