TY - GEN
T1 - The time-frequency analysis of variabilities of heart rate, systolic blood pressure and pulse transit time on normotensive subjects after exercise
AU - Liu, Q.
AU - Poon, C. C.Y.
AU - Wong, M. Y.M.
AU - Zhang, Y. T.
PY - 2009
Y1 - 2009
N2 - Spectral components of cardiovascular oscillations are related to complex autonomic control mechanisms. Since these oscillations are non-stationary, time-frequency (T-F) analysis has been used in studying cardiovascular oscillations such as variabilities of heart rate and blood pressure; however, few studies have extended the T-F analysis to other cardiovascular signals such as pulse transit time (PTT). In this preliminary study, a T-F analysis method based on a time-variant autoregressive model was used to study the beat to beat spectra of R-R interval (RRI) of electrocardiogram, systolic blood pressure (SBP) and PTT on 8 normotensive subjects after exercise. It is observed from the results that spectra of RRI, SBP and PTT comprised of two distinguished components in the 0.03-0.15 Hz and 0.18-0.4 Hz respectively and that the spectra of SBP and PTT were relatively similar compared to spectra of RRI. However, the beat to beat power spectral densities (PSD) of the signals were not the same all the time. Furthermore, a physiological mechanism-based model was proposed for the generation of ECG, BP and PPG signals, and to interpret the phenomena observed in experiments. Further investigation is needed to quantify this similarity and to study the inherent correlations and mechanisms mediating these cardiovascular oscillations.
AB - Spectral components of cardiovascular oscillations are related to complex autonomic control mechanisms. Since these oscillations are non-stationary, time-frequency (T-F) analysis has been used in studying cardiovascular oscillations such as variabilities of heart rate and blood pressure; however, few studies have extended the T-F analysis to other cardiovascular signals such as pulse transit time (PTT). In this preliminary study, a T-F analysis method based on a time-variant autoregressive model was used to study the beat to beat spectra of R-R interval (RRI) of electrocardiogram, systolic blood pressure (SBP) and PTT on 8 normotensive subjects after exercise. It is observed from the results that spectra of RRI, SBP and PTT comprised of two distinguished components in the 0.03-0.15 Hz and 0.18-0.4 Hz respectively and that the spectra of SBP and PTT were relatively similar compared to spectra of RRI. However, the beat to beat power spectral densities (PSD) of the signals were not the same all the time. Furthermore, a physiological mechanism-based model was proposed for the generation of ECG, BP and PPG signals, and to interpret the phenomena observed in experiments. Further investigation is needed to quantify this similarity and to study the inherent correlations and mechanisms mediating these cardiovascular oscillations.
KW - Cardiovascular oscillations
KW - Cuffless blood pressure estimation
KW - Time-variant spectra
UR - http://www.scopus.com/inward/record.url?scp=77949463793&partnerID=8YFLogxK
U2 - 10.1109/ISABEL.2009.5373709
DO - 10.1109/ISABEL.2009.5373709
M3 - Conference Proceeding
AN - SCOPUS:77949463793
SN - 9781424446414
T3 - 2nd International Symposium on Applied Sciences in Biomedical and Communication Technologies, ISABEL 2009
BT - 2nd International Symposium on Applied Sciences in Biomedical and Communication Technologies, ISABEL 2009
T2 - 2nd International Symposium on Applied Sciences in Biomedical and Communication Technologies, ISABEL 2009
Y2 - 24 November 2009 through 27 November 2009
ER -