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TEMPORAL AND FRACTAL BEHAVIOR OF THE CENTER OF PRESSURE IN PARKINSONIAN AND HEALTHY ELDERLY COHORTS DURING QUIET STANDING
Journal of Mechanics in Medicine and Biology ( IF 0.8 ) Pub Date : 2020-12-13 , DOI: 10.1142/s0219519420400369
SEONHONG HWANG 1 , JAESUN REE 2 , JISUN HWANG 2
Affiliation  

This study investigated the quantitative scaling properties of the center of pressure (COP) as well as the spatial-temporal properties of the COP to elucidate the postural control behavior of healthy elderly (HE) adults and adults with Parkinson’s disease (PD) during quiet standing. Eighteen adults with PD and eighteen HE adults participated in this study. The COP movements were recorded while participants stood on either a firm surface or on a foam pad with their eyes either opened or closed. The sway ranges in the anterior–posterior (AP) ([Formula: see text] and medio-lateral (ML) ([Formula: see text] directions, the total length of the trajectory ([Formula: see text], sway area ([Formula: see text], and scaling exponents ([Formula: see text] from detrended fluctuation analysis were computed from the measured COP data. All temporal variables of the COP in all conditions were found to be significantly larger in the PD group than in the HE group. Low scaling exponents obtained for the PD group showed this group possessed diminished postural control ability compared to the HE group. The PD group showed unpredictable open-loop control in both the AP and ML directions. This proprioceptive control became predictable and the time scale relations decreased as the postural challenges increased. The AP and ML closed-loop control of the PD group was more predictable than that of the HE group only when proprioception was distorted using intact visual input, and the visual and proprioceptive inputs were both intact.

中文翻译:

安静站立期间帕金森病和健康老年人群压力中心的时间和分形行为

本研究调查了压力中心 (COP) 的定量尺度特性以及 COP 的时空特性,以阐明健康老年人 (HE) 和帕金森病 (PD) 成人在安静站立期间的姿势控制行为. 18 名 PD 成人和 18 名 HE 成人参加了这项研究。当参与者站在坚硬的表面或泡沫垫上,睁着或闭上眼睛时,记录 COP 的运动。前后(AP)([公式:见文本]和中外侧(ML)([公式:见文本]方向的摇摆范围,轨迹的总长度([公式:见文本],摇摆区域([公式:见文本]和缩放指数([公式:见文本]来自去趋势波动分析,是根据测量的 COP 数据计算的。发现在所有条件下 COP 的所有时间变量在 PD 组中显着大于在 HE 组中。PD 组获得的低比例指数表明,与 HE 组相比,该组的姿势控制能力有所下降。PD 组在 AP 和 ML 方向都表现出不可预测的开环控制。这种本体感觉控制变得可预测,并且随着姿势挑战的增加,时间尺度关系减少。PD 组的 AP 和 ML 闭环控制比 HE 组的闭环控制更可预测,只有当使用完整的视觉输入扭曲本体感觉时,视觉和本体感觉输入都完好无损。PD 组获得的低比例指数表明,与 HE 组相比,该组的姿势控制能力有所下降。PD 组在 AP 和 ML 方向都表现出不可预测的开环控制。这种本体感觉控制变得可预测,并且随着姿势挑战的增加,时间尺度关系减少。PD 组的 AP 和 ML 闭环控制比 HE 组的闭环控制更可预测,只有当使用完整的视觉输入扭曲本体感觉时,视觉和本体感觉输入都完好无损。PD 组获得的低比例指数表明,与 HE 组相比,该组的姿势控制能力有所下降。PD 组在 AP 和 ML 方向都表现出不可预测的开环控制。这种本体感觉控制变得可预测,并且随着姿势挑战的增加,时间尺度关系减少。PD 组的 AP 和 ML 闭环控制比 HE 组的闭环控制更可预测,只有当使用完整的视觉输入扭曲本体感觉时,视觉和本体感觉输入都完好无损。
更新日期:2020-12-13
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