Gil Eduardo, Orini Michele, Bailon Raquel, Vergara Jose Maria, Mainardi Luca, Laguna Pablo
Communications Technology Group, Aragóln Institute of Engineering Research, University of Zaragoza, Spain.
Annu Int Conf IEEE Eng Med Biol Soc. 2010;2010:3579-82. doi: 10.1109/IEMBS.2010.5627476.
In this work we assessed the possibility of using the pulse rate variability (PRV) extracted from photoplethysmography signal as an alternative measurement of the HRV signal in non-stationary conditions. The study is based on the analysis of the changes observed during tilt table test in the heart rate modulation of 17 young subjects. Time-varying spectral properties of both signals were compared by time-frequency (TF) and TF coherence analysis. In addition, the effect of replacing PRV with HRV in the assessment of the changes of the autonomic modulation of the heart rate was considered. Time-frequency analysis revealed that: the TF spectra of both signals were highly correlated (0.99 ± 0.01); the difference between the instantaneous power, in LF and HF bands, obtained from HRV and PRV was small (, 10(-3) s(-2)) and their temporal patterns were highly correlated (0.98 ± 0.04 and 0.95 ± 0.06 in LF and HF bands respectively); TF coherence in LF and HF bands was high (0.97 ± 0.04 and 0.89 ± 0.08, respectively). Finally, the instantaneous power in LF band was observed to significantly increase during head-up tilt by both HRV and PRV analysis. These results suggest that, although some small differences in the time-varying spectral indices extracted from HRV and PRV exist, mainly in the HF band associated with respiration, PRV could be used as an acceptable surrogate of HRV during non-stationary conditions, at least during tilt table test.
在本研究中，我们评估了在非平稳条件下，使用从光电容积脉搏波信号中提取的脉搏率变异性（PRV）作为心率变异性（HRV）信号替代测量指标的可能性。该研究基于对17名年轻受试者在倾斜试验期间心率调制变化的分析。通过时频（TF）和TF相干分析比较了两种信号的时变谱特性。此外，还考虑了在评估心率自主调制变化时用PRV替代HRV的效果。时频分析表明：两种信号的TF谱高度相关（0.99±0.01）；从HRV和PRV获得的低频（LF）和高频（HF）带的瞬时功率差异很小（<10⁻³ s⁻²），且它们的时间模式高度相关（LF和HF带分别为0.98±0.04和0.95±0.06）；LF和HF带的TF相干性很高（分别为0.97±0.04和0.89±0.08）。最后，通过HRV和PRV分析均观察到在头高位倾斜期间LF带的瞬时功率显著增加。这些结果表明，尽管从HRV和PRV提取的时变谱指数存在一些小差异，主要在与呼吸相关的HF带，但至少在倾斜试验期间，PRV可作为非平稳条件下HRV的可接受替代指标。
