一种量化个体肢体对站立姿势控制贡献的新方法。
A novel method to quantify individual limb contributions to standing postural control.
作者信息
Tracy James B, Hafer Jocelyn F, Buckley Thomas A, Allen Jessica L, Reimann Hendrik, Crenshaw Jeremy R
机构信息
Department of Kinesiology and Applied Physiology, University of Delaware, Newark, DE, USA; Department of Physical Medicine and Rehabilitation, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
Department of Kinesiology and Applied Physiology, University of Delaware, Newark, DE, USA.
出版信息
Gait Posture. 2023 May;102:106-111. doi: 10.1016/j.gaitpost.2023.03.012. Epub 2023 Mar 21.
BACKGROUND
Understanding individual limb contributions to standing postural control is valuable when evaluating populations with asymmetric function (e.g., stroke, amputations). We propose a method of quantifying three contributions to controlling the net anteroposterior center of pressure (CoP) during quiet standing: CoP moving under left and right limbs and weight shifting between the two limbs.
RESEARCH QUESTION
Can these contributions to standing postural control be quantified from CoP trajectories in neurotypical adults?
METHODS
Instantaneous contributions can be negative or larger than one, and integrated contributions sum to equal one. Proof-of-concept demonstrations validated these calculated contributions by restricting CoP motion under one or both feet. We evaluated these contributions in 30 neurotypical young adults who completed two (eyes opened; eyes closed) 30-s trials of bipedal standing. We evaluated the relationships between limb contributions, self-reported limb dominance, and between-limb weight distributions.
RESULTS
All participants self-reported as right-limb dominant; however, a range of mean limb contributions were observed with eyes opened (Left: mean [range] = 0.52 [0.37-0.63]; Right: 0.48 [0.31-0.63]) and with eyes closed (Left: 0.51 [0.39-0.63]; Right: 0.49 [0.37-0.61]). Weight-shift contributions were small with eyes opened (0.00 [-0.01 to 0.01]) and eyes closed (0.00 [-0.01 to 0.02]). We did not identify any between-limb differences in contributions when grouped by self-reported limb dominance (p > 0.10, d < 0.31). Contributions did not significantly correlate with Waterloo Footedness scores (-0.22 < r < 0.21, p > 0.25) or between-limb weight distributions (0 < r < 0.24, p > 0.20).
SIGNIFICANCE
Across neurotypical participants, we observed a notable range of limb contributions not related to self-reported limb dominance or between-limb weight distributions. With this tool, we can characterize differences in the amount of CoP motion and the underlying control strategies. Changes in limb contribution can be measured longitudinally (i.e., across rehabilitation programs, disease progression, aging) representative of limb function, which may be particularly useful in populations with asymmetric function.
背景
在评估功能不对称人群（如中风、截肢患者）时，了解个体肢体对站立姿势控制的贡献具有重要价值。我们提出了一种量化安静站立时对控制前后重心（CoP）的三种贡献的方法：CoP在左右下肢下的移动以及两下肢之间的体重转移。
研究问题
能否从神经典型成年人的CoP轨迹中量化这些对站立姿势控制的贡献？
方法
瞬时贡献可能为负或大于1，积分贡献总和等于1。概念验证演示通过限制一只脚或两只脚下的CoP运动来验证这些计算出的贡献。我们评估了30名神经典型年轻成年人的这些贡献，他们完成了两次（睁眼；闭眼）30秒的双足站立试验。我们评估了肢体贡献、自我报告的肢体优势以及两下肢之间体重分布之间的关系。
结果
所有参与者自我报告为右下肢优势；然而，睁眼时观察到一系列平均肢体贡献（左：均值[范围]=0.52[0.37 - 0.63]；右：0.48[0.31 - 0.63]），闭眼时（左：0.51[0.39 - 0.63]；右：0.49[0.37 - 0.61]）。睁眼时（0.00[-0.01至0.01]）和闭眼时（0.00[-0.01至0.02]）体重转移贡献较小。按自我报告的肢体优势分组时，我们未发现肢体贡献存在任何差异（p>0.10，d<0.31）。贡献与滑铁卢足性评分（-0.22<r<0.21，p>0.25）或两下肢之间体重分布（0<r<0.24，p>0.20）均无显著相关性。
意义
在神经典型参与者中，我们观察到一系列与自我报告的肢体优势或两下肢之间体重分布无关的显著肢体贡献范围。借助此工具，我们可以描述CoP运动量和潜在控制策略的差异。肢体贡献的变化可以纵向测量（即跨康复计划、疾病进展、衰老过程），以代表肢体功能，这在功能不对称人群中可能特别有用。
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