Department of Industrial and Management Engineering, Hannam University, Daejeon, South Korea.
J Neuroeng Rehabil. 2011 Dec 15;8:67. doi: 10.1186/1743-0003-8-67.
Loss of postural stability can increase the likelihood of slips and falls in workplaces. The present study intended to extend understanding of the effects of frequency and pressure level of sound on postural stability during standing. Eleven male subjects participated. Standing on a force platform, the subjects' center of pressures were measured under different combinations of pressure level and frequency of the sound. Variables such as the position variability of COP and the length of postural sway path in anterior-posterior (AP) and medio-lateral (ML) direction were evaluated. Subjective ratings of perceived disturbance at each experimental condition were also obtained using a 7-point rating scale. Results showed that the length of sway path and the position variability of COP increased as the frequency of sound increased in posterior-anterior axis. The effect of sound pressure level, however, was not significant on both the postural sway length and the position variability of COP. These results suggested substantial disturbance of standing balance system among subjects exposed to high frequency noise. The results implied that physical workers should be alerted that their abilities of postural balance could be degraded significantly as disturbance caused by a sound existed.
姿势稳定性的丧失会增加工作场所滑倒和跌倒的可能性。本研究旨在进一步了解声音频率和压力水平对站立时姿势稳定性的影响。11 名男性受试者参与了这项研究。受试者站在力平台上，在不同的压力水平和声音频率组合下测量其中心压力。评估了 COP 的位置可变性和前后向（AP）和左右向（ML）方向的姿势摆动路径长度等变量。还使用 7 分制对每个实验条件下的感知干扰程度进行了主观评分。结果表明，随着声音频率的增加，COp 的摆动路径长度和位置可变性在后前轴上增加。然而，声压级对姿势摆动长度和 COP 的位置可变性都没有显著影响。这些结果表明，暴露在高频噪声下的受试者的站立平衡系统受到了很大的干扰。结果表明，体力劳动者应该意识到，由于存在声音干扰，他们的姿势平衡能力可能会显著降低。
