Human Motor Systems Laboratory, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil.
Human Motor Systems Laboratory, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil; Biomedical Engineering, Federal University of ABC, São Bernardo do Campo, São Paulo, Brazil.
Gait Posture. 2021 May;86:240-244. doi: 10.1016/j.gaitpost.2021.03.027. Epub 2021 Mar 23.
Continuous oscillation of the support base requires anticipatory and reactive postural adjustments to maintain a stable balance. In this context, postural control flexibility or the ability to adjust balance mechanisms following the requirements of the environment is needed to counterbalance the predictable, continuous perturbation of body balance. Considering the inflexibility of postural responses in individuals with Parkinson's disease (PD), maintaining stability in the support base's continuous oscillations may be challenging. Varying the frequency of platform oscillation is an exciting approach to assess the interactions between reactive and anticipatory adjustments.
This study aimed to analyze postural responses of individuals with PD on an oscillatory support base across different frequencies.
Thirty participants with moderate PD diagnosis (M = 64.47 years, SD = 8.59; Hoehn and Yahr scale 3) and fifteen healthy age-matched controls (M = 65.8 years, SD = 4.2) were tested. Subjects maintained a dynamic balance on a platform oscillating in sinusoidal translations. Four oscillation frequencies were evaluated in different trials that ranged from 0.2 to 0.8 Hz in steps of 0.2 Hz.
Analysis showed similar performance between PD and healthy participants, with modulation of amplitudes of head displacement, center of pressure, center of mass and feet-head coordination to platform oscillation frequency.
Our findings suggest a preserved ability of individuals with PD to dynamically control body balance on a support base with predictable oscillatory translations.
支撑底座的连续振动需要进行预期和反应性的姿势调整，以保持稳定的平衡。在这种情况下，需要姿势控制灵活性或根据环境要求调整平衡机制的能力，以抵消身体平衡的可预测、连续的扰动。考虑到帕金森病（PD）患者姿势反应的不灵活性，维持支撑底座连续振动的稳定性可能具有挑战性。改变平台振动的频率是评估反应性和预期调整之间相互作用的一种令人兴奋的方法。
本研究旨在分析不同频率下 PD 患者在振动支撑底座上的姿势反应。
30 名中度 PD 诊断患者（M = 64.47 岁，SD = 8.59；Hoehn 和 Yahr 量表 3）和 15 名年龄匹配的健康对照组（M = 65.8 岁，SD = 4.2）参加了测试。受试者在正弦曲线平移的平台上保持动态平衡。在不同的试验中评估了四个振动频率，范围从 0.2 到 0.8 Hz，以 0.2 Hz 的步长递增。
分析表明，PD 患者和健康参与者的表现相似，头部位移、压力中心、质心和脚-头协调的幅度对平台振动频率进行了调制。
我们的发现表明，PD 患者在具有可预测振动平移的支撑底座上动态控制身体平衡的能力得到了保留。
