通过加速度计来评估频域中的负载率
Jin Luo1, Noushin Ahmadvand1, Mike Crooks2
1School of Medicine and Biosciences, University of West London, UK.
概括
这项研究引入了一种新的频域方法,使用加速度计来评估步行时的负载率. 这些发现揭示了车身位置的负载率如何变化,并与时间域测量相关.
科学领域:
- 生物力学 生物力学
- 人类的机动运动
- 信号处理 信号处理
背景情况:
- 负载率对于了解行走过程中肌肉骨健康至关重要.
- 当前的方法往往侧重于时间域分析,可能缺少频率特定的信息.
- 加速度计提供了一种便携式和可访问的手段来测量生物力学负荷.
研究的目的:
- 开发和验证一种频域方法,用于从加速度计数据计算负载率.
- 为了研究在行走过程中,频域负载率如何在不同的身体部分 (骨盆,大腿,腿,脚) 之间变化.
- 为了比较频域加载率与传统时间域测量 (平均加载率 - ALR,即时加载率 - ILR).
主要方法:
- 设计了一种新的方法,将加速度信号分解成频段 (0-3,3-6,6-10,10-15 Hz),以隔离负载组件.
- 分析了人类行走的开放访问数据,包括加速度计和地面反应力.
- 在频域中计算了四个不同的频段的负载率,并与时间域的ALR和ILR进行了比较.
主要成果:
- 在所有分析频段中,频域负载率从脚到骨盆显著减弱 (p < 0.001).
- 在低频 (<10 Hz) 和高频 (>10 Hz) 频段之间,衰减模式有所不同.
- 频域加载率与ALR和ILR显著相关 (R2 = 0.440.56),较低频率观察到更强的相关性.
结论:
- 加速度计的频域分析为人类移动过程中的生物力学负荷提供了宝贵的见解.
- 这种方法可以在各种车身段和频率范围内区分负载特征.
- 在频域中评估负载率为时间域分析提供了补充信息,以全面了解生物力学负载.
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