Ecological Momentary Assessment of Head Motion: Toward Normative Data of Head Stabilization
Ecological Momentary Assessment of Head Motion: Toward Normative Data of Head Stabilization
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DOI：
10.3389/fnhum.2019.00179
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发表时间：
2019-06-04
影响因子：
2.9
通讯作者：
Glasauer, Stefan
中科院分区：
文献类型：
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作者：
Hausamann, Peter;Daumer, Martin;Glasauer, Stefan
头部稳定是运动过程中保持平衡的基础，但在老年人或患病人群中可能会受损。以前的研究已经确定了几个参数的头部稳定性与可能的诊断价值，在实验室设置。最近，在这种受控环境中获得的措施的生态有效性已受到质疑。本研究的目的是调查生态有效性的头部稳定在现实世界中的设置参数。10名健康受试者参加了研究。用惯性测量单元（伊穆斯）记录每个受试者的头部和躯干运动至少10 h。从测量结果中提取运动周期，并估计主要频率、均方根（RMS）和回合长度。作为头部稳定的参数，衰减系数（AC），谐波比（HR），相干性，和相位差进行了计算。主导频率紧密分布在2 Hz附近，AC、HR和相干性在该频率范围内表现出最高值。所有股骨头稳定性参数均表现出与先前报告一致的特征，但观察到较高的方差。这些结果表明，头部稳定性调整到2 Hz的基本频率的运动和先前描述的头部稳定性的措施可以推广到现实世界的设置。这是第一项研究，以解决这些措施的生态有效性，突出了头部稳定性参数作为诊断工具或临床试验的结果措施的潜在用途。本研究中使用的IMU技术的低成本和易用性也有利于临床应用。
Head stabilization is fundamental for balance during locomotion but can be impaired in elderly or diseased populations. Previous studies have identified several parameters of head stability with possible diagnostic value in a laboratory setting. Recently, the ecological validity of measures obtained in such controlled contexts has been called into question. The aim of this study was to investigate the ecological validity of previously described parameters of head stabilization in a real-world setting. Ten healthy subjects participated in the study. Head and trunk movements of each subject were recorded with inertial measurement units (IMUs) for a period of at least 10 h. Periods of locomotion were extracted from the measurements and predominant frequencies, root mean squares (RMSs) and bout lengths were estimated. As parameters of head stabilization, attenuation coefficients (ACs), harmonic ratios (HRs), coherences, and phase differences were computed. Predominant frequencies were distributed tightly around 2 Hz and ACs, HRs, and coherences exhibited the highest values in this frequency range. All head stability parameters exhibited characteristics consistent with previous reports, although higher variances were observed. These results suggest that head stabilization is tuned to the 2 Hz fundamental frequency of locomotion and that previously described measures of head stability could generalize to a real-world setting. This is the first study to address the ecological validity of these measures, highlighting the potential use of head stability parameters as diagnostic tools or outcome measures for clinical trials. The low cost and ease of use of the IMU technology used in this study could additionally be of benefit for a clinical application.