Idiosyncratic Characteristics of Postural Sway in Normal and Perturbed Standing.
Idiosyncratic Characteristics of Postural Sway in Normal and Perturbed Standing.
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DOI：
10.3389/fnhum.2021.660470
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发表时间：
2021
影响因子：
2.9
通讯作者：
Reynolds RF
中科院分区：
文献类型：
--
作者：
Sakanaka TE;Lakie M;Reynolds RF
有很大生理摇摆特征的人站在移动的表面上时会变得特别不稳定吗？站立个人的姿势摆动是不是独一无二的？在这项研究中，我们检查了正常站立的个人的姿势摆动，以及当细微的连续正弦干扰应用于他们的支撑平台时。我们计算条件之间的一致性，以验证摇摆是否可以被认为是每个人的特征。我们还将参与者对干扰的反应的两个不同方面联系起来：他们的摇摆速度和他们对身体方向的调节。19名健康成人(年龄29.2±3.2岁)自由地站在脚板上，脚板与脚踝同轴对齐，并附着在机动平台上。他们闭上眼睛，臀部和膝盖被一块连接在身体上的轻质木板锁住。参与者要么静静地站在固定平台上，要么静静地站在缓慢倾斜的平台上(0.1赫兹正弦；0.2和0.4度)。姿势摇摆的大小被分为两个实体：(1)自发摇摆速度分量(自然随机相对快速的姿势调整，RMS体角速度)和(2)诱发倾斜增益分量(由平台移动引起的0.1 Hz同步倾斜，测量为峰-峰(p-p)增益，身体角度与施加的踏板旋转的比率)。个体摇摆速度与诱发倾斜增益之间无相关性(r=0.34，p=0.15和r=0.30，p=0.22)。然而，当分开考虑时，两种测量结果在条件下都显示出相当到很好的绝对一致性。当参与者受到越来越多的干扰时，自发摇摆速度持续增加。在所有条件下，影响较大(或较小)的参与者[ICC(3，k)=0.95]。诱发倾斜增益在不同条件之间也表现出一致性[ICC(3，k)=0.79]，但从最小干扰条件到最大干扰条件递减。在不同的条件下，这两种测量结果保持一致。两个截然不同、互不相关的测量条件之间的一致性反映了姿势摆动的特殊性质。然而，摇摆速度和倾斜增益并不相关，这支持了稳定性的短期调节和定向的长期调节受不同过程控制的观点。
Are people with a characteristically large physiological sway rendered particularly unstable when standing on a moving surface? Is postural sway in standing individuals idiosyncratic? In this study, we examine postural sway in individuals standing normally, and when subtle continuous sinusoidal disturbances are applied to their support platform. We calculate consistency between conditions to verify if sway can be considered characteristic of each individual. We also correlate two different aspects of participants’ responses to disturbance; their sway velocity and their regulation of body orientation. Nineteen healthy adults (age 29.2 ± 3.2 years) stood freely on footplates coaxially aligned with their ankles and attached to a motorized platform. They had their eyes closed, and hips and knees locked with a light wooden board attached to their body. Participants either stood quietly on a fixed platform or on a slowly tilting platform (0.1 Hz sinusoid; 0.2 and 0.4 deg). Postural sway size was separated into two entities: (1) the spontaneous sway velocity component (natural random relatively rapid postural adjustments, RMS body angular velocity) and (2) the evoked tilt gain component (much slower 0.1 Hz synchronous tilt induced by the movement of the platform, measured as peak-to-peak (p-p) gain, ratio of body angle to applied footplate rotation). There was no correlation between the velocity of an individual’s sway and their evoked tilt gain (r = 0.34, p = 0.15 and r = 0.30, p = 0.22). However, when considered separately, each of the two measurements showed fair to good absolute agreement within conditions. Spontaneous sway velocity consistently increased as participants were subjected to increasing disturbance. Participants who swayed more (or less) did so across all conditions [ICC(3,k) = 0.95]. Evoked tilt gain also showed consistency between conditions [ICC(3,k) = 0.79], but decreased from least to most disturbed conditions. The two measurements remain consistent between conditions. Consistency between conditions of two very distinct unrelated measurements reflects the idiosyncratic nature of postural sway. However, sway velocity and tilt gain are not related, which supports the idea that the short-term regulation of stability and the longer-term regulation of orientation are controlled by different processes.
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影响因子：
5.5
作者：
Loram, ID;Maganaris, CN;Lakie, M
通讯作者：
Lakie, M
影响因子：
5.5
作者：
FITZPATRICK, R;ROGERS, DK;MCCLOSKEY, DI
通讯作者：
MCCLOSKEY, DI
影响因子：
3.4
作者：
Duarte, Marcos;Freitas, Sandra M. S. F.
通讯作者：
Freitas, Sandra M. S. F.
影响因子：
5.5
作者：
Lakie, M;Caplan, N;Loram, ID
通讯作者：
Loram, ID
影响因子：
5.5
作者：
DAY, BL;STEIGER, MJ;MARSDEN, CD
通讯作者：
MARSDEN, CD