Spectral analysis of pulse transit time variability and its coherence with other cardiovascular variabilities
Refereed conference paper presented and published in conference proceedings

香港中文大學研究人員

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摘要Pulse transit time (PTT) has been reported correlated with heart rate (HR) and blood pressure (BP), however, the results are not consistent in different investigations. Towards a better understanding of the underlying mechanisms of the PTT changes, this study compares the power spectrum density of the variability in PTT with that in FIR and BP under rest and post-exercise physiological conditions. Coherence function is also examined to quantify the strength of coupling between paired variabilities. The results show that the pulse transit time variability (PTTV) has significant coherence (>0.5) with heart rate variability (HRV) and blood pressure variability (BPV) under all physiological conditions at high frequency (HE). However, at the low frequency (LF) band, the coherence reduced to insignificance immediately after the exercise (<= 5 minutes after exercise) and then return back to significant level 9 minutes after the exercise. The results show that PTTV is strongly coupled with HRV and BPV at the HF, indicating that the parasympathetic modulation could be the main cause of PTTV. The unstable coupling relationship of PTTV with BPV at LF should raise caution in the beat-to-beat BP estimation by PTT in the dynamic situation.
著者Ma HT, Zhang YT
會議名稱28th Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society
會議開始日30.08.2006
會議完結日03.09.2006
會議地點New York
會議國家/地區美國
詳細描述organized by IEEE EMBS,
出版年份2006
月份1
日期1
出版社IEEE
頁次3958 - 3961
國際標準書號978-1-4244-0032-4
語言英式英語
Web of Science 學科類別Engineering; Engineering, Biomedical

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