与足底感知灵敏度阈值相比,踝关节扭矩方差是衡量平衡控制性能的更好指标。

IF 3.3 3区 医学 Q1 PHYSIOLOGY
Journal of applied physiology Pub Date : 2024-11-01 Epub Date: 2024-09-05 DOI:10.1152/japplphysiol.00091.2024
Frederic J F Viseux, Maxime Billot, Grant Handrigan, Martin Simoneau
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引用次数: 0

摘要

我们探讨了是踝关节扭矩变异性还是足底感知阈值能更有效地解释人类的平衡控制。我们假设,与足底感知灵敏度相比,踝关节扭矩变异性是压力中心(COP)速度变异性的更好指标。我们测试了两种情况:加载(添加 23 千克背心)和非加载,因为加载会降低足底敏感度,增加 COP 速度变化。我们创建了一个线性反馈模型,以评估负载引起的感觉运动环路中的噪声变化。在参与者赤脚站立时,采用心理物理方法对足底敏感性进行量化。一个线性电机对参与者的脚跟施加一个力脉冲。我们选择了一种 "是-否 "限制方法来确定两种条件下的足底感觉阈值。我们观察到,与无负荷条件相比,有负荷条件下的足底敏感度降低了。在负重条件下,参与者表现出更大的 COP 速度变异,显著的皮尔逊正相关性证实了踝关节扭矩和 COP 速度变异之间的实质性联系,无论是在负重条件下(变异占比 (VAR):r2 = 44.56%,p = 0.018)还是在非负重条件下(VAF:r2 = 58.83%,p = 0.004)。在有负荷(VAF:r2 = 0.002 %,p = 0.99)和无负荷(VAF:r2 = 21.81 %,p = 0.35)条件下,COP 速度方差与足底敏感阈值之间不存在明显的相关性。该模型证实,在负重条件下,传感器运动环路噪声增加了约 88%。踝关节扭矩方差评估了非知觉和知觉检测机制在评估全身运动时的精确度,以及将感觉线索转换为踝关节扭矩的精确度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ankle torque variance is a better indicator of balance control performance than plantar perceptual sensitivity threshold.

We explored whether ankle torque variability or plantar perceptual threshold explains human balance control more effectively. We hypothesized that ankle torque variance is a better indicator of center of pressure (COP) velocity variance than plantar perceptual sensitivity. Two conditions were tested: loaded (23-kg vest added) and unloaded, as loading should diminish plantar sensitivity and increase COP velocity variability. We created a linear feedback model to assess the noise change in the sensorimotor loop induced by loading. Plantar sensitivity was quantified using a psychophysical approach while participants stood barefoot. A linear motor applied a force impulse on the participant's heel. A "yes-no" method of limits was selected to identify plantar sole sensory thresholds in both conditions. We observed reduced plantar sensitivity in loaded compared with unloaded conditions. In the loaded condition, participants exhibited greater COP velocity variance, with significant positive Pearson's correlations confirming a substantial association between ankle torque and COP velocity variances for both loaded [variance accounted for (VAF): r2 = 44.56%, P = 0.018] and unloaded conditions (VAF: r2 = 58.83%, P = 0.004). No significant correlation existed between COP velocity variance and plantar sensitivity threshold for both loaded (VAF: r2 = 0.002%, P = 0.99) and unloaded conditions (VAF: r2 = 21.81%, P = 0.35). The model confirmed an ∼88% rise in sensorimotor loop noise in the loaded condition. Ankle torque variance assesses the precision of nonperceptual and perceptual detection mechanisms in evaluating whole body motions and the accuracy in converting sensory cues into ankle torque.NEW & NOTEWORTHY Plantar cutaneous information contributes to balance control by modulating motor commands, but plantar perceptual sensitivity is a suboptimal indicator of balance performance. Multiple sensory cues encode whole body dynamics, guiding sensorimotor mechanisms to minimize body sway variability. Ankle torque variance is proposed as a superior measure for explaining balance control performance and evaluating the sensorimotor loop's functioning in balance control.

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来源期刊
CiteScore
6.00
自引率
9.10%
发文量
296
审稿时长
2-4 weeks
期刊介绍: The Journal of Applied Physiology publishes the highest quality original research and reviews that examine novel adaptive and integrative physiological mechanisms in humans and animals that advance the field. The journal encourages the submission of manuscripts that examine the acute and adaptive responses of various organs, tissues, cells and/or molecular pathways to environmental, physiological and/or pathophysiological stressors. As an applied physiology journal, topics of interest are not limited to a particular organ system. The journal, therefore, considers a wide array of integrative and translational research topics examining the mechanisms involved in disease processes and mitigation strategies, as well as the promotion of health and well-being throughout the lifespan. Priority is given to manuscripts that provide mechanistic insight deemed to exert an impact on the field.
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