心血管系统中的非静止生理噪声在交感-阴道变化期间
Andrea Scarciglia1, Vincenzo Catrambone1, Claudio Bonanno2
1Neurocardiovascular Intelligence Lab, Bioengineering and Robotics Research Center E. Piaggio & Department of Information Engineering, School of Engineering, University of Pisa, Pisa, Italy.
Chaos (Woodbury, N.Y.)
|May 8, 2025
概括
这项研究提出了一种新方法,用于估计心率变化 (HRV) 信号中的生理噪声. 该方法揭示了噪音水平如何随着姿势的变化而变化,为自主调节和心血管健康提供了洞察力.
科学领域:
- 生物医学工程 生物医学工程
- 生理信号处理 生理信号处理
- 信息理论 信息理论
背景情况:
- 生物医学信号中的生理噪声,如心率变化 (HRV),通常是非静止的和复杂的.
- 准确估计这种噪音对于可靠分析心血管变异性和自主功能至关重要.
- 现有的方法可能会与生理噪音的动态和非线性性质作斗争.
研究的目的:
- 开发和验证一种用于估计生物医学信号中的非静止生理噪声的新方法.
- 研究在姿势变化期间生理噪声动态和自主调节之间的关系.
- 评估生理噪声对 HRV 分析中复杂度指标的解释的影响.
主要方法:
- 开发了一种新的估计方法,使用一个信息理论定量器,即近似.
- 物理噪声被建模为独立和相同分布的高斯随机变量 (IID) 的动态递归实现.
- 该方法采用了滑窗过程来估计在姿势变化 (站立,缓慢倾斜,快速倾斜) 期间合成和真实心血管变化记录中的噪声功率.
主要成果:
- 该方法准确地确定了合成时间序列中的噪声水平,即使窗口长度很短.
- 在姿势变化期间观察到显著的生理噪音时间分辨变化,与自主调节有关.
- 在直立姿势的最初60秒内,生理噪音增加 (交感活动),然后减少,而阴道活动显示出反向关系.
- HRV系列中较高的随机性 (噪声) 证实了偏差复杂性评估.
结论:
- 开发的方法提供了对心血管信号中的生理噪声动态的可靠估计.
- 姿势变化导致生理噪音的显著,时间变化的变化,反映了自主神经系统的反应.
- 准确地描述生理噪声对于精确的心血管信号分析至关重要,并且在评估自主功能方面具有潜在的临床应用.
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