Effects of subthreshold electrical stimulation with white noise, pink noise, and chaotic signals on postural control during quiet standing
Effects of subthreshold electrical stimulation with white noise, pink noise, and chaotic signals on postural control during quiet standing
复制标题
白噪声、粉红噪声和混沌信号阈下电刺激对安静站立姿势控制的影响
DOI：
10.1016/j.gaitpost.2022.02.023
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发表时间：
2022
期刊：
影响因子：
2.4
通讯作者：
Kimura Tetsuya
中科院分区：
文献类型：
--
作者：
Yamagata Momoko;Okada Shima;Tsujioka Yukiho;Takayama Arisa;Shiozawa Naruhiro;Kimura Tetsuya
背景随机共振（SR）现象已被用于改善姿势控制，通过应用不可察觉的噪声的躯体感觉系统。白色噪声信号已被应用于许多姿势控制的SR研究。然而，由于SR效应依赖于噪声结构，因此必须确定具有不同结构的信号（如粉红噪声和混沌信号）对姿势控制的刺激效果，以实现SR技术更好的临床应用。研究问题安静站立时，当具有不同结构的信号时，对膝关节的阈下电刺激如何影响姿势控制（白色噪声、粉红噪声和混沌信号）使用？方法16名健康青年人闭着眼睛安静站立40 s。为了评估姿势摇摆，我们计算了前后方向压力中心（CoP）的平均速度、均方根（CoPRMS）和范围（CoPRange）值。站立任务在阈下电刺激与白色噪声，粉红色噪声，混沌信号的基础上的洛伦兹系统，除了无刺激条件下进行。四个刺激条件下，每组内随机和重复7 times.ResultsSignificant刺激的影响，观察到在CoPRMS和CoPRangevalues。粉红噪声信号下的CoPRMS值显著低于无刺激条件下的CoPRMS值。与无刺激条件相比，粉红噪声信号下的CoPrangevalue也有降低的趋势;但差异无统计学意义。白色噪声和混沌信号与无刺激condition.SignificanceWe表明，粉红色噪声信号是更有效地减少姿势摇摆比白色噪声和混沌信号的基础上的Lorenz系统在安静的站立。
BackgroundThe stochastic resonance (SR) phenomenon has been used to improve postural control through the application of imperceptible noise to the somatosensory system. White noise signals have been applied in numerous SR studies on postural control. However, because the SR effect depends on the noise structure, the stimulation effects of signals with different structures, such as pink noise and chaotic signals, on postural control, must be determined to achieve better clinical applications of SR technology.Research questionDuring quiet standing, how is postural control affected by subthreshold electrical stimulation to the knee joints when signals with different structures (white noise, pink noise, and chaotic signals) are used?MethodsSixteen healthy young adults stood quietly for 40 s with their eyes closed. To evaluate postural sway, we calculated the mean velocity, root mean square (CoPRMS), and range (CoPRange) values for the center of pressure (CoP) in the anteroposterior direction. The standing task was conducted under subthreshold electrical stimulation with white noise, pink noise, and chaotic signals based on the Lorenz system, in addition to the no-stimulation condition. The four stimulation conditions were randomized within each set and repeated seven times.ResultsSignificant effects of stimulation were observed in the CoPRMSand CoPRangevalues. The CoPRMSvalue under the pink noise signal was significantly lower than that under the no-stimulation condition. The CoPRangevalue also tended to decrease under the pink noise signal compared with the no-stimulation condition; however, the differences were not statistically significant. No significant changes were found with the white noise and chaotic signals compared with the no-stimulation condition.SignificanceWe demonstrated that the pink noise signal was more effective in reducing postural sway than the white noise and chaotic signals based on the Lorenz system during quiet standing.