Harmonic ratios: a quantification of step to step symmetry.
Harmonic ratios: a quantification of step to step symmetry.
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谐波比率：对对称性对称的步骤的量化。
DOI：
10.1016/j.jbiomech.2012.12.008
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发表时间：
2013-02-22
影响因子：
2.4
通讯作者：
Redfern MS
中科院分区：
文献类型：
--
作者：
Bellanca JL;Lowry KA;Vanswearingen JM;Brach JS;Redfern MS
从躯干加速度的傅里叶分析得出的谐波比(HR)被描述为衡量行走平稳性、行走节奏性或动态稳定性的各种方法。越来越多的人对应用HR技术来研究各种病理对运动的影响感兴趣，然而，对该方法的解释一直很有限。本文的目的是对HR的数学基础进行清楚的描述，并对它们的解释有一个理解。我们介绍了谐波理论，用正弦信号解释心率，并以实际躯干加速度和肢体负荷时的谐波分析为例。我们建议，HR方法可以更好地定义，不是作为节奏性或稳定性的衡量标准，而是作为一步内步幅对称性的衡量标准。
The harmonic ratio (HR), derived from Fourier analysis of trunk accelerations, has been described in various ways as a measure of walking smoothness, walking rhythmicity, or dynamic stability. There is increasing interest in applying the HR technique to investigate the impact of various pathologies on locomotion; however, explanation of the method has been limited. The aim hereis to present a clear description of the mathematical basis of HRs and an understanding of their interpretation. We present harmonic theory, the interpretation of the HR using sinusoidal signals, and an exampleusing actual trunk accelerations and harmonic analyses during limb-loading conditions. We suggest that the HR method may be better defined, not as a measure of rhythmicity or stability, but as a measure of step-to-step symmetry within a stride.