A comparison of stability metrics based on inverted pendulum models for assessment of ramp walking.
A comparison of stability metrics based on inverted pendulum models for assessment of ramp walking.
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DOI：
10.1371/journal.pone.0206875
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发表时间：
2018
期刊：
影响因子：
3.7
通讯作者：
Silverman AK
中科院分区：
文献类型：
--
作者：
Pickle NT;Wilken JM;Fey NP;Silverman AK
在坡道上保持平衡对机动性很重要。然而，平衡通常使用基于倒置矩阵的度量（例如，稳定性裕度），这可能不适合于评估人类在非水平表面上行走。为了研究这一点，我们分析了稳定性斜坡上使用四种不同的倒立摆模型：外推质心（XCOM），脚放置估计（FPE），脚放置估计忽略角动量（FPENoH），和捕获点（CAP）。我们分析了10名身体健全的人在0°、±5°和±10°坡道上行走的实验数据。与我们假设的在±10°处度量之间的差异幅度最大相反，我们观察到在0°处度量之间的差异幅度最大。一般而言，稳定性指标在每个斜坡上由FPE和CAP限定，与先前的水平行走研究一致。我们的研究结果还表明，临床提供者和研究人员应该意识到，忽略角动量的评估（例如，稳定性裕度，XCOM）与结合角动量的分析相比可能低估了矢状面中的稳定性（例如，FPE）。除了FPENoH-CAP（r = 0.82），指标之间的差异仅中度相关（|R| ≤0.65），违反了基础倒立摆模型中的腿长假设。FPENoH相对于FPE和CAP的差异与身体质心垂直速度（最大值）密切相关|R| = 0.92），表明质心运动的模型表示影响稳定性度量。然而，模型输入与稳定性指标差异之间没有明确的总体关系。未来的敏感性分析可能会对影响稳定性指标的模型特征提供更多的见解。
Maintaining balance on ramps is important for mobility. However, balance is commonly assessed using inverted pendulum-based metrics (e.g., margin of stability), which may not be appropriate for assessment of human walking on non-level surfaces. To investigate this, we analyzed stability on ramps using four different inverted pendulum models: extrapolated center of mass (XCOM), foot placement estimate (FPE), foot placement estimate neglecting angular momentum (FPENoH), and capture point (CAP). We analyzed experimental data from 10 able-bodied individuals walking on a ramp at 0°, ±5°, and ±10°. Contrary to our hypothesis that the magnitude of differences between metrics would be greatest at ±10°, we observed the greatest magnitude of differences between metrics at 0°. In general, the stability metrics were bounded by FPE and CAP at each slope, consistent with prior studies of level walking. Our results also suggest that clinical providers and researchers should be aware that assessments that neglect angular momentum (e.g., margin of stability, XCOM) may underestimate stability in the sagittal-plane in comparison to analyses which incorporate angular momentum (e.g., FPE). Except for FPENoH-CAP (r = 0.82), differences between metrics were only moderately correlated (|r|≤0.65) with violations of leg length assumptions in the underlying inverted pendulum models. The differences in FPENoH relative to FPE and CAP were strongly correlated with body center of mass vertical velocity (max |r| = 0.92), suggesting that model representations of center of mass motion influence stability metrics. However, there was not a clear overall relationship between model inputs and differences in stability metrics. Future sensitivity analyses may provide additional insight into model characteristics that influence stability metrics.
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影响因子：
3.7
作者：
Rábago CA;Aldridge Whitehead J;Wilken JM
通讯作者：
Wilken JM
影响因子：
2
作者：
Ruina, A;Bertram, JEA;Srinivasan, M
通讯作者：
Srinivasan, M
DOI：
10.1115/1.1427703
发表时间：
2002-02-01
影响因子：
1.7
作者：
Kuo, AD
通讯作者：
Kuo, AD
DOI：
10.1016/j.apmr.2013.07.020
发表时间：
2013-11-01
影响因子：
4.3
作者：
Hak, Laura;van Dieen, Jaap H.;Houdijk, Han
通讯作者：
Houdijk, Han
影响因子：
2.4
作者：
Pickle, Nathaniel T.;Wilken, Jason M.;Silverman, Anne K.
通讯作者：
Silverman, Anne K.