dorsal/arxiv
View SchemaResponse of Autonomic Nervous System to Body Positions: Fourier and Wavelet Analysis
| Authors | Aiguo Xu, G. Gonnella, A. Federici, S. Stramaglia, F. Simone, A. Zenzola, R. Santostasi |
|---|---|
| Categories | |
| ArXiv ID | physics/0310125 |
| URL | https://arxiv.org/abs/physics/0310125 |
| DOI | 10.1142/S0217984905008025 |
| Journal | Mod. Phys. Lett. B, Vol.19, Nos.1-2, (2005) 59-78 |
Abstract
Two mathematical methods, the Fourier and wavelet transforms, were used to study the short term cardiovascular control system. Time series, picked from electrocardiogram and arterial blood pressure lasting 6 minutes, were analyzed in supine position (SUP), during the first (HD1), and the second parts (HD2) of $90^{\circ}$ head down tilt and during recovery (REC). The wavelet transform was performed using the Haar function of period $T=2^j$ ($% j=1$,2,$... $,6) to obtain wavelet coefficients. Power spectra components were analyzed within three bands, VLF (0.003-0.04), LF (0.04-0.15) and HF (0.15-0.4) with the frequency unit cycle/interval. Wavelet transform demonstrated a higher discrimination among all analyzed periods than the Fourier transform. For the Fourier analysis, the LF of R-R intervals and VLF of systolic blood pressure show more evident difference for different body positions. For the wavelet analysis, the systolic blood pressures show much more evident difference than the R-R intervals. This study suggests a difference in the response of the vessels and the heart to different body positions. The partial dissociation between VLF and LF results is a physiologically relevant finding of this work.
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"abstract": "Two mathematical methods, the Fourier and wavelet transforms, were used to\nstudy the short term cardiovascular control system. Time series, picked from\nelectrocardiogram and arterial blood pressure lasting 6 minutes, were analyzed\nin supine position (SUP), during the first (HD1), and the second parts (HD2) of\n$90^{\\circ}$ head down tilt and during recovery (REC). The wavelet transform\nwas performed using the Haar function of period $T=2^j$ ($% j=1$,2,$... $,6) to\nobtain wavelet coefficients. Power spectra components were analyzed within\nthree bands, VLF (0.003-0.04), LF (0.04-0.15) and HF (0.15-0.4) with the\nfrequency unit cycle/interval. Wavelet transform demonstrated a higher\ndiscrimination among all analyzed periods than the Fourier transform. For the\nFourier analysis, the LF of R-R intervals and VLF of systolic blood pressure\nshow more evident difference for different body positions. For the wavelet\nanalysis, the systolic blood pressures show much more evident difference than\nthe R-R intervals. This study suggests a difference in the response of the\nvessels and the heart to different body positions. The partial dissociation\nbetween VLF and LF results is a physiologically relevant finding of this work.",
"arxiv_id": "physics/0310125",
"authors": [
"Aiguo Xu",
"G. Gonnella",
"A. Federici",
"S. Stramaglia",
"F. Simone",
"A. Zenzola",
"R. Santostasi"
],
"categories": [
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],
"doi": "10.1142/S0217984905008025",
"journal_ref": "Mod. Phys. Lett. B, Vol.19, Nos.1-2, (2005) 59-78",
"title": "Response of Autonomic Nervous System to Body Positions: Fourier and Wavelet Analysis",
"url": "https://arxiv.org/abs/physics/0310125"
},
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