In this study we assessed the possibility of using the pulse rate variability (PRV) extracted from the photoplethys- mography 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. First, classical indices of HRV analysis were compared to indices from PRV in two– minute intervals where stationarity was assumed. Second, time– frequency (TF) analysis based on the Smooth Pseudo Wigner– Ville distribution was used to compare the time-varying spectral properties of both signals. Third, the effect of replacing HRV with PRV in the assessment of the changes of the autonomic modulation of the heart rate was considered. Classical time- invariant HRV and PRV indices were comparable, never statis- tically different (p >0.05) and highly correlated (>0.97 ). Time- frequency analysis revealed that: the TF spectra of both signals were highly correlated (0.990.01); the difference between the instantaneous power in LF and HF bands was small (<10 3 s 2 ( and their temporal patterns were highly correlated (0.980.04 and 0.950.06 in LF and HF bands, respectively). Finally, the instantaneous power in LF was observed to signicant increase during head-up tilting by both HRV and PRV analysis. These results support the use of the PRV analysis to assess the temporal pattern of the autonomic modulation of the heart rate, at least during tilt table test

Comparative analysis between PPG variability and HRV during non-stationary tilt table test

ORINI, MICHELE;
2010-01-01

Abstract

In this study we assessed the possibility of using the pulse rate variability (PRV) extracted from the photoplethys- mography 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. First, classical indices of HRV analysis were compared to indices from PRV in two– minute intervals where stationarity was assumed. Second, time– frequency (TF) analysis based on the Smooth Pseudo Wigner– Ville distribution was used to compare the time-varying spectral properties of both signals. Third, the effect of replacing HRV with PRV in the assessment of the changes of the autonomic modulation of the heart rate was considered. Classical time- invariant HRV and PRV indices were comparable, never statis- tically different (p >0.05) and highly correlated (>0.97 ). Time- frequency analysis revealed that: the TF spectra of both signals were highly correlated (0.990.01); the difference between the instantaneous power in LF and HF bands was small (<10 3 s 2 ( and their temporal patterns were highly correlated (0.980.04 and 0.950.06 in LF and HF bands, respectively). Finally, the instantaneous power in LF was observed to signicant increase during head-up tilting by both HRV and PRV analysis. These results support the use of the PRV analysis to assess the temporal pattern of the autonomic modulation of the heart rate, at least during tilt table test
2010
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/580280
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