Response of Autonomic Nervous System to Body Positions: Fourier and Wavelet Analysis

Details Response of Autonomic Nervous System to Body Positions: Fourier and Wavelet Analysis Response of Autonomic Nervous System to Body Positions: Fourier and Wavelet Analysis

2003-10-24

arxiv.org/abs/physics/0310125v3

Mod. Phys. Lett. B, Vol.19, Nos.1-2, (2005) 59-78

Physics

Biological Physics

RevTex,8 figures

Scientific paper

10.1142/S0217984905008025

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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